Buick Regal: Brake Pulsation

WARNING: Brake fluid may irritate eyes and skin. In case of contact, take the following actions:

• Eye contact - rinse thoroughly with water.
• Skin contact - wash with soap and water.
• If ingested - consult a physician immediately.

CAUTION: Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, suitable containers, and fender covers to prevent brake fluid from contacting these areas. Always re-seal and wipe off brake fluid containers to prevent spills.

CAUTION: Avoid spilling brake fluid on any of the vehicle's painted surfaces, wiring, cables or electrical connectors. Brake fluid will damage paint and electrical connections. If any fluid is spilled on the vehicle, immediately flush the area with water to minimize the potential for damage.

CAUTION: Power steering fluid, engine oil, brake fluid, or any mineral based fluids cannot be mixed. If brake seals contact power steering fluid or steering seals contact brake fluid, seal damage will result.

NOTE:

• Do not reuse the brake fluid collected during the hydraulic brake system bleeding
• Always store brake fluid in a closed container.
• Reseal brake fluid containers immediately after use.
• Do not use brake fluid left in an open container.
• Do not use brake fluid left in an improperly sealed container.
• Do not use the following fluids in the hydraulic brake system:
  • Power steering fluid
  • Automatic transmission fluid
  • DOT 5 silicone hydraulic brake fluid

For the correct brake fluid, refer to Adhesives, Fluids, Lubricants, and Sealers.

BRAKE SYSTEM NOISE

BRAKING ACTION UNEVEN - PULLS TO ONE SIDE

Test Description

The numbers below refer to the step numbers in the diagnostic table.

4

Suspension components that are not operating properly may cause a disturbance to the vehicle during application of the brake system.

5

Steering components that are not operating properly may cause a disturbance to the vehicle during application of the brake system.

BRAKING ACTION UNEVEN - FRONT TO REAR

Test Description

The number below refer to the step number in the diagnostic table:

4

Suspension components that are not operating properly may cause a disturbance to the vehicle during application of the brake system.

BRAKE PEDAL EXCESSIVE TRAVEL

BRAKE PEDAL EXCESSIVE EFFORT

BRAKES DRAG

BRAKE SYSTEM SLOW RELEASE

BRAKE FLUID LOSS

DISC BRAKE SYSTEM DIAGNOSIS

Test Description

The numbers below refer to the step numbers in the diagnostic table:

9

Lubricant leaks from non-brake system components may come in contact with and contaminate brake system components.

10

Lubricant leaks from non-brake system components may come in contact with and contaminate brake system components.

12

Disc brake rotor shields/backing plates that come in contact with disc brake rotors may cause brake system noise.

15

Disc brake rotor thickness variation that exceeds the maximum acceptable level can cause brake pulsation.

19

Disc brake rotor thickness variation that exceeds the maximum acceptable level can cause brake pulsation.

22

Disc brake rotor assembled lateral runout (LRO) that exceeds the maximum acceptable level can lead to thickness variation.

HYDRAULIC BRAKE SYSTEM DIAGNOSIS

BRAKE ASSIST SYSTEM DIAGNOSIS

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