Brake system (Audi 100 C3)

Note: Before troubleshooting a brake problem, make sure the tires are in good condition and properly inflated, the front wheels are properly aligned, and the vehicle is not overloaded.

• The brake shoe/pad linings on one side of the vehicle are worn, defective, damaged or dirty (Section 9).
• The front brake caliper/piston of the wheel brake cylinder is jammed or partially jammed (Section 9).
• Brake caliper or shield mounting bolts are not tightened (Section 9).
• Steering or suspension components are worn or damaged.

• Brake pad or shoe friction material worn down to bare metal
• Excessive corrosion of the brake disc or drum (Section 9).
• Presence of a foreign body (stone, etc.) between the brake disc and the shield.

• Faulty rear brake (self-adjusting mechanism - shoe brakes (Section 9).
• Defective master cylinder (Section 9).
• Air in the hydraulic system (Section 9).
• Defective vacuum servo device (Section 9).
• The brake pedal sinks when pressed
• Wear of flexible rubber tubes of the high-pressure line of the brake system
• The master cylinder mounting nuts are loose (Section 9).
• Defective master cylinder (Section 9).

• Defective vacuum servo device (Section 9).
• Defective vacuum pump - diesel models (Section 9).
• Disconnected, damaged brake servo motor vacuum hose (Section 9).
• Hydraulic line failure (Section 9).
• The brake caliper or the piston of the working brake cylinder is stuck (Section 9).
• Brake pads or brake shoes are not installed correctly
• Incorrect type of brake pads or brake shoes (Section 9).
• Dirty brake pads or brake shoe linings.

• Excessive wobble or distortion of discs/drums (Section 9).
• The brake pad or brake shoe linings are worn out (Section 9).
• The brake caliper or drum brake shield mounting bolts are loose.

• Sticking of the brake caliper or piston of the working brake cylinder.
• The handbrake mechanism is not adjusted correctly (Section 9).
• Defective master cylinder (Section 9).

• Dirty rear brake shoe linings (Section 9).
• Defective pressure regulator in the brake system (Section 9).