Remove/install ABS hydraulic unit

AR42.30-P-0705GR

Remove/install ABS hydraulic unit

17.12.2018

Model

461.302/304/305/331/332/333/334/340/342/343/344/345/346/392, 463.244/245/247/248/250/254/309/332/333 up to 9/30/01

Modification notes

09.07.2009

Information on preventing damage to electronic components due to electrostatic discharge newly included

09.07.2009

Clean area surrounding area of brake line connections, added

Operation step 3

Shown on model 461.392

1

Brake line

2

Electrical connector

3

Union nut

5

Safety clip

A7/3

Traction system hydraulic unit

Shown on model 463 with engine 113

1

Brake line

2

Electrical connector

3, 4

Union nut

A7/3

Traction system hydraulic unit

 

Remove/install

 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

Brake fluid notes

AH42.50-P-0001-01A

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

1

Activate Service mode in Tele-Aid emergency call system

Model 463.244/245/247/248/250/254/309/332/333 with code ET2 (Tele-Aid - Car telephone emergency call system)

AR82.95-P-0005-03GR

2

Disconnect battery ground line

Model 463.244/245/247/248/250/254/309/332/333

AR54.10-P-0003G

Notes on battery

AH54.10-P-0001-01A

Model 461.302/304/305/331/332/333/334/340/342/343/344/345/346/392

AR54.10-P-0003GL



Clean

3

Clean the area around the line connections on the traction system hydraulic unit (A7/3)


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.
Even the smallest particles of dirt, introduced into the hydraulic components, can lead to malfunctions and a total failure of the brake system.

4

Unscrew union nuts (3, 4) and detach brake lines (1)

 Installation:
Do not interchange brake lines (1).
Otherwise the brake system may suffer from malfunctions.

 Seal off connections immediately using stop plugs.

 Brake line to ABS/ESP hydraulic unitBrake line to ABS/ESP hydraulic unit

*BA42.10-P-1004-04B

 Box wrench bit

*000589750300

 Record plug

*129589009100

5

Detach electrical connection (2) from the traction system hydraulic unit (A7/3)

6

Detach securing clamp (5)

Model 461.392

 Installation: Check the securing clamp (5) for deformation; replace if necessary.

7

Remove traction system hydraulic unit (A7/3) from bracket

 Installation: Check rubber grommets for damage, replace if necessary.

8

Install in the reverse order

9

Bleed brake system

MODEL 461.302/304/305/331/332/333/334/340/342/343/344/345/346/392 MODEL 463.244/245/247/250/254/309/332/333 except CODE 979 (Special protection version)

AR42.10-P-0010GG

10

Deactivate service mode in TELE AID emergency call system

Activate/deactivate service mode in TELE AID emergency call system
Model 463.244/245/247/248/250/254/309/332/333 with CODE (ET2) Tele-Aid car Car telephone emergency call system

AR82.95-P-0005-03GR

Information on Tele Aid emergency call system

Model 463.244/245/247/248/250/254/309/332/333 up to 9/30/01
with code ET2 (MB phone with integr. Tele Aid emergency call sys.)

AH82.95-P-0001-01GA

11

Read out and erase fault memory



Connect STAR DIAGNOSIS and read out fault memory

Model 461.302/304/305/331/332/333/334/340/342/343/344/345/346/392, 463.244/245/247/248/250/254/309/332/333 up to 9/30/01
up to model year 2019

AD00.00-P-2000-04A

12

Perform function test

 Brake lines, brake hoses

Number

Designation

Model 461

Model 463 (except 463.236/248/270/271/272/273) up to model year 2019,
model 463.236/248 except code 979 up to model year 2019

BA42.10-P-1004-04B

Brake line to ABS/ESP hydraulic unit

Nm

16

16

 Brake lines, brake hoses

Number

Designation

Model 463
as of model year 2019

BA42.10-P-1004-04B

Brake line to ABS/ESP hydraulic unit

Nm

16