Remove/install brake pad on floating brake caliper

AR42.10-P-0160GH

Remove/install brake pad on floating brake caliper

7.2.08

 

Remove/install

 Danger!

Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes.

Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.

AS42.50-Z-0001-01A

 Danger!

Risk of injury to skin and eyes caused by handling hot or glowing objects.

Wear safety gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A



Brake fluid notes

AH42.50-P-0001-01A



Notes on repairs to brake system

AH42.00-P-0003-01A



Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

1

Unscrew the cap on the brake fluid expansion reservoir and suction off some brake fluid

 In order to prevent the expansion reservoir overflowing when pressing back the pistons.

2

Remove wheels



Remove/install wheels, rotate if necessary

AP40.10-P-4050GH



Checking

3

Check brake pad thickness and brake disks

 Replace brake pads (31g) and brake disks in complete sets if necessary.



Inspect condition of brake disks

AP42.10-P-4258GH



Check brake lining thickness

 If the brake pads (31g) have worn down to beyond the wear limit, the bar between the sealing groove and dust cap may be damaged; therefore: 

AP42.10-P-4253GH

Inspect brake system for leaks with pressure tester.

AR42.10-P-0015GH

4

Check floating caliper (31a, 31b) for leaks and dust seal (47) for damage

 Visual inspection, if necessary: 

Repair floating caliper

AR42.10-P-0153GH

5

Remove brake pad contact sensor

 Installation: Replace defective brake pad contact sensor.



Notes on installing brake pad wear sensor contact sensors

AH42.10-P-0003-01A

6

Remove guide pins (31c) or bolts (35)

 Installation: Replace guide pins (31c) or bolts (35).



*BA42.10-P-1003-10E



*BA42.10-P-1002-12E

7

Remove floating caliper (31a, 31b) with brake pads (31g) and fasten to one side

 Front axle: Swivel floating caliper (31a) upwards (arrow) and remove.

Rear axle: Swivel floating caliper (31b) downwards (arrow) and remove.

 Do not tension or kink brake hose. To relieve the load on the brake hose, attach the floating brake caliper (31a, 31b) to the vehicle so that it is free of tension, otherwise the brake hose will be damaged.

8

Remove brake pads (31g)

 Installation: Observe installation position, the brake pads (31g) are different:
Insert inner brake pad (31g) with spring riveted on into piston, insert outer brake pad (31g) into floating caliper (31a, 31b) and install floating caliper (31a, 31b).

 Installation: Only the brake pads (31g) approved by Mercedes-Benz may be built-in as a set.

 Brake pads (31g) are to be disposed of as special waste. The local authorities can provide information regarding whether disposal is also permitted as industrial waste similar to domestic waste.

9

Press back piston using pusher tool (031)

 If the brake pads (31g) for several brake calipers are removed, their pistons must be secured beforehand using wedges against falling out. If the piston is difficult to move: 

Repair floating brake caliper

AR42.10-P-0153GH



*000589524300



Clean

10

Clean bearing surface of brake pads (31g) in floating calipers (31a, 31b)



*000589266800

11

Replace slide rails (31e)

12

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 starting engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system.

AS42.50-Z-0002-01A

13

Operate the brake pedal several times until the brake pads (31g) contact the brake disks

 Firm resistance should be noticeable at the brake pedal.

14

Check brake fluid level, correct if necessary



Brake system - inspect fluid level

AP42.10-P-4210Z

Number

Designation

Model
163

BA42.10-P-1003-10E

Guide pin on caliper support

Nm

30

Number

Designation

Model 163

BA42.10-P-1002-12E

Self-locking bolt of floating caliper to wheel carrier

Nm

23