AR42.10-P-1600BM Remove/Install Brake Pad on Floating Brake Caliper

Checking
1. Check lining thickness of brake pads and condition of brake discs.
- If the brake pads have worn beyond the permissible wear limit, the land between the sealing groove and dust cap may be damaged, therefore, check brake system for leaks using pressure tester, refer to Leak Test. Testing and Inspection

Removal
2. Unhook spring (31d).
- Pull left front brake pad wear sensor (S10/1) out of front brake pad wear sensor connector (S10/1x1).
3. Pull covers (31 b) off guide pins.
4. Unscrew guide pins (31c).
5. Remove floating caliper (31 a) with brake pads (31g).
- Brake pads must be disposed of as hazardous waste.
- Local authorities can provide information as to whether the brake pads may also be disposed of as industrial waste similar to domestic waste.
6. Pull left front brake pad wear sensor (S10/ 1) out of lining back plate of brake pad (31g).
7. Check floating caliper (31a) for leaks and check dust boot is not damaged.
- Perform visual inspection, if necessary, repair floating caliper, refer to Overhaul. Service and Repair
8. Press back piston (47) with resetting device (031).
- Extract some brake fluid beforehand to prevent the brake fluid reservoir overflowing when the piston (47) is pushed back.
- If piston is difficult to move, repair front axle floating caliper, refer to Overhaul. Service and Repair
9. Clean bearing surface of brake pads (31g) in brake carrier (33) and floating caliper (31a).

Installation
10. Install in reverse order, noting the following:
- Only sets of brake pads approved by Mercedes-Benz must be installed.
- Insert inner brake pad (31g) with riveted-on spring (arrow) in piston.
- Insert outer brake pad in brake carrier (33) and install floating caliper (31a).
- Replace defective front brake pad wear sensors (S10/1).
- Always install front brake pad wear sensor (S10/1) on inner brake pad.
- Tighten guide pin to: 25 Nm

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 the brake pedal several times until the brake pads contact the brake discs (firm resistance detectable).

DANGER:
^ Risk of poisoning due to consuming brake fluid.
^ Risk of injury due to brake fluid coming into contact with the skin and eyes.
^ Only pour brake fluid into suitable appropriately marked containers.
^ Wear protective clothing and safety glasses when handling brake fluid.

12. Check brake fluid in brake fluid reservoir and correct if necessary.
- Top up or extract brake fluid up to the max. mark on brake fluid reservoir.

NOTE:
^ Refer to Notes On Brake Fluid.
^ Refer to Notes on Test and Repair Work to brake system.