Remove/install hydraulic unit

AR42.30-S-0706P

Remove/install hydraulic unit

09.03.2020

Model

470, 471

1

Brake lines

5

Bracket

8

Nut

2

Hydraulic unit

6

Bracket

9

Nut

3

Master brake cylinder

7

Electrical connector

10

Screw

4

Brake lines

 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

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-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

Notes on inspecting corrosion on brake lines

AH42.50-Z-0002-01A

 

Remove/install

1.1

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

Model 470, 471
with code FX9 (KEYLESS GO)

1.2

Switch off ignition and remove ignition key.

Model 470, 471
except code FX9 (KEYLESS GO)

2

Extract brake fluid from brake fluid reservoir.

 Commercially available devices/tools
Suction bellows



Clean

3

Clean connections of brake lines (1) on hydraulic unit (2) and master brake cylinder (3).

Assembly cleaner

*BR00.45-Z-1028-04A

4

Clean connections of brake lines (4) on hydraulic unit (2).

Assembly cleaner

*BR00.45-Z-1028-04A

5

Mark assignment of brake lines (1) to hydraulic unit (2) and master brake cylinder (3).

6

Mark assignment of brake lines (4) to hydraulic unit (2).

7

Remove brake lines (1).


Do not permanently deform the brake lines (1).
Otherwise, the brake lines (1) will be damaged as a result.

 Seal connections.

 Record plug

*129589009100

8

Remove brake lines (4) from hydraulic unit (2).


Do not permanently deform the brake lines(4).
Otherwise, the brake lines (4) will be damaged as a result.

 Seal connections.

 Record plug

*129589009100

9

Unhook holder (5) from holder (6).

10

Detach electrical connector (7).


Do not touch, deform or damage contacts of electrical connector (7) and do not allow any foreign objects, soiling or fluids to ingress into the electrical connector (7).
Otherwise, damage and malfunctions will occur.

11

Unscrew nuts (8, 9).

12

Remove hydraulic unit (2) with holder (6).

13

Unscrew screw (10) and remove hydraulic unit (2) from holder (6).

If hydraulic unit (2) is replaced.



Install

14

Attach hydraulic unit (2) to holder (6).

If hydraulic unit (2) was replaced.

 Screw in screw (10) to do this.

 Bolt, hydraulic unit to bracket

*BA42.30-N-1002-03P

15

Install hydraulic unit (2) with holder (6).

16

Unscrew nuts (8, 9).

 Nut, hydraulic unit bracket to body

*BA42.30-N-1001-03P

17

Connect electrical connector (7).


Do not touch, deform or damage contacts of electrical connector (7) and do not allow any foreign objects, soiling or fluids to ingress into the electrical connector (7).
Otherwise, damage and malfunctions will occur.

18

Hook holder (5) onto holder (6).

19

Attach brake lines (4) to hydraulic unit (2).

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

AH00.00-P-0015-01CW


Do not permanently deform the brake lines(4).
Otherwise, the brake lines (4) will be damaged as a result.

 Note assignment of brake lines(4).

 Commercially available devices/tools
Open end wrench bit, 10 mm

 Union nut, brake line to hydraulic unit

*BA42.10-N-1004-04P

20

Install brake lines (1).

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

AH00.00-P-0015-01CW


Do not permanently deform the brake lines (1).
Otherwise, the brake lines (1) will be damaged as a result.

 Note assignment of brake lines (1).

 Union nut, brake line to hydraulic unit

*BA42.10-N-1004-04P

 Union nut, brake line to master brake cylinder

*BA42.10-N-1005-04P

 Box wrench bit

*140589000300

21

Fill brake fluid reservoir with new brake fluid.



000 588 01 82 00 Filling unit

WS25.00-P-0016B

 Brake fluid filling capacity

*BF42.10-N-1001-01P

22

Read out and delete fault memory.



AD00.00-S-2000-06P

23

Bleed brake system.

AR42.10-S-0010P

24

Perform brake test.



AP42.00-S-4290P

 Brake lines, brake hoses

Number

Designation

Model 470, 471

BA42.10-N-1004-04P

Union nut, brake line to hydraulic unit

M8

Nm

13

M10

Nm

16

M12

Nm

18

 Brake lines, brake hoses

Number

Designation

Model 470, 471

BA42.10-N-1005-04P

Union nut, brake line to master brake cylinder

Nm

18

 Hydraulic unit

Number

Designation

Model 470, 471

BA42.30-N-1001-03P

Nut, hydraulic unit bracket to body

Nm

21

 Hydraulic unit

Number

Designation

Model 470, 471

BA42.30-N-1002-03P

Bolt, hydraulic unit to bracket

Nm

6

 Brake fluid

Number

Designation

Model 470, 471

BF42.10-N-1001-01P

Brake fluid filling capacity

l

 1

Sheet

BB00.40-P-0330-01A

Sheet

BB00.40-P-0331-00A

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01