BMW X5 Owners & Service Manuals

BMW X5: Replacing Fluid In ABS/ASC+T Brake System

Necessary preliminary tasks:

IMPORTANT: When carrying out repairs to the brake system, follow the procedure set out in Bleeding brake system with DSC.

Connect brake fluid changer to expansion tank and switch on.

NOTE: Check relevant Operating Instructions for each device.

Charging pressure should not exceed 2 bar.

Brakes
Fig. 14: Connecting Brake Fluid Changer To Expansion Tank

Flushing brake system completely

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Open bleeder valve and purge until clear, bubble-free brake fluid emerges.

Close bleed valve.

Follow same procedure on rear left, front right and front left wheel brake.

Brakes
Fig. 15: Connecting Bleeder Hose With Collecting Tray

NOTE: The clutch slave cylinder must also be scavenged in vehicles with manual transmissions.

Switch off brake fluid changer and remove from expansion tank.

Check brake fluid level.

Close expansion tank.

NOTE: Pay attention to rubber seal (1) in sealing cap.

Brakes
Fig. 16: Identifying Rubber Seal

CHECKING SERVICE BRAKE: HIGH- AND LOW-PRESSURE TESTS

IMPORTANT: The high/low-pressure test (leakage test) must be carried out with the engine switched off.

Observe safety instructions on raising the vehicle.

High-pressure test (leakage test):

Perform test on both brake circuits.

1st brake circuit, front axle
2nd brake circuit, rear axle

Remove bleeder screw, connect pressure tester and bleed.

Load brake pedal with a force and block brake pedal with pedal support, refer to Technical Data.

After 2 minutes, pressure is permitted to drop by max. 8 %.

Low-pressure test:
Perform test on both brake circuits.

Reset pedal support until test pressure in braking system is 2... 5 bar.

Vehicle and measuring apparatus must remain steady as vibrations will distort the result.

Pressure must remain constant for a test period of 5 minutes.

Check all rubber parts in case of excessive pressure drop.

Bleed brake calipers and wheel brake cylinders after finishing test.

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