Glazed brakes refer to a condition where the surface of the brake pads or brake rotors has become hardened and smooth, losing the friction necessary for effective braking. This glazing usually results from excessive heat buildup due to prolonged or intense braking, often in situations like driving down long, steep hills, or in stop-and-go traffic where the brakes are used continuously.
Causes of Glazed Brakes:
- Overheating: When the brakes are used excessively, the friction between the brake pads and the rotors generates a lot of heat. If the brakes overheat, the brake pads can harden and become smooth, causing glazing.
- Improper Bedding: New brake pads need to be properly “bedded” to ensure optimal contact with the rotors. If this process is not done correctly, glazing can occur.
- Riding the Brakes: Constantly pressing lightly on the brake pedal, known as “riding the brakes,” can cause the pads to heat up and glaze.
Symptoms of Glazed Brakes:
- Reduced Braking Performance: The most noticeable symptom is a significant decrease in braking efficiency. