Brake system (Opel Omega A)

Note: Before concluding that the brake system is faulty, check the front wheel alignment, tire condition and tire pressure. Also make sure that the vehicle is not overloaded and that the load is distributed evenly. Any damage to the anti-lock brake system, other than poor pipe or hose connections, should be referred to a Mercedes-Benz dealer.

The car pulls to the side when braking

• Brake pads on one side are worn, defective, damaged or dirty
• The caliper piston is jammed or partially jammed
• The linings of the installed brake shoes are made of different materials
• The caliper mounting bolts are loose
• Steering or suspension components are worn or damaged

Squealing or grinding noise when braking

• The friction lining of the brake pad disc is worn out
• Excessive corrosion of the brake disc (may appear if the car has been idle for some time)
• A foreign object is stuck between the brake disc and the shield (pebble, etc.)

Brake pedal free play is greater than specified in Specifications

• The master cylinder is faulty
• Air in the hydraulic system
• The vacuum booster is faulty

"Soft" brake pedal

• Air in the hydraulic system
• The flexible rubber tubes of the high-pressure brake system line are damaged
• Master cylinder mounting nuts are loose
• The master cylinder is faulty

Excessive force is required to press the brake pedal

• The vacuum booster is faulty
• Brake booster vacuum hose is disconnected, damaged or not tightly connected
• Damage in one of the hydraulic circuits
• The caliper piston is stuck
• Brake pads are installed incorrectly
• The wrong type of brake pads are installed
• The brake pads are dirty
• Vacuum pump faulty - diesel models

When braking, a strong vibration is felt on the brake pedal or steering wheel

• Excessive wear or deformation of discs
• The brake pads are worn out
• The caliper mounting bolts are loose
• Worn steering or suspension mounts or components

Wheel braking

• The brake caliper piston is stuck
• The parking brake mechanism is not adjusted correctly
• The master cylinder is faulty

Rear wheel lockup during normal braking

• The rear brake pads are dirty
• The rear brake discs are deformed