Remove/install brake line from master brake cylinder to the ESP(R) hydraulic unit

AR42.10-P-0034MCC

Remove/install brake line from master brake cylinder to the ESP(R) hydraulic unit

10.07.2018

Model

451.3/4

except code 494 (US version)

Shown on model 451.431, left-hand drive vehicle

1

Brake lines

3

Nuts

4

Screw

5

Bracket

6

Hydraulic unit

7

Guide pin

8

Retaining clip (on left-hand drive vehicles, not on model 451.39/49)

9

Electrical line (on left-hand drive vehicles, not on model 451.39/49)

10

Master brake cylinder

Shown on model 451.431, right-hand drive vehicle

1

Brake line

6

Hydraulic unit

10

Master brake cylinder

11

Retaining clip (only on right-hand drive vehicle)

12

Bracket (only on right-hand drive vehicle)

Shown on model 451.490, right-hand drive vehicle

1

Brake lines

10

Master brake cylinder

13

Front axle carrier support

6

Hydraulic unit

12

Bracket (only on right-hand drive vehicle)

 

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

1

Remove brake lines from hydraulic unit (6) to rear axle

AR42.10-P-0035MCC

 Remove brake lines from hydraulic unit (6) to rear axle only as far as it takes for the bracket (5) to be removed.

2

Remove front axle carrier support (13)

Model 451.390/392/490/492 2#
except code 494 (US version)

AR33.10-P-0002MEX

3

Release retaining clip (11) from brake line (1) and unclip brake lines (1) from bracket (12)

Model 451.3## (except 451.390/392) 2# , 451.4## (except 451.490/492) 2#
except code 494 (US version)

4

Open bracket (12) and remove brake lines (1)

Model 451.390/392/490/492 2#
except code 494 (US version)

5

Loosen nuts (3), unscrew screws/bolts (4) and remove bracket (5)

 Installation: Move the guide pin (7) on the hydraulic unit (6) into the bracket (5).

 Screw/bolt, ESP hydraulic unit bracket to floor panel

*BA42.45-P-1008-01F

6

Support hydraulic unit (6) using telescopic lifter and removal fixture and lower carefully until brake lines (1) are accessible



000 588 11 62 00 Major assembly mount

WS01.00-P-0092B

 Removal fixture

*450589026200

7

Unclip retaining clip (8) of electrical line (9)

Model 451.3## (except 451.390/392) 1# , 451.4## (except 451.490/492) 1#
except code 494 (US version)

8

Check color coding of threaded connections of brake lines (1) to the hydraulic unit (6) and the master brake cylinder (10)

AR42.10-P-0013-05MCC

 Installation: Label brake lines (1) accordingly.

9

Loosen threaded connections of brake lines (1) to the hydraulic unit (6) and the master brake cylinder (10) and separate

 Collect brake fluid in a suitable container. Seal connections using suitable plugs.

 Installation: Use a 12 mm open-end wrench bit. Do not bend the brake lines (1); make sure that they are routed correctly, are leaktight and are clear of other components.

 Brake pipe to master brake cylinder

*BA42.10-P-1005-04E

 Brake line to ESP hydraulic unit

*BA42.10-P-1010-04E

10

Remove brake lines (1)

11

Install new brake lines (1)

Only if the brake lines (1) with the red color coding have been detached.

12

Install in the reverse order

13

Bleed brake system

AR42.10-P-0010MCC

 Brake lines, brake hoses

Number

Designation

Model 451.3/4

BA42.10-P-1005-04E

Brake pipe to master brake cylinder

Nm

16

 Brake lines, brake hoses

Number

Designation

Model 451.3/4

BA42.10-P-1010-04E

Brake line to ESP hydraulic unit

Nm

16

 Electronic Stability Program (ESP)

Number

Designation

Model 451.3/4

BA42.45-P-1008-01F

Screw/bolt, ESP hydraulic unit bracket to floor panel

Nm

25