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E46 (1998-2006) E46 (1998-2006, petrol) E36 (1990-2000) E30 (1982-1994) E21 (1975-1983)
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  • Troubleshooting the brake system

Troubleshooting the brake system (BMW 3 Series E46)

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Note: To confirm that the brake system is the problem, make sure that the tires are in good condition and properly inflated, that the front wheel alignment is within the recommended limits, and that the vehicle is evenly loaded. Except for checking the condition of all pipes, hoses, and connections, any problem with the ABS system should be seen by your dealer.


The car skids to one side when braking
  • Worn, damaged or contaminated front or rear brake pads on one side (chapters 9 and 1)
  • Jamming or partial seizure of the brake caliper piston (chapters 9 and 1).
  • The brake shoe linings installed on one axle of a vehicle are made of different materials (chapters 9 and 1).
  • Loosening the brake caliper mounting bolts (chapter 9). Worn or damaged suspension or steering components (chapters 1 and 10).

Noise (squealing) when braking
  • Wear of the friction lining down to the base metal of the brake shoe (chapters 1 and 9).
  • Excessive corrosion of the brake disc (may occur during long-term storage of the vehicle) (chapters 1 and 9).
  • Foreign particles stuck inside the brake (fragments of stones, etc.), in contact with the disk (heads 1 and 9).

Excessive brake pedal travel
  • Master cylinder failure (chapter 9).
  • Air in the hydraulic system (chapters 1 and 9).
  • Vacuum booster malfunction (chapter 9)

Feeling of "elasticity" when pressing the brake pedal
  • Air in the hydraulic system (chapter 9).
  • Deterioration of the brake system hoses (chapters 1 and 9).
  • Loosen the master cylinder mounting nuts (chapter 9).
  • Master cylinder failure (chapter 9).

Excessive brake pedal force is required to stop the vehicle


  • Vacuum booster malfunction (chapter 9).
  • Disconnection, damage or poor connection of the brake booster vacuum hose (chapter 9).
  • Malfunction of the primary or secondary hydraulic circuit (chapter 9)
  • Brake caliper piston sticking (chapter 9).
  • Incorrect installation of brake pads (chapters 1 and 9).
  • Installation of brake pads of a non-regulated type (chapters 1 and 9).
  • Contamination of brake pad linings (chapter 9).

Feeling intense vibration when braking through the brake pedal or steering wheel
  • Excessive end runout or warpage of discs (heads1 and 9).
  • Wear of brake shoe linings (chapters 1 and 9).
  • Loosening the brake caliper mounting bolts (chapter 9).
  • Wear of suspension or steering components (chapters 1 and 10)

Brakes sticking
  • The brake caliper piston is stuck (chapter 9).
  • Incorrect adjustment of the parking brake mechanism (chapter 9).
  • Master cylinder failure (chapter 9).

This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
Article verified: Ilyinsky Matvey

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Previous articles
БМВ E46: Troubleshooting
Next articles

Troubleshooting differential and driveshaft
Troubleshooting Automatic Transmission
Troubleshooting a Manual Transmission
Troubleshooting Clutch Problems
Troubleshooting fuel and exhaust systems
Troubleshooting Suspension and Steering
Troubleshooting electrical equipment


Similar articles on other types of BMW cars:
Maintenance of the brake system BMW 5 Series E12 (1972-1981)
Diagnostics of brake system faults BMW 5 Series E34 (1988-1996)
Diagnostics of brake system faults BMW 7 Series E32 (1986-1994)
Checking the brake system and clutch BMW 7 Series E38 (1994-2001)
Brake system — equipment and tools BMW X3 E83 (2003-2010)
Checking the brake system BMW X5 E53 (1999-2006)
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BMW E46 (1998-2006) 
  • General information
  • Manual
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  • Exterior
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BMW E46 (1998-2006, petrol) 
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BMW E36 (1990-2000) 
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  • Supply system
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BMW E30 (1982-1994) 
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  • M10/M20 engine
  • M40 engine
  • Ignition system
  • Lubrication system
  • Cooling system
  • Supply system
  • Fuel injection
  • Exhaust system
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  • Front axle
  • Rear axle
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BMW E21 (1975-1983) 
  • General information
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  • Engine repair
  • Cooling and lubrication system
  • Supply system
  • Ignition system
  • 6-cylinder engine
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