Remove/install rear-axle brake caliper

AR42.10-P-0080MFA

Remove/install rear-axle brake caliper

06.03.2020

Model

118, 177, 247

Shown on model 177.0

1

Brake caliper

2

Electrical connector

3

Screw

4

Brake hose

5

Screw

M76/1

Left electric parking brake actuator motor

M76/2

Right electric parking brake actuator motor

 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 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

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Brake fluid notes

AH42.50-P-0001-01A

Topical note

Notes on externally invisible brake fluid loss

AH42.10-P-9406-02A

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

Notes on safety-relevant components

AH00.00-Z-0019-01A

 

Remove/install

1

Move rear axle brakepads into assembly position.

AR42.10-P-1710-02MFA


Do not depress the service brake during "Move to assembly position".
Otherwise, the spindle in the brake caliper (1) gets damaged.

 Installation: Leave assembly position.

2

Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).

3

Remove cover above brake fluid expansion reservoir.

4

Clean area around cap on brake fluid expansion reservoir.

Assembly cleaner

*BR00.45-Z-1028-04A

5

Unscrew cap on brake fluid expansion reservoir and extract some brake fluid.

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

6

Remove right or left rear wheel and tire assembly.

AR40.10-P-1102MFA

7

Release and disconnect electrical connector (2) from left electric parking brake actuator motor (M76/1) or right electric parking brake actuator motor (M76/2).

8

Remove screw (3), seal brake hose (4) and brake caliper (1), and place brake hose (4) to one side.

AR42.10-P-0013MFA

9

Unscrew screws (5) and remove brake caliper (1).

 Bolt, guide pin to brake caliper

*BA42.10-P-1002-12X

10

Remove brakepads.

AR42.10-P-1710MFA

 Installation: Brake paste or other lubricants must not be applied to the brakepads.



Check

11

Check brakepads for wear and condition.



Model 177

AP42.10-P-4252MFA



Model 247

AP42.10-P-4252MFB



Model 118

AP42.10-P-4252CLA

If a problem is detected,



replace brake linings.

AR42.10-P-1710MFA

12

Check brake caliper (1) for damage.

If the brake caliper (1) is damaged.



Replace brake caliper (1).

13

Check dust boot on brake piston for damage.

If the dust boot is damaged.



Replace brake caliper (1).

14

Install in the reverse order.

Concluding tasks

15

Bleed brake system.

AR42.10-P-0010MFA

 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

16

Operate brake pedal several times until the brakepads contact the brake disks.

 Firm resistance should be noticeable at the brake pedal.

 Danger

Risk of death caused by limbs being caught or crushed by rotating parts when performing tests on the brake test stand

Never leave the vehicle unattended on the rollers except in an emergency. Ensure that no one is under the vehicle or near rotating parts during testing. In case of emergency, use the EMERGENCY OFF switch to shut down test stand.

AS42.00-Z-0001-01A

17

Perform brake test on test stand.



AP42.00-P-4290BA

 Rear axle brake caliper

Number

Designation

Model 118
with code U54 (Compound-link axle)

Model 118
with code U55 (Multi-link axle)

BA42.10-P-1002-12X

Bolt, guide pin to brake caliper

M8

Nm

30

30

 Rear axle brake caliper

Number

Designation

Model 177
with code U54 (Compound-link axle)

Model 177
with code U55 (Multi-link axle)

BA42.10-P-1002-12X

Bolt, guide pin to brake caliper

M8

Nm

30

30

 Rear axle brake caliper

Number

Designation

Model 247
with code U54 (Compound-link axle)

Model 247
with code U55 (Multi-link axle)

BA42.10-P-1002-12X

Bolt, guide pin to brake caliper

M8

Nm

30

30

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01