criticalModerate 3–6 hours (shop) Community experience3,612 views
Source: Widely reported by owners. Not a GM statement. Confirm with a qualified technician.
When to stop driving
Stop driving immediately if the pedal goes soft, sinks to the floor, or fluid is leaking. Brake failure is life-threatening; have the car towed.
Symptoms
- Brake fluid on the inside of a wheel or tire
- Fluid level in the master cylinder dropping
- Soft or sinking brake pedal
- Pulling to one side when braking
- Brake pedal that needs pumping
Likely causes
- Pitting and corrosion in the caliper bores
- Old or hardened piston seals
- Brake fluid that has absorbed moisture
- Long periods of storage without use
What to check
Diagnostic steps, in order. Stop if any step needs tools or skills you don't have.
- 1Check the master cylinder fluid level and note if it keeps dropping.
- 2Look on the inside of each wheel, tire and caliper for wet spots or fluid stains.
- 3Press the brake pedal firmly with the engine off; it should stay firm and not sink.
- 4Have a shop inspect the calipers, lines and hoses.
Possible solutions
- Rebuild the calipers with stainless steel sleeves
- Replace calipers with quality rebuilt or new units
- Replace rubber brake hoses
- Flush the brake fluid
Parts commonly needed
- Rebuilt or stainless-sleeved calipers
- Brake hoses
- Brake fluid
- Brake pads
Warning signs
- Small amounts of fluid near a caliper
- Pedal feel changing over time
- Brake fluid that looks dark
Prevention
- Flush the brake fluid regularly
- Drive the car periodically rather than letting it sit for long periods
- Inspect calipers at every wheel removal
Information here combines factory data and owner experience and may not apply to your exact car. For brakes, steering, suspension, fuel or anything safety-critical, consult a qualified mechanic. Read the full disclaimer.
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