Remove/install rear axle brake disk

AR42.10-S-0240E

Remove/install rear axle brake disk

06.03.2020

Model

447, 448

Modification notes

15.03.2018

Method extended

Operation step 1

1

Bolts

2

Brake caliper

3

Caliper support

4

Screw

5

Brake disk

6

Thumbwheel

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

 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

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A

 

Remove/install

1

Connect vehicle diagnosis system and move parking brake into assembly position.

Model 447.8, 448.8



Connect STAR DIAGNOSIS and read out fault memory

AD00.00-S-2000-04E

 To do so, follow the procedure in the menu "Electric parking brake (EFB) control unit".

2

Remove respective rear wheel.

AR40.10-S-1100E

3

Remove respective brakepads on rear axle.

AR42.10-S-1710E

If brake disks (5) are replaced,



replace brake linings.

4

Remove screw/bolts (1).

 Bolt, rear floating caliper carrier to semi-trailing arm

*BA42.10-N-1003-12J

5

Remove brake caliper support (3) with brake caliper (2) and tie up.

 Do not release brake hose.

6

Turn back adjustment wheel (6) of parking brake.

 Installation: Turn the adjustment wheel (6) back to the original position.

If necessary,



Turn the brake disk(5) slightly for better accessibility.

7

Unscrew bolt (4).

 Installation: Replace screw (4).

 Bolt, brake disk to wheel hub

*BA42.10-N-1001-13E

8

Remove brake disk (5).

If brake disk (5) is blocked



Release brake disk (5) by applying light hammer blows to it.



Clean

9

Clean brake surfaces and contact surfaces of brake disk (5).

Assembly cleaner

*BR00.45-Z-1028-04A

10

Clean flange of wheel hub.

11

Apply light coating of grease to contact surface for centering brake disk (5) on wheel hub.

Long-life grease

*BR00.45-Z-1001-06A



Check

12

Check condition of brake disk (5).

Topical note

Notes on evaluating brake disks

AH42.10-N-9406-07B



Inspect condition of brake disks

AP42.10-S-4258E

If corresponding findings are present,



Replace brake disk (5).

 Always replace brake disks (5) in pairs.

13

Check condition of brake shoes on parking brake.

If corresponding findings are present,



Replace brake shoes of parking brake on both sides of vehicle.

AR42.20-S-0530E

14

Install in the reverse order

15

Adjust parking brake.

Model 447.8, 448.8

AR42.20-S-0540E

Model 447.6/7, 448.7

AR42.20-S-0540EA



Check

16

Perform brake test on test stand.



AP42.00-S-4290E

 Rear axle brake disks

Number

Designation

Model 447, 448

BA42.10-N-1001-13E

Bolt, brake disk to wheel hub

Nm

18

 Rear axle brake caliper

Number

Designation

Model 447, 448

BA42.10-N-1003-12J

Bolt, rear floating caliper carrier to semi-trailing arm

M14x1.5

Nm

172

Repair materials

Number

Designation

Order number

BR00.45-Z-1001-06A

Long-life grease

A 000 989 63 51 11

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01