Audi Q7 2007 Operating instructions

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Repair Manual
Audi Q7 2007 ➤
Brake System
Engine ID BAR BHK CAT
A
CJW
C
CJW
B
CJW
E
CNR
B
CTW
B
CTW
A
Edition 03.2018
Service
Service Department. Technical Information

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
List of Workshop Manual Repair Groups
Repair Group
00 - General, Technical Data
45 - Antilock Brake System
46 - Mechanical Components
47 - Hydraulic Components
Technical information should always be available to the foremen and mechanics, because their
careful and constant adherence to the instructions is essential to ensure vehicle road-worthiness and
safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a
matter of course, be observed.
Service
All rights reserved.
No reproduction without prior agreement from publisher.
Copyright © 2018 Audi AG, Ingolstadt D3E80022530

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Contents
00 - General, Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Brake Allocation of PR Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Sample Vehicle Data Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Brakes, Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Ceramic Brake Rotor, Evaluating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Evaluating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Visual Characteristics of Ceramic Brake Rotors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Surface Cracks in Cooling Duct Crosspieces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Cracks in Ceramic Brake Rotor Connection Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Chamfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.6 Nicks on Ceramic Brake Rotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.7 Crack in Cooling Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Ceramic Brake Rotor, Determining Wear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Determining Wear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Brake Rotor Thickness, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 Brake Rotor Thickness, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4 Wear Indicators, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.5 Brake Rotor, Weighing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.6 Ceramic Brake Rotor, Determining Wear using Carbon-Ceramic Brake Wear Tester
VAS6813 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 Brakes Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2 Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
45 - Antilock Brake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1.1 Antilock Brake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1.2 Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2 Vehicle Diagnostic Tester , Connecting and Selection Functions . . . . . . . . . . . . . . . . . . . . 28
3 ABS Brake System, Components and Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4 Hydraulic Unit and Brake Booster/Brake Master Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.2 ABS Control Module J104 with Hydraulic Unit, Removing and Installing . . . . . . . . . . . . . . 34
5 ABS Components on Front and Rear Axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.1 Front Axle, Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2 Speed Sensor on the Front Axle, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . 38
5.3 Rear Axle, Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.4 Speed Sensor on Rear Axle, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6 Electronic Stabilization Program Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.1 ESP Sensor Unit G419 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.2 Steering Angle Sensor G85 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7 Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
46 - Mechanical Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
1 Front Brakes (PR - 1LF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
1.1 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
1.2 Brake Pads, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
1.3 Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
2 Front Brakes (PR- 1LT and 1LU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Audi Q7 2007 ➤
Brake System - Edition 03.2018
Contents i

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
2.2 Brake Pads, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
2.3 Front Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2.4 Front Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
3 Front Brakes (PR- 1LW and 1LN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
3.2 Front Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
3.3 Front Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
3.4 Front Brake Pads, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
3.5 Front Brake Rotor, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
3.6 Front Brake Rotor, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4 Rear Brakes (PR 1KF and 2EA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4.2 Brake Rotor, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
4.3 Brake Pads, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.4 Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
5 Rear Brakes (PR- 1KD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
5.2 Brake Rotor, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.3 Brake Pads, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
5.4 Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
5.5 Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
6 Rear Brakes (PR 2 EF and 1KK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.2 Brake Rotor, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
6.3 Brake Rotor, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
6.4 Brake Pads, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
6.5 Brakes Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
6.6 Brake Caliper, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
7 Brake Shoes, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
8 Parking Brake (Basic Setting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
9 Free Play of Foot Operated Parking Brake, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
10 Brake Shoes, Running-In on Brake Test Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
11 Brake Shoes, Burnishing on a Blocked Off Street . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
12 Pedal Parking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
12.1 Pedal Parking Brake Lever Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
12.2 Pedal Parking Brake Lever, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
12.3 Foot Operated Parking Brake Gas-Filled Strut, Removing and Installing . . . . . . . . . . . . . . 116
12.4 Transfer Module Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
13 Brake Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
13.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
13.2 Rear Brake Cables, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
13.3 Brake Cable, Disengaging from Spreader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
13.4 Front Brake Cable, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
14 Brake Pedal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
14.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
14.2 Brake Pedal, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
14.3 Brake Light Switch (Old Generation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
14.4 Brake Light Switch (New Generation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
14.5 Brake Pedal and Brake Booster, Separating and Connecting . . . . . . . . . . . . . . . . . . . . . . 127
14.6 Brake Pedal, Attaching to Brake Booster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
14.7 Mount, Removing and Installing, Brake Booster Push Rod . . . . . . . . . . . . . . . . . . . . . . . . 128
15 Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
47 - Hydraulic Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Audi Q7 2007 ➤
Brake System - Edition 03.2018
ii Contents

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
1 Brake Caliper (PR - 1LT and 1LU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
1.2 Brake Caliper Piston, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
2 Brake Caliper (PR - 1LF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
2.2 Brake Caliper Piston, Removing and Installing, PR- 1LF . . . . . . . . . . . . . . . . . . . . . . . . . . 137
3 Brake Caliper (PR- 1LW and 1LN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
3.2 Front Ceramic Brake Caliper Piston, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . 140
4 Rear Brake Caliper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
4.2 Rear Brake Caliper, Removing and Installing, all Models . . . . . . . . . . . . . . . . . . . . . . . . . . 144
5 Pressure Leak Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
6 Brake System, Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
6.1 Brake System, Bleeding with Brake Charger/Bleed Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 147
6.2 Pre-Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
6.3 Hydraulic System, Bleeding without Brake Charger/Bleeder Unit . . . . . . . . . . . . . . . . . . . . 149
6.4 Brake Fluid, Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
7 Brake Booster/Master Brake Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
7.2 Brake Master Cylinder, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
7.3 Brake Booster, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
7.4 Brake Booster Push Rod Mount, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . 156
8 Brake Booster Vacuum Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
8.1 Vacuum Pump, Diesel, Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
8.2 Overview - Vacuum Pump, Vehicles with 3.0L TFSI Engine . . . . . . . . . . . . . . . . . . . . . . . . 160
8.3 Vacuum Pump, 4.2L Diesel, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
8.4 Vacuum Pump, Removing and Installing, 3.0L TDI Engine . . . . . . . . . . . . . . . . . . . . . . . . 163
8.5 Vacuum Pump, Removing and Installing, 12 Cylinder TDI Engine . . . . . . . . . . . . . . . . . . 164
8.6 Vacuum Pump, Removing and Installing, 3.0L TFSI Engine . . . . . . . . . . . . . . . . . . . . . . . . 165
9 Electrical Brake System Vacuum Pump V192 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
9.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
9.2 Brake System Vacuum Pump V192 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . 167
9.3 Brake Booster Pressure Sensor G294 , Removing and Installing . . . . . . . . . . . . . . . . . . . . 168
9.4 Check Valve, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
10 Brake Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
10.1 Repairing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
10.2 Flaring Tool Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
10.3 Flaring Tool Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
11 Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
12 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Audi Q7 2007 ➤
Brake System - Edition 03.2018
Contents iii

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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
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Audi Q7 2007 ➤
Brake System - Edition 03.2018
iv Contents

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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
00 – General, Technical Data
1 Brake Allocation of PR Codes
(Edition 03.2018)
⇒ “1.1 General Information”, page 1
⇒ “1.2 Sample Vehicle Data Label”, page 1
⇒ “1.3 Brakes, Specifications”, page 1
1.1 General Information
The ABS brake system is divided diagonally (two circuits). The
brake booster is pneumatically controlled by the vacuum brake
booster.
The brake system installed in a vehicle is documented on the ve‐
hicle data sticker via the relevant PR number.
1.2 Sample Vehicle Data Label
The following brakes are installed in this example:
♦ Arrow -A- model.
♦ Arrow -B- front brakes -1LF.
♦ Arrow -C- rear brakes - 1KF.
The vehicle data label can be found in the spare wheel well as
well as in the Maintenance booklet.
The following table shows the meaning of the PR numbers. These
are important for combination brake caliper/brake disc/brake
drum and brake pad.
♦ Allocation. Refer to the Parts Catalog.
1.3 Brakes, Specifications
Note
♦ Hairline cracks on brake rotor friction surfaces are often ob‐
served during brake repairs. Hairline cracks up to 10 mm long
are not a technical flaw and are not cause for brake rotor re‐
placement.
♦ Brake rotors with friction surfaces that have worn through
should be replaced.
Front Brakes, 18" Brembo
Production Number.
PR-Nr
1LF
Brake caliper Brembo 18“
Brake pad, thickness,
without backing plate
mm 11
Brake pad, wear limit
without back plate
mm 2
Brake rotor di‐
ame‐
ter in
mm
350 mm
Brake rotor, thickness mm 34
Audi Q7 2007 ➤
Brake System - Edition 03.2018
1. Brake Allocation of PR Codes 1

