Buick Regal: Hydraulic Brake Fluid Replacement

WARNING: Brake Fluid Irritant Warning.

CAUTION: Brake Fluid Effects on Paint and Electrical Components Caution.

CAUTION: Only use products that comply with GM specifications and check manufacturer information respectively. We recommend the use of GM genuine products. Instructions must be followed at all times. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.

1. With the engine OFF, apply and release the brake pedal several times until the pedal effort becomes firm to deplete the brake booster power reserve.

2. Clean the outer surface of the master cylinder brake fluid reservoir, on and around the reservoir cap, prior to removing the cap and diaphragm.

3. Fill the master cylinder brake fluid reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container.

4. Maintain the brake fluid level in the master cylinder brake fluid reservoir to between the minimum and maximum-fill level during the brake fluid replacement procedure.

5. Following the hydraulic brake system bleeding procedure, bleed each of the hydraulic brake wheel circuits until clean, clear brake fluid is observed coming from each bleeder valve.

6. Fill the master cylinder brake fluid reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container. Brake Master Cylinder Reservoir Filling.

7. Securely install the master cylinder brake fluid reservoir diaphragm and cap.

8. Slowly apply and release the brake pedal, observing the brake pedal feel.

9. If the brake pedal feels spongy, perform the following:

1. Visually inspect the hydraulic brake system for external leaks.
2. Using a scan tool, perform the antilock brake system automated bleed procedure to remove any air that may have become trapped in the brake pressure modulator valve (BPMV).

BRAKE MASTER CYLINDER RESERVOIR FILLING

WARNING: Refer to Brake Fluid Irritant Warning.

CAUTION: Refer to Brake Fluid Effects on Paint and Electrical Components Caution.

1. Visually inspect the brake fluid level through the brake master cylinder reservoir.

2. If the brake fluid level is at or below the half-full point during routine fluid checks, the brake system should be inspected for wear and possible brake fluid leaks.

3. If the brake fluid level is at or below the half-full point during routine fluid checks, and an inspection of the brake system did not reveal wear or brake fluid leaks, the brake fluid may be topped-off up to the maximum-fill level.

4. If brake system service was just completed, the brake fluid may be topped-off up to the maximumfill level.

5. If the brake fluid level is above the half-full point, adding brake fluid is not recommended under normal conditions.

6. If brake fluid is to be added to the master cylinder reservoir, clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.

7. Use only GM approved brake fluid from a clean, sealed brake fluid container to SLOWLY fill the brake master cylinder reservoir to avoid spillage due to overfilling.

BRAKE MASTER CYLINDER RESERVOIR REPLACEMENT

Removal Procedure

WARNING: Brake Fluid Irritant Warning.

CAUTION: Brake Fluid Effects on Paint and Electrical Components Caution.

1. Brake Master Cylinder - Remove.

2. Drain and properly dispose of the brake fluid in the master cylinder reservoir.

3.

Brake Master Cylinder Reservoir Retaining Pin (1) - Remove and DISCARD.

4.

Master Cylinder Reservoir (1) - Remove.

5.

Brake Master Cylinder Reservoir Seal (1) - Remove and DISCARD[2x].

Installation Procedure

1. Lubricate the master cylinder reservoir seals with GM approved brake fluid from a clean, sealed, brake fluid container.

2.

NOTE: Ensure the seals are fully seated in the master cylinder.

Brake Master Cylinder Reservoir Seal (1) - Install NEW[2x].

3.

NOTE: Ensure the master cylinder reservoir is fully seated in the master cylinder.

Master Cylinder Reservoir (1) - Install.

4.

Brake Master Cylinder Reservoir Retaining Pin (1) - Install NEW.

5. Brake Master Cylinder - Install.

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