Remove/install master brake cylinder

AR42.10-P-0300LF

Remove/install master brake cylinder

06.03.2020

Model

217, 222

Modification notes

07.08.2014

Retaining screw, brake line to hydraulic unit

MODEL 217 except AMG

BA42.10-P-1004-04N

07.08.2014

Retaining screw, brake line to hydraulic unit

MODEL 217 AMG

BA42.10-P-1004-04N

Shown on MODEL 222.057/157

1

Master brake cylinder

2

Brake lines

3

Nuts

A7/7

BAS brake booster

 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 externally invisible brake fluid loss

AH42.10-P-9406-02A

Topical note

Brake fluid notes

AH42.50-P-0001-01A

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A

 

Remove/install

1

Eliminate vacuum in BAS brake booster (A7/7)

 To do this, press the brake pedal several times with the engine switched off.

2

Remove hydraulic fluid reservoir for brake fluid

AR42.10-P-0301LF



Clean

3

Clean master brake cylinder (1) in area of brake line (2) connections


Before opening the hydraulic system the area around the separation point should be cleaned thoroughly.
Otherwise minute particles of dirt in the hydraulic components can result in malfunctions and total failure of the hydraulic system.

 Only use clean, lint free rags and cleaner free of mineral oil. Do not use any compressed-air for cleaning when the brake system is open.

Assembly cleaner

*BR00.45-Z-1028-04A

4

Mark brake lines (2) to match connections

5

Detach brake lines (2) from master brake cylinder (1)


Seal connection fittings on master brake cylinder (1).
Foreign objects can otherwise enter the master brake cylinder (1) and cause damage.

 MODEL 217, 222Retaining screw, brake line to master brake cylinder

*BA42.10-P-1003-04N

 Box wrench bit

*000589750300

6

Seal connection fittings at master brake cylinder (1)

 Record plug

*129589009100

7

Detach brake lines (2) on hydraulic unit and turn brake lines (2) to one side

 MODEL 217, 222Retaining screw, brake line to hydraulic unit

*BA42.10-P-1004-04N

8

Unscrew nuts (3)

 Nut, brake master cylinder to brake booster

*BA42.10-P-1001-05K

9

Remove master brake cylinder (1) from BAS brake booster (A7/7)


Do not tilt the master brake cylinder (1); pull it forward and in a straight line out of the BAS brake booster (A7/7).
Otherwise the push rod will be pressed out of its axial position.


Collect brake fluid which runs out with an absorbent rag.
Otherwise damage can occur to the vehicle paint.

 Installation: Replace sealing ring between master brake cylinder (1) and BAS brake booster (A7/7).

10

Install in the reverse order

11

Bleed brake system

AR42.10-P-0010LF



Check

12

Check brake system for leaks

AR42.10-P-0100-01V

13

Carry out brake test on the test stand



AP42.00-P-4290BA

 Master brake cylinder

Number

Designation

Model 217

Model 222

BA42.10-P-1001-05K

Nut, brake master cylinder to brake booster

Nm

25

25

 Brake lines, brake hoses

Number

Designation

Model 217.364/382/384/385/482

Model 217.377/378/379/477/478/479

BA42.10-P-1003-04N

Retaining screw, brake line to master brake cylinder

Ø4.75

Nm

18

18

Ø6

Nm

16

16

Ø8

Nm

24

24

 Brake lines, brake hoses

Number

Designation

Model 222 (except 222.077/177/178/179/187/188)

Model 222.077/177/178/179/187/188

BA42.10-P-1003-04N

Retaining screw, brake line to master brake cylinder

Ø4.75

Nm

18

18

Ø6

Nm

18

18

Ø8

Nm

24

24

 Brake lines, brake hoses

Number

Designation

Model 217.364/382/384/385/482

Model 217.377/378/379/477/478/479

BA42.10-P-1004-04N

Retaining screw, brake line to hydraulic unit

Ø4.75

Nm

16

16

Ø6

Nm

16

16

Ø8

Nm

-

-

 Brake lines, brake hoses

Number

Designation

Model 222 (except 222.077/177/178/179/187/188)

Model 222.077/177/178/179/187/188

BA42.10-P-1004-04N

Retaining screw, brake line to hydraulic unit

Ø4.75

Nm

18

18

Ø6

Nm

18

18

Ø8

Nm

24

24

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01