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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Front Brakes, 18" Brembo
Brake rotor, wear limit mm 32
Brake caliper, 6 pis‐
tons
di‐
ame‐
ter in
mm
every 2 x 30/ 34/ 38 mm
Note
♦ Maximum lateral run-out of steel brake rotor = 0.06 mm
♦ Measurement in installed brake rotor
♦ Use Dial Indicator Bracket - VAS 6079/1; Dial Indicator -
0-10mm - VAS 6079.
♦ Clean dirt and rust off the brake rotor.
♦ Measure 10 mm away from the outer edge of the brake rotor.
⇒ “1 Front Brakes (PR - 1LF)”, page 44
Note
♦ Hairline cracks on brake rotor friction surfaces are often ob‐
served during brake repairs. Hairline cracks up to 10 mm long
are not a technical flaw and are not cause for brake rotor re‐
placement.
♦ Brake rotors with friction surfaces that have worn through
should be replaced.
Brembo Front Brakes (18 Inch Plus)
Production Number.
PR-Nr
1LT
Brake caliper Brembo 18“ Plus
Brake pad, thickness,
without backing plate
mm 11
Brake pad, wear limit
without back plate
mm 2
Brake rotor di‐
ame‐
ter in
mm
368 mm
Brake rotor, thickness mm 36
Brake rotor, wear limit mm 34
Brake caliper, 6 pis‐
tons
di‐
ame‐
ter in
mm
each 36 mm
Audi Q7 2007 ➤
Brake System - Edition 03.2018
2 Rep. Gr.00 - General, Technical Data

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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Note
♦ Maximum lateral run-out of steel brake rotor = 0.06 mm
♦ Measurement in installed brake rotor
♦ Use Dial Indicator Bracket - VAS 6079/1; Dial Indicator -
0-10mm - VAS 6079.
♦ Clean dirt and rust off the brake rotor.
♦ Measure 10 mm away from the outer edge of the brake rotor.
⇒ “2 Front Brakes (PR- 1LT and 1LU)”, page 50
Note
♦ Hairline cracks on brake rotor friction surfaces are often ob‐
served during brake repairs. Hairline cracks up to 10 mm long
are not a technical flaw and are not cause for brake rotor re‐
placement.
♦ Brake rotors with friction surfaces that have worn through
should be replaced.
Ceramic Front Brakes
Production-relevant
number (PR number)
1LN / 1LW
Brake caliper Alcon 8K (20”)
Brake rotor ventilated di‐
ame‐
ter
mm
420
Brake rotor, thickness mm 40
Brake rotor, wear limit The wear value is the minimum
brake disc thickness during man‐
ufacturing and is stamped into
the brake disc cup.
Brake caliper, 8 pis‐
tons
di‐
ame‐
ter
mm
8 x diameter 30,2
Brake pad thickness
with backing plate
mm 20
Brake pad wear limit
with backing plate
mm 10
⇒ “3 Front Brakes (PR- 1LW and 1LN)”, page 59
Note
Hairline cracks on the friction surface on ceramic brakes occur
during the manufacturing process and can be found on new
brakes in different stampings. Hairline cracks on the friction sur‐
faces are not a reason to exchange the ceramic brake rotors.
Rear Brakes (Disc Brakes 17" and 18")
Production Number.
PR-Nr
1KF 2EA
Audi Q7 2007 ➤
Brake System - Edition 03.2018
1. Brake Allocation of PR Codes 3

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Rear Brakes (Disc Brakes 17" and 18")
Brake caliper Brembo (17") Brembo
(18")
Brake pad, thickness mm 11 11
Brake pad, wear limit
without back plate
mm 2 2
Brake rotor di‐
ame‐
ter in
mm
330 358
Brake rotor, thickness mm 28 28
Brake rotor, wear limit mm 26 26
Brake caliper, 4 pis‐
tons
di‐
ame‐
ter
mm
each 2 x 28/ 30 each 30
Note
♦ Maximum lateral run-out of steel brake rotor = 0.06 mm
♦ Measurement in installed brake rotor
♦ Use Dial Indicator Bracket - VAS 6079/1; Dial Indicator -
0-10mm - VAS 6079.
♦ Clean dirt and rust off the brake rotor.
♦ Measure 10 mm away from the outer edge of the brake rotor.
⇒ “4 Rear Brakes (PR 1KF and 2EA)”, page 75
Rear Wheel Brake, (Disc Brake 18" Plus)
Production Number.
PR-Nr
1KD
Brake caliper Brembo (18")
Brake pad, thickness mm 11
Brake pad, wear limit
without back plate
mm 2
Brake rotor di‐
ame‐
ter in
mm
358
Brake rotor, thickness mm 28
Brake rotor, wear limit mm 26
Brake caliper, 4 pis‐
tons
di‐
ame‐
ter in
mm
each 30
Audi Q7 2007 ➤
Brake System - Edition 03.2018
4 Rep. Gr.00 - General, Technical Data