Front

Replacing Front Disk Brake Pads


Note: After completing work:
^ Fully depress brake pedal several times so that brake linings contact brake disks.
^ When installing new brake linings at front and rear axles, brake fluid level must be brought up to "MAX" marking.
^ Hold ignition key for at least 30 seconds in position "1" without starting engine. This clears a fault entry in the RAM. This prevents the brake wear indicator lamp from lighting up again.

Remove wheels.
Lift out retaining spring (1).





Left:
Disconnect plug connection for brake lining wear indicator.





Remove plastic plugs (2).
Lift brake hose out of bracket.

Installation:
Make sure the brake hose is positively attached in the mounting fixture!





Release guide screws (1) with special tool 34 1 080
Withdraw brake caliper backwards.

Installation:
Only clean guide screws; do not grease.
Check threads.
Replace all guide screws, which are not in perfect condition.
Tightening torque, refer to Specifications.





Turn piston fully back with special tool 34 1 050

Caution: When forcing piston back:

^ Pay attention to brake fluid level in expansion tank; brake fluid that spills over will damage paint work.





Remove outer brake lining.
Inner brake lining is located with its spring in the piston.

Caution: Mark any worn brake linings.

In the event of one-sided brake lining wear, do not change brake linings round. New brake linings may only be installed if the brake disk thickness is greater than or equal to the minimum thickness (MIN TH), refer to Specifications.
Note minimum thickness of brake linings, refer to Specifications.
Clean brake linings. Do not apply grease to brake lining back plate.





Check dust sleeve (1) for damage and replace if necessary.
Clean contact face (2) of brake piston and apply a thin coating of suitable anti-squeak compound.

Caution: Dust sleeve must not come into contact with anti-squeak compound as this would cause dust sleeve to swell.





Clean contact faces (1...2) of brake lining hammer heads/brake caliper housing and coat with suitable anti-squeak compound.

Note: Grease contact surfaces on brake caliper at top and bottom.





Clean contact face (3) of brake caliper and apply a thin coating of suitable anti-squeak compound.





Clean contact face of brake caliper mounting bracket and apply a thin coating of suitable anti-squeak compound.





Left side
Installation:
The piston-side brake linings are directional.
Install brake lining with identification mark "L" on left vehicle side.





Right side
Installation:
The piston-side brake linings are directional.
Install brake lining with identification mark "R" on right vehicle side.