Brake Pad: Service and Repair
Removing And Installing Brake Pads On Fixed Caliper
Remove/Install
Danger:
- Risk of poisoning from swallowing brake fluid. Risk of injury from skin and eye contact with brake fluid.
- Pour brake fluid only into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling
brake fluid.
CAUTION:
- See Notes on brake fluid
- See Notes on repairs to brake system
1 Remove wheels
Inspecting
2 Check lining thickness of brake pads and condition of brake disks
NOTE:
- If the brake pads are worn down beyond the permissible wear limit, the web between sealing groove and dust cap may be damaged:
- Inspect brake system for leaks with pressure tester.
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2000 Mercedes Benz Truck ML 55 AMG (163.174) V8-5.5L (113.981)
3 Check fixed caliper (31 a, 31 b) for leaks and dust seal for damage
NOTE:
- If the fixed caliper is leaking or the dust seal is damaged:
- Replace fixed caliper on front axle. - Replace fixed caliper on rear axle.
Remove/Install
4.1 Unplug brake pad contact sensor connector (1) from plug connection and brake pad.
- If installed.
NOTE: Installation: Defective contact sensors must be replaced.
CAUTION: See Notes on installing contact sensor for brake lining wear indicator
5 Drive out retaining pins (41) using a suitable drift punch (035)
NOTE: Installation: Drive in retaining pins as far as the stop using a suitable drift. Loose retaining pins must be replaced.
6 Remove retaining spring (41 b)
7 Pull brake pads (43) out of fixed caliper (31 a or 31 b)
NOTE:
- When pressing out the brake pads, insert a suitable wooden or plastic wedge between the lever and the fixed caliper. - Installation: Brake pads (43) with micro panel (43b) must be lubricated before installation: Molykote Cu-7439 brake pad paste - Brake pads are to be disposed of as special waste. Please ask local authorities if it is permitted to dispose of these parts as household-like
industrial refuse.
- Only brake pad kits approved by Mercedes Benz must be installed.
- If necessary, use the lever (034) to press out the brake pads if they are stuck
8 Press back piston using resetting device (031)
CAUTION: Draw off some brake fluid beforehand if necessary to prevent the brake fluid overflowing when pressing back the piston.
NOTE: On 4-piston fixed calipers on the front axle, secure one pair of upper and lower pistons with plastic wedges to prevent them from sliding out. Then press back the other pair of pistons using the resetting device.
- If the piston is difficult to move: - Replace fixed caliper on front axle. - Replace fixed caliper on rear axle.
9 Clean brake pad guides
NOTE: Do not use sharp or pointed implements to clean.
10 Install in the reverse order
Danger:
- Risk of accident when commissioning the vehicle due to a lack of braking effect when the service brake is operated for the first
time after repair work.
- Before commissioning the vehicle, operate the brake pedal several times until the pressure in the brake system is built up and
maintained.
11 Operate brake pedal several times until brake pads make contact with brake disks (firm resistance can be felt). 12 Check brake fluid in brake fluid reservoir and correct if necessary
NOTE: Fill brake fluid to max. mark on brake fluid reservoir, suction off.
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