Removing, checking and installing rear axle brake pads

AR42.10-S-1700A

Removing, checking and installing rear axle brake pads

11.3.10

6.7.01

Safety information and special tool updated



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



Brake fluid notes

All models

AH42.50-P-0001-01A



Notes on repairs to brake system

All models

AH42.00-P-0003-01A



For safety reasons all the brake pads on the axle should be replaced at the same time.

1

Switch vehicle to service mode.

 With code CL0 (air suspension)

2

Unscrew cap on brake fluid reservoir.

3

Remove rear road wheels.

AR40.10-S-1100A

4

Pull locking cotter pin (5) off the guide pins (4)

5

Drive guide pins (4) out of the brake caliper (1)

 Installation: Lubricate guide pins (4) lightly with silicone grease.

Silicone grease

*BR00.45-Z-1019-06A

6

Remove retaining spring (3)

 Observe installation position of retaining spring (3).

7

Disconnect brake lining wear indicator sensor (9) at plug connection.

8

Remove brake pads (2) from rear axle

 Installation: The brake pad (2) with the brake lining wear indicator sensor (9) is installed on the inside. Rub in a thin film of brake pad paste at the side guides and piston contact surfaces of the carrier plate of the brake pads.

Brake pad paste

*BR00.45-Z-1003-06A

9

Reset brake caliper piston.

 In order to prevent damage to the dust boot when installing the brake pads (4), it is absolutely essential to ensure that after resetting the brake caliper piston the dust boot is folded in completely and does not project anywhere.

 The brake fluid is guided back to the brake fluid reservoir by resetting the brake caliper piston. Make arrangements to collect any brake fluid which escapes from the reservoir.

 Pusher tool

*000589524300

10

Clean brake parts and check for wear and damage

 If brake parts are undersize install new parts.

Rear axle brake disks

*BE42.10-N-1001-09B

Brake lining wear limit

*BE42.10-N-1001-10A

 Brake caliper brush

*000589266800

 Caliper gauge

*124589051900

11

Install in the reverse order

12

Build up brake pressure

 Depress brake pedal several times.



Checking

13

Check brake fluid level in reservoir and correct if necessary



AP42.50-D-4210A

14

Check brake system for leaks

Number

Designation

Model
638

BE42.10-N-1001-09B

Brake disk thickness

New

mm

10

Wear limit

mm

8

Max. lateral runout

mm

-

Max. axial runout

mm

-

Repair limit dimension

mm

-

Number

Designation

Model 638

BE42.10-N-1001-10A

Brake lining wear limit

mm

3

Number

Designation

Order number

BR00.45-Z-1003-06A

Brake pad paste replaced by: A 001 989 94 51

A 001 989 10 51

BR00.45-Z-1019-06A

ABS sensor grease

A 000 989 62 51 10