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:
Tire marking
Tire size
245/45 R 18 96 Y
245: nominal width in mm
45: aspect ratio in %
R: radial tire code
18: rim diameter in inches
96: load bearing capacity
Y: speed code letter
ZR tires: reinforced radial tire for speeds exceeding
150 mph/240 km/h
Maximum tire load
Maximum tire load is the maximum permissibl
Driving Dynamics Control
Principle
The Driving Dynamics Control influences the
driving dynamics properties of the vehicle.
The vehicle can be adjusted depending on the
situation using various driving modes.
General information
The following systems are affected, for instance:
Engine characteristics.
Steptronic transmiss
