Bleed brake system

AR42.10-P-0010RT

Bleed brake system

08.02.2019

Model

251

Shown on vehicle with AIRMATIC (air suspension with level adjustment and adaptive damping system ADS), code 489

1

Bleed screw on right rear axle floating brake caliper

4

Bleed screw on left front axle floating brake caliper

2

Bleed screw on left rear axle floating brake caliper

5

Cap

3

Bleed screw on right front axle floating brake caliper

6

Brake fluid reservoir

Bleeding

 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

Notes on externally invisible brake fluid loss

AH42.10-P-9406-02A

Topical note

Brake fluid notes

AH42.50-P-0001-01A

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A

1

Open engine hood and raise to vertical position

AR88.40-P-1000RT

2

Remove cap (5) from brake fluid reservoir (6)

3

Connect filler/bleeder unit

 Observe manufacturer's operating instructions.
Bleeding pressure must be 2 bar.

 Brake fluid

*BF42.10-P-1001-01H

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

4

Lift/jack up vehicle

AR00.60-P-1000RT

5

Adjust bleeding pressure on filling and bleeding unit to 2 bar

6

Remove bleeder unit dust caps

7

Connect hose of bleed bottle to bleed screw on right rear axle floating brake caliper (1)

8

Open bleed screw at right rear axle floating brake caliper (1) and allow approx. 80 cm3 of brake fluid to flow out free of bubbles, then tighten to correct torque

 Bleed screw to brake caliper

*BA42.10-P-1001-12L

9

Repeat bleeding procedure at remaining floating brake calipers

 Bleeding sequence: Bleed screw at right rear axle floating brake caliper, bleed screw at left rear axle floating brake caliper, bleed screw at right front axle floating brake caliper, bleed screw at left front axle floating brake caliper.

 Bleed screw at brake caliper

*BA42.10-P-1001-10L

 Bleed screw to brake caliper

*BA42.10-P-1001-12L

10

Detach filling/bleeding device

11

Attach bleeder unit dust caps and caps



Check

12

Check fluid level in brake fluid reservoir and correct if necessary

 Brake fluid

*BF42.10-P-1001-01H

13

Check brake system for leaks

AR42.10-P-0100-01RT

14

Check fluid level of brake system



AP42.10-P-4210RT

 Front axle brake caliper

Number

Designation

Model 251 (except 251.077/177)

Model 251.077/177

BA42.10-P-1001-10L

Bleed screw at brake caliper

Nm

18

18

 Rear axle brake caliper

Number

Designation

Model 251

BA42.10-P-1001-12L

Bleed screw to brake caliper

Nm

7

 Brake fluid

Number

Designation

Model 251

BF42.10-P-1001-01H

Brake fluid

Filling capacity

Liter

0,8

Sheet

BB00.40-P-0330-01A

Sheet

BB00.40-P-0331-00A