Remove/check/install rear axle brake pads

AR42.10-S-1710P

Remove/check/install rear axle brake pads

06.03.2020

Model

470, 471

Shown on model 470, on left side of vehicle

1

Bolts

4

Brake linings

2

Brake caliper

5

Bracket

3

Caliper support

6

Brake disk

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

AS42.50-Z-0002-01A

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

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

AS00.00-Z-0002-01A

 Warning

Risk of injury. Moving parts can pinch, crush or, in extreme cases even sever extremities.

No parts of the body or limbs should be within the operating area of mechanical components when moving components.

AS00.00-Z-0009-01A

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

 Caution

Risk of poisoning from swallowing brake fluid. Risk of injury from skin and eye contact with brake fluid

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

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

Brake fluid notes

AH42.50-P-0001-01A

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A



Remove

1

Clean the area around the cap of the brake fluid reservoir

Assembly cleaner

*BR00.45-Z-1028-04A

2

Remove cap from brake fluid reservoir and extract some brake fluid

 Commercially available devices/tools
Extraction bellows

 This prevents the brake fluid reservoir overflowing when the brake piston is pushed back.

3

Remove rear road wheels

AR40.10-S-1100P

4

Remove screw/bolt (1)

5

Remove brake caliper (2) with attached brake hose from brake caliper support (3) and secure it against falling down

6

Remove outer and inner brake pad (4)

 Dispose of brake pads (4) as special waste. The local authorities can provide information regarding whether disposal is also permitted as industrial waste similar to domestic waste.

7

Remove holders (5) from brake caliper support (3)

AR42.10-S-1040-05P

Assembly cleaner

*BR00.45-Z-1028-04A



Check

8

Check outer and inner brake pad (4) for damage and wear



AP42.10-S-4252P

If the brake pads (4) are to be reused



Clean contact surfaces on carrier plates of brake pads (4).

Assembly cleaner

*BR00.45-Z-1028-04A

If a brake pad (4) is damaged or worn.



Replace all brake pads (4) on rear axle.

9

Check brake disk (6) for damage and wear



AP42.10-S-4256P

If a problem arises



Replace left and right brake disk (6) and all brake pads (4) on rear axle.

AR42.10-S-0240P

10

Check brake caliper (2) for damage and leakage

If the brake caliper (2) is damaged or leaky or if the boots of the brake pistons are damaged.



Replace brake caliper (2).

AR42.10-S-0080P

11

Check boots, guide pins and pilot bushings of brake caliper guide for damage

AR42.10-S-0140-03P

If a problem arises



replace brake caliper support (3).

AR42.10-S-0080P

12

Turn back brake piston and check it for ease of movement while doing so

 Resetting device

*000589524300

If the brake piston is sluggish.



Replace brake caliper (2).

AR42.10-S-0080P



Install

13

Install holders (5) into brake caliper support (3)

AR42.10-S-1040-05P

MB brake paste Molykote (copper colored)

*BR00.45-Z-1057-06A

14

Install inner and outer brake pad (4) into holders (5) on brake caliper support (3)

15

Release brake caliper (2), position on brake caliper support (3) and tighten using bolts (1)

 Screw/bolt, brake caliper to brake caliper support

*BA42.10-N-1003-12P

16

Operate brake pedal several times until brake pads (4) make contact with brake disks (6)

 Firm resistance should be noticeable at the brake pedal.

17

Fit rear wheels

AR40.10-S-1100P



Check

18

Check fill level in brake fluid reservoir and correct if necessary



Brake fluids (DOT 4 plus)

BB00.40-P-0331-00A



AP42.10-S-4210P

 Commercially available devices/tools
Extraction bellows

19

Fit cap onto brake fluid reservoir

20

Perform brake test

Notes on the evaluating and interpreting brake tests on test stands

AH42.00-N-0004-01S



AP42.00-S-4290P

 Rear axle brake caliper

Number

Designation

Model 470, 471

BA42.10-N-1003-12P

Screw/bolt, brake caliper to brake caliper support

Nm

32

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01

BR00.45-Z-1057-06A

MB brake paste Molykote (copper colored)

A 001 989 87 51