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Description & Operation

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2006 BMW X5, 2005 BMW X5, 2004 BMW X5, 2003 BMW X5, and 2002 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Brake friction materials such as brake linings or pads contain abrasive fibers which can lead to illnesses. Do not create dust by grinding or sanding, or cleaning the pads with compressed air. Wash away or vacuum up brake dust. Avoid breathing any brake friction fibers or dust.
WARNING: Brake fluid is poisonous, highly corrosive and dangerous to the environment. Wear safety glasses and rubber gloves when working with brake fluid. Do not siphon brake fluid with your mouth. Use a siphon system dedicated to brake fluid only. Immediately clean away any fluid spilled on painted surfaces and wash with water. Dispose of brake fluid properly.
CAUTION: Do not reuse self-locking nuts, bolts or fasteners. They are designed to be used only once and may fail if reused. Always replace them with new self-locking nuts. Ensure cleanliness and only use rags which do not lose lint. Ensure that no oils or grease enter the brake system. These substances would cause complete failure of the entire brake system. When cleaning brake components with brake cleaning fluid, none must enter the brake system.
NOTE: For information on Anti-Lock Brake Systems (ABS), see ANTI-LOCK/TRACTION CONTROL article.

The brake system is one of the most important safety systems on any motor vehicle. For this reason it is necessary to exercise particular caution when working on the brake system and to comply with all instructions.

Brake system is hydraulically-operated, using a tandem master cylinder and power brake booster. Some models use a power steering pump driven booster. All models are equipped with single piston front and rear disc brake calipers. A brake pressure regulator is used to reduce fluid pressure to rear brakes.

Parking brake is cable actuated on rear brake and consists of internally mounted parking brake shoes. Basic adjustment of the parking brake is required whenever:

  1. Brake shoes are replaced.
  2. Brake discs are replaced.
  3. Bowden cable is replaced.
  4. Bowden cable guide tube is replaced.
  5. Adjusting unit is reset.
  6. Actuating stroke is excessive.
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