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 evenly distributed. Any damage to the anti-lock braking system other than poor pipe and hose connections should be taken to a Mercedes-Benz dealer.
Vehicle pulls to one side when braking
- Worn, defective, damaged or dirty brake pads on one side
- Stuck or partially stuck caliper piston
- The linings of the installed brake pads are made of different materials
- Loose caliper mounting bolts
- Worn or damaged steering or suspension components
Screeching or grinding noise when braking
- Worn friction lining of brake pad disc
- Excessive brake disc corrosion (may appear if the car has been idle for some time)
- Foreign object stuck between brake disc and shield (pebble, etc.)
Brake pedal free play is greater than specification
- Faulty master cylinder
- Air in the hydraulic system
- Faulty vacuum booster
«Soft» brake pedal
- Air in the hydraulic system
- Damaged flexible rubber tubes of the high pressure line of the brake system
- Loose master cylinder mounting nuts
- Faulty master cylinder
Excessive force is required to depress the brake pedal
- Faulty vacuum booster
- Disconnected, damaged or leaking brake booster vacuum hose
- Damage in one of the hydraulic circuits
- Stuck caliper piston
- Brake pads installed incorrectly
- Wrong type of brake pads installed
- Dirty brake pads
- Faulty Vacuum Pump - Diesel Models
There is a strong vibration in the brake pedal or steering wheel when braking
- Excessive wear or warping of discs
- Worn brake pads
- Loose caliper mounting bolts
- Worn steering or suspension mounts or components
Wheel braking
- Stuck brake caliper piston
- Parking brake mechanism incorrectly adjusted
- Faulty master cylinder
Rear wheel lock under normal braking
- Dirty rear brake pads
- Deformed rear brake discs
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