BMW X5: Replacing Fluid In ABS/ASC+T Brake System
Necessary preliminary tasks:
- Remove left microfilter housing cover.
- Read and comply with General Information.
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.
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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.
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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.
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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.
READ NEXT:
Overview Of Front Brakes
Fig. 17: Identifying Front Brake Components
Brake disc
Brake caliper
Brake-pad wear sensor
Brake pads
Pulse generator
Brake hose
Brake guard plate
Checking thickness of brake pad
Special to
Removing And Installing/Replacing Both Front Brake Discs
Special tools required:
34 1 280.
Necessary preliminary tasks:
Remove front wheels.
Remove and clean brake pads.
After completing work, read and comply with notes on braking in new brake
disc
SEE MORE:
Replacing Front Crankshaft Radial Seal (N52K)
Special tools required:
11 9 221
11 9 222
11 9 223
11 9 224
11 9 231
11 9 232
11 9 233
Necessary preliminary tasks:
Remove vibration damper
IMPORTANT: Do not release central bolt.
If the central bolt is released, the sprocket wheels of the timing chain and the
oil pump will no longer be
Tire chains
Safety information
Warning
With the mounting of tire chains on unsuitable
tires, the tire chains can come into contact with
vehicle parts. There may be a risk of accident
or risk of damage to property. Only mount tire
chains on tires that are designated by their
manufacturer as suitable for the use
