Carrying out bleeding operation

AR42.10-S-0010-02E

Carrying out bleeding operation

 Danger !

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

Model

447, 448

 Front axle floating caliper

Number

Designation

Model 447, 448

BA42.10-N-1001-03B

Bleed valve at front axle floating brake caliper

Nm

14

 Rear axle brake caliper

Number

Designation

Model 447, 448

BA42.10-N-1001-12J

Vent valve on rear axle floating caliper

Nm

14

1

Remove caps from bleed valves on all brake calipers (1, 2, 3, 4).

2

Mount bleed hose of bleed bottle onto bleed valve of right rear brake caliper (1).

3

Open bleed valve of brake caliper (1).

4.1

To bleed the hydraulic system of the brake system if the hydraulic system was opened for repair purposes.
Repeatedly operate brake pedal until new brake fluid flows out without any bubbles.

 To bleeding the brake system correctly it is absolutely essential to pump the brake pedal throughout the entire bleeding process.
Otherwise, brake system malfunctions and a failure of the brake system may occur due to remaining residual air.

 To prevent air from being drawn in, do not pump the brake pedal in a jerking manner but instead release it slowly.
Otherwise, an extension or a repetition of the bleed procedure may be necessary.

 The bleed valve of the brake caliper (1) may remain open throughout the entire pumping procedure.
Required total quantity of brake fluid: approx. 1.5 l.

4.2

To replace the brake fluid if the brake system's hydraulic system was not opened beforehand for repair purposes.
Leave bleed valve of brake caliper (1) open, until new brake fluid flows out.

 Pumping of the brake pedal is not necessary.
Required total quantity of brake fluid: approx. 0.75 l.

5

Close bleed valve of brake caliper (1).
 Brake caliper (2, 4)
 Brake caliper (1, 3)

6

Detach bleed hose of bleed bottle from bleed valve of brake caliper (1).

7

Repeat operation steps 2 to 6 on the remaining brake calipers (2, 3, 4).

 Process brake calipers (2, 3, 4) in numerical sequence.

8

Fit caps for bleed valves onto all brake calipers (1, 2, 3, 4).