Bleed brake system

AR42.10-P-0010MCU

Bleed brake system

10.11.11



Remove

Danger!

Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes.

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



Brake fluid notes

AH42.50-P-0001-01A



Notes on repairs to brake system

AH42.00-P-0003-01A

1

Remove wheels

 Position the front support plates of the vehicle lift as far as possible upwards, position the rear support plates as far as possible downwards and secure the vehicle to prevent it from slipping or toppling.

AR40.10-P-1100MCU

2

Remove dust caps from the brake bleeder valves

3

Lower vehicle with vehicle lift

4

Remove maintenance flap

5

Unscrew cap of brake fluid reservoir (1)

6

Connect brake fluid changer to brake fluid reservoir (1) and apply the specified pressure to the brake system

 Observe the operator's manual for the brake fluid changer.

Brake fluid change unit

gotis://B_42/43.2_01



General brake fluid

Sheet 330.1

BB00.40-P-0330-01A



Brake fluids (DOT 4 plus)

Sheet 331.0

BB00.40-P-0331-00A

Bleed primary circuit

7

Connect hose of the brake fluid receptacle to the brake bleeder valve of the right wheel brake cylinder (3) and open the brake bleeder valve

 Only close the brake bleeder valve when the brake fluid escapes free of bubbles and without contaminants (light color of brake fluid).

A second person is needed who assists the brake fluid changer by slowly pumping on the brake pedal.



*BA42.10-P-1001-08C

8

Carry out the bleeding process on the left wheel brake cylinder (3), on the right brake caliper (2) and on the left brake caliper (2) in the same manner

 Observe correct sequence.



*BA42.10-P-1001-08C



*BA42.10-P-1002-10A

9

Check brake pedal travel

 In the event of a soft pedal feel or long pedal travel, bleed the secondary circuit of the brake system.

Bleed secondary circuit

10

Connect STAR DIAGNOSIS and bleed the secondary circuit of the brake system

 The instructions for secondary circuit bleeding are specified by STAR DIAGNOSIS.

A second person is needed who assists the brake fluid changer by slowly pumping on the brake pedal.



Connect STAR DIAGNOSIS and read out fault memory

AD00.00-P-2000-04MCC

11

Disconnect brake fluid changer

12

Check brake fluid level and correct if necessary



Brake system - inspect fluid level

AP42.10-P-4210MCC



Install

13

Screw on cap of brake fluid reservoir (1)

14

Install maintenance flap

15

Raise vehicle with vehicle lift

16

Press dust cap onto brake bleeder valve

17

Mount wheels

AR40.10-P-1100MCU

18

Check brake system for leaks

AR42.10-P-0100-01MCC

Number

Designation

Model 451.3/4

BA42.10-P-1001-08C

Brake bleed valve to rear axle wheel brake cylinder

Nm

7

Number

Designation

Model
451.3/4

BA42.10-P-1002-10A

Brake bleeder valve to brake caliper

Nm

7