Remove/install Sensotronic Brake Control (SBC) hydraulic unit

AR42.46-P-0010H

Remove/install Sensotronic Brake Control (SBC) hydraulic unit

06.03.2020

Model

240

1

Left air filter housing

6

Expansion reservoir

A7/3n1

SBC left control unit

2

Intake air duct

7

Brake line

A7/4

SBC right hydraulic unit

4

Expansion reservoir

A7/3

SBC left hydraulic unit

A7/4n1

SBC right control unit

5

Retaining bracket

3

Screw

A7/3

SBC left hydraulic unit

A7/4

SBC right hydraulic unit

 

Remove/install

 Warning

Risk of injury caused by body parts being jammed or crushed. Risk of injury to skin and eyes caused by brake fluid spraying out at high pressure when working on the SBC brake system

Deactivate SBC brake system using STAR DIAGNOSIS.

AS42.46-Z-0001-01A

 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

 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

1

Connect STAR Diagnosis and deactivate SBC brake system

 The vehicle must be raised with STAR Diagnosis connected. Position STAR Diagnosis so that the screen display can be viewed from driver's seat.

2

Turn key in EZS control unit to "0" position

 Vehicles with KEYLESS-GO code 889: Press start/stop button repeatedly until ignition is switched off.

3

Open hood

AR88.40-P-1000H

4

Remove left air filter housing (1) with intake air duct (2)

When removing hydraulic unit at left (A7/3).

AR09.10-P-1150H

5

Hoist vehicle with lifting platform until wheels are free

6

Remove left or right front wheel



AP40.10-P-4050Z

7

Drain coolant at radiator

When removing hydraulic unit at left (A7/4).

Topical note

Notes on coolant

AH20.00-N-2080-01A

AR20.00-P-1142H

8

Remove front section of fender liner in left or right front fender

AR88.10-P-1310H

9

Remove bolt (3) from SBC hydraulic unit (A7/3 or A7/4) on carrier plate

 Bolt, hydraulic unit to support plate

*BA42.46-P-1004-01A

10

Remove expansion reservoir (4) for coolant

When removing hydraulic unit at right (A7/4).

AR20.30-P-4950H

11

Detach retaining bracket (5) from brake lines on longitudinal member



Clean

12

Clean area surrounding the brake lines in area of SBC hydraulic unit (A7/3 or A7/4)


Before opening the SBC brake system, the area around the connecting point should be cleaned thoroughly.
Even the smallest particles of dirt, introduced into the hydraulic components, can lead to malfunctions and a total failure of the SBC brake system.

Assembly cleaner

*BR00.45-Z-1028-04A

13

Disconnect electrical connector from SBC control unit (A7/3n1 or A7/4n1)

14

Pump brake fluid out of expansion reservoir (6) for brake fluid

Topical note

Brake fluid notes

AH42.50-P-0001-01A

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A

15

Mark brake lines (7) and detach from SBC hydraulic unit (A7/3 or A7/4)

 Seal connections immediately.
Collect escaping brake fluid using a lint-free, absorbent cloth.

 Brake line to SBC hydraulic unit

*BA42.46-P-1001-01A

 Torque wrench

*001589872100

 Adapter coupling

*001589001600

 Record plug

*129589009100

16

Remove SBC hydraulic unit (A7/3 or A7/4)

17

Mount brake fluid expansion reservoir (6) to new SBC hydraulic unit (A7/3 or A7/4)

 When replacing the left or right SBC hydraulic unit (A7/3, A7/4).

18

Install in the reverse order

19

Use water to rinse off any escaped brake fluid

20

Perform control unit adaptation and teach-in SBC control unit (A7/3n1 or A7/4n1)

When replacing the SBC hydraulic unit (A7/3 or A7/4).

21

Bleed SBC brake system using Star Diagnosis vehicle diagnosis system, check preload pressure of pressure reservoir and activate SBC brake system

Topical note

Notes on carrying out repair work in the vehicle interior

AH68.00-N-0001-01S



AP42.00-P-4281H

22

Check SBC brake system using Star Diagnosis for air and leak tightness

 Caution

Risk of injury caused by drilling gas-filled assemblies or components (noncombustible gases)

Wear safety glasses and a face mask.

AS00.00-Z-0006-01A

23

Dispose of pressure reservoir

When replacing the left or right SBC hydraulic unit (A7/3, A7/4).

 Sensotronic Brake Control (SBC)

Number

Designation

Model 240

BA42.46-P-1001-01A

Brake line to SBC hydraulic unit

Nm

16

 Sensotronic Brake Control (SBC)

Number

Designation

Model 240

BA42.46-P-1004-01A

Bolt, hydraulic unit to support plate

Nm

15

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01