Mercedes-Benz A W168 User manual

How to replace the front brake hose
on MERCEDES-BENZ A W168
VIDEO TUTORIAL
This replacement procedure can be used for:
MERCEDES-BENZ A-CLASS (W168) A 140 (168.031, 168.131), MERCEDES-BENZ
A-CLASS (W168) A 160 (168.033, 168.133)
The steps may slightly vary depending on the car design.
WWW.AUTODOC.CO.UK 1–24
Important!

REQUIRED TOOLS:
WWW.AUTODOC.CO.UK 2–24
Wire brush
WD-40 spray
Brake cleaner
Copper grease
Combination spanner #11
Combination spanner #14
Wheel impact socket #17
Torque wrench
Fluid container
Brake bleeder kit
Wheel chock

AUTODOC recommends:
CARRY OUT REPLACEMENT IN THE FOLLOWING ORDER:
1
Open the bonnet. Unscrew the brake fluid reservoir cap.
WWW.AUTODOC.CO.UK 3–24
The replacement procedure is identical for the right and left brake
hoses on the same axle.
All work should be done with the engine stopped.

2
Secure the wheels with chocks.
3
Loosen the wheel mounting bolts. Use wheel impact socket #17.
WWW.AUTODOC.CO.UK 4–24

4
Raise the front of the car and secure on supports.
5
Unscrew the wheel bolts.
AUTODOC recommends:
WWW.AUTODOC.CO.UK 5–24
To avoid injury, hold up the wheel when unscrewing the bolts.

6
Remove the wheel.
7.1
Clean the area where the brake hose is connected to the brake caliper and to the brake
circuit pipe.
WWW.AUTODOC.CO.UK 6–24

7.2
Use a wire brush. Use WD-40 spray.
8
Detach the fastener connecting the ABS sensor cable to the shock strut.
WWW.AUTODOC.CO.UK 7–24

9
Put a container for gathering brake fluid beneath.
10
Unscrew the fastener connecting the brake hose to the brake circuit pipe. Use a combination
spanner #11.
WWW.AUTODOC.CO.UK 8–24

11
Unscrew the brake hose from the brake caliper. Use a combination spanner #14.
12
Remove the brake hose.
WWW.AUTODOC.CO.UK 9–24

13
Screw the new brake hose onto the brake caliper.
14
Tighten the fastener connecting the brake pipe to the brake caliper. Use a combination
spanner #14. Use a torque wrench. Tighten it to 26 Nm torque.
WWW.AUTODOC.CO.UK 10–24

15
Screw the brake hose onto the brake circuit pipe. Use a combination spanner #11. Use a
torque wrench. Tighten it to 22 Nm torque.
16
Clean the area where the brake hose is connected to the brake caliper and to the brake
circuit pipe. Use a brake cleaner.
AUTODOC recommends:
WWW.AUTODOC.CO.UK 11–24
After applying the spray, wait a few minutes.

17
Connect the fastener of the ABS sensor cable to the shock absorber strut.
18
Undo the brake bleeder screw. Use a combination spanner #11.
WWW.AUTODOC.CO.UK 12–24

19
Connect the brake bleeder kit to the brake bleeder screw.
20
Press the brake pedal several times to remove any air from the system.
WWW.AUTODOC.CO.UK 13–24

21
Tighten the brake bleeder screw. Use a combination spanner #11.
22
Clean dirt from the brake hose bolt. Use a brake cleaner.
AUTODOC recommends:
WWW.AUTODOC.CO.UK 14–24
After applying the spray, wait a few minutes.

23
Disconnect the brake bleeder kit.
24
Clean the brake disk surface. Use a wire brush. Treat the surface where the brake disc
contacts the wheel rim. Use copper grease.
WWW.AUTODOC.CO.UK 15–24

25
Install the wheel.
AUTODOC recommends:
26
Screw in the wheel bolts. Use wheel impact socket #17.
WWW.AUTODOC.CO.UK 16–24
To avoid injury, hold up the wheel when screwing in the fastening
bolts.

27
Check the brake fluid level in the expansion tank and refill if necessary.
28
Tighten the brake fluid reservoir cap.
WWW.AUTODOC.CO.UK 17–24

29
Lower the car and working in a cross order, tighten the wheel bolts. Use a torque wrench.
Tighten it to 112 Nm torque.
30
Remove the jacks and chocks.
WWW.AUTODOC.CO.UK 18–24

31
Close the hood.
WWW.AUTODOC.CO.UK 19–24

DID YOU FIND THESE INSTRUCTIONS
HELPFUL?
YES NO
BECOME A MEMBER OF AUTODOC CLUB!
WWW.AUTODOC.CO.UK 20–24