Excessive pedal travel
- Air in the hydraulic system
- Brake fluid leak
Uneven braking and pulling to one side
- Brake disc pads or brake shoes are contaminated with oil or brake fluid
- The caliper or wheel cylinder is jammed
- Uneven tire pressures
Intense vibration when braking
- Worn discs or drums
- Brake disc pads or brake shoes are contaminated with oil or brake fluid
Spongy brake pedal action
- Air in the hydraulic system
- The master cylinder is faulty
Excessive pedal force is required to stop the car
- The amplifier unit is faulty
- Drum brake linings are excessively worn
- The caliper or wheel cylinder is jammed
- Brake disc pads or brake shoes are contaminated with oil or brake fluid
- Malfunction of one hydraulic line
[A link to the original source is available on the website: AUDImanual]