Bleed brake system

AR42.10-S-0010M

Bleed brake system

14.08.2017

Model

638

except code BB0 (Antilock brake system (ABS))

except code CL0 (Rear air suspension, lowerable and liftable)

Model

638

with code BB0 (Antilock brake system (ABS))

except code CL0 (Rear air suspension, lowerable and liftable)

Model

638

with code CL0 (Rear air suspension, lowerable and liftable)

except code BB0 (Antilock brake system (ABS))

Modification notes

11.08.2017

Work procedure and presentation updated

Operation steps 1 to 10

AR42.10-S-0010-02A

Shown on brake system without code BB0 (Brake system, anti-lock braking system ABS) and without code CL0 (Lowerable and raisable rear air suspension)

1

Right front disk brake

2

Left front disk brake

3

Right rear disk brake

4

Left rear disk brake

5

Brake booster

6

Brake fluid reservoir

7

Master brake cylinder

8

Automatic load-dependent brake controller

9

Right front brake hose

10

Right front brake line

11

Brake line to automatic load-dependent brake controller

12

Brake line to automatic load-dependent brake controller

13

Left front brake line

14

Left front brake hose

15

Brake hose, right rear

16

Brake line from automatic load-dependent brake controller to right rear brake caliper

17

Brake line from automatic load-dependent brake controller to left rear brake caliper

18

Brake hose, rear left

 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

Bleeding

1

Unscrew brake fluid reservoir (6) cap

2

Connect filling unit



000 588 01 82 00 Filling unit

WS25.00-P-0016B


Do not connect filling unit when brake fluid reservoir (6) is completely empty.
Otherwise air can enter the brake system.

 Pay attention to manufacturer's operating instructions.

Venting pressure at expansion reservoir

*BE42.50-N-1001-01B

 Brake fluid

*BF42.00-N-1001-01A

3

Carry out bleeding procedure in specified sequence

AR42.10-S-0010-02A

 Bleed valve to fixed caliper (rear axle)

*BA42.10-N-1001-01A

 Bleed valve on floating caliper (front axle)

*BA42.10-N-1001-03A

4

Remove filling unit



000 588 01 82 00 Filling unit

WS25.00-P-0016B

 Pay attention to manufacturer's operating instructions.



Check

5

Press brake pedal several times and check brake system for leaktightness

If, after having performed bleeding of the brake system, there is still a suspicion of air being present in the brake system.



Repeat bleeding procedure.

6

Check brake fluid level

Depending on findings



Correct brake fluid level.

 Brake fluid

*BF42.00-N-1001-01A

Check values for hydraulic braking system

Number

Designation

Model 638

BE42.50-N-1001-01B

Venting pressure at expansion reservoir

bar

2...2,5

 Rear axle fixed caliper

Number

Designation

Model 638

BA42.10-N-1001-01A

Bleed valve to fixed caliper (rear axle)

ITT

Nm

10

Bosch

Nm

12

 Front axle floating caliper

Number

Designation

Model 638

BA42.10-N-1001-03A

Bleed valve on floating caliper (front axle)

ITT

Nm

10

Bosch

Nm

12

Brembo

Nm

–

 Brake system

Number

Designation

Model 638

BF42.00-N-1001-01A

Brake fluid

TT brake circuit splitting

Liter

–

X brake circuit splitting

Liter

0,4

with ABS/ABD or ABS/ETS

Liter

0,8

Sheet

BB00.40-P-0331-00A