Remove/install master brake cylinder

AR42.10-D-0300TS

Remove/install master brake cylinder

28.08.2020

Model

907, 910

Shown on model 910 with transmission 700.76 and with code MJ8 (ECO start/stop function)

1

Master brake cylinder

2

Feed hose

3

Nut

4

Brake lines

5

Retaining screws

6

Sealing ring

7

Electrical connector

 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

 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 working on clutch operating system

Model 907 with transmission 700.790
Model 907 with transmission 711.6
Model 910 with transmission 700.760

AH25.20-N-0003-01TS

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

Notes on inspecting corrosion on brake lines

AH42.50-Z-0002-01A

 

Remove/install

1

Remove vacuum in brake booster.

 To do this, operate brake pedal several times.

2

Extract brake fluid from brake fluid reservoir.

 Commercially available devices/tools
Extraction bellows

 To do so, open brake fluid reservoir.

3

Remove feed hose (2) from clutch master cylinder.

Model 907 with transmission 700.790, 711.6
Model 910 with transmission 700.76

 Catch escaping brake fluid using a suitable rag and seal openings.

 Record plug

*129589009100

4

Detach electrical connector (7).

5

Remove brake fluid reservoir.

When replacing the master brake cylinder (1).

AR42.10-D-0308TS

6

Detach brake lines (4).

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

AH00.00-P-0015-01CW

 To do so, remove coupling screws (5). Catch escaping brake fluid using a suitable rag and seal openings.

 Retaining screw, brake line to master brake cylinder

*BA42.10-N-1004-14TS

 Box wrench bit

*140589000300

 Record plug

*129589009100

7

Remove master brake cylinder (1).

 To do so, remove the nuts (3).

 Installation: Replace compression ring(6).

 Nut, brake master cylinder to brake booster

*BA42.10-N-1001-05TS



Check

8

Check brake booster for inner soiling caused by brake fluid.

Topical note

Notes on externally invisible brake fluid loss

AH42.10-P-9406-02A

If soiling is present,



replace brake booster.

Model 907

AR43.10-D-0350TSR

Model 910

AR43.10-D-0350TSF

9

Install in the reverse order.

Bleeding

10

Bleed brake system.

AR42.10-D-0010TS

 Model 907 with transmission 700.790, 711.6
Model 910 with transmission 700.760
For these vehicles, bleed clutch operation system as well.

 Master brake cylinder

Number

Designation

Model 907, 910

BA42.10-N-1001-05TS

Nut, brake master cylinder to brake booster

Nm

20

 Brake lines, brake hoses

Number

Designation

Model 907, 910

BA42.10-N-1004-14TS

Retaining screw, brake line to master brake cylinder

Nm

14