Remove/install ETS/ASR/ESP(R) hydraulic unit

AR42.40-P-0816FR

Remove/install ETS/ASR/ESP(R) hydraulic unit

06.03.2020

Model

257

Model

290

1

Nuts

A7/3

Traction system hydraulic unit

2

Electrical connector

K40/8

Engine fuse and relay module

3

Brake lines

N30/4

Electronic Stability Program control unit

4

Elastomer bearing

6

Screw

5

Bracket

A7/3

Traction system hydraulic unit

 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 repairs to brake system

AH42.00-P-0003-01A

Topical note

Brake fluid notes

AH42.50-P-0001-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Notes on safety-relevant components

AH00.00-Z-0019-01A

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

AH00.00-P-0015-01CW

 

Remove/install

1

Carry out commissioning of ESP® control unit (N30/4).

When installing a new traction system hydraulic unit (A7/3).



AD00.00-P-2000-06FR

 The Electronic Stability Program control unit (N30/4) is part of the traction system hydraulic unit (A7/3).

2

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

3

Remove cover over brake fluid reservoir.

 Installation: Install cover only after bleeding the brake system.

4

Unscrew nuts (1) and place engine fuse and relay module (K40/8) with connected electric lines to one side.



Clean

5

Clean traction system hydraulic unit (A7/3) in the area of the brake line connections.


Thoroughly clean area around connecting points before opening hydraulic system.
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

6

Release and disconnect electrical connector (2) from ESP® control unit (N30/4).

AR42.45-P-0820-01FR


It is essential to follow the work instructions for disconnecting the electrical connector (2).
Otherwise the locking mechanism may be damaged.


Do not touch, deform or damage contacts of electrical connector (2) and do not allow any foreign objects, soiling or fluids to enter the electrical connector (2).
Otherwise, the Electronic Stability Program control unit (N30/4) may be damaged or it may malfunction.

7

Mark brake lines (3) relative to the corresponding connection on the traction system hydraulic unit (A7/3).

8

Detach brake lines (3) from traction system hydraulic unit (A7/3).


Seal brake lines (3) and connections on traction system hydraulic unit (A7/3).
Otherwise the traction system hydraulic unit (A7/3) may be damaged by the entry of foreign objects.

 Installation: Route the brake lines (3) such that they are free of tension and do not chafe against adjacent parts.
Pay attention to marking.

 Retaining screw, brake line to hydraulic unit

*BA42.10-P-1004-04P

 Box wrench bit

*000589750300

 Box wrench bit

*140589000300

 Record plug

*129589009100

9

Remove traction system hydraulic unit (A7/3) with ESP® control unit (N30/4) upwards and out of elastomer bearings (4).

 Installation: Make sure that the studs (arrows) of the bracket (5) are correctly seated in the elastomer bearings (4).



Check

10

Check elastomer bearings (4) for wear and damage.

If there is a problem,



Replace elastomer bearing(4).

11

Remove screw (6) and holder (5).

When installing a new traction system hydraulic unit (A7/3).

 Screw/bolt, bracket to traction system hydraulic unit

*BA42.45-P-1001-01M

12

Install in the reverse order.

13

Bleed brake system.

AR42.10-P-0010FR

14

Read out and delete fault memory using vehicle diagnosis system.



AD00.00-P-2000-06FR

 Brake lines, brake hoses

Number

Designation

Model 257

Model 290.658/659/661 except code B07/U69

BA42.10-P-1004-04P

Retaining screw, brake line to hydraulic unit

Nm

16

16

 Brake lines, brake hoses

Number

Designation

Model 290.658/659/661 with code B07/U69,
model 290.679/688/689

BA42.10-P-1004-04P

Retaining screw, brake line to hydraulic unit

Nm

16

 Electronic Stability Program (ESP®)

Number

Designation

Model 257

Model 290

BA42.45-P-1001-01M

Screw/bolt, bracket to traction system hydraulic unit

M8

Nm

18

-

M10

Nm

-

27

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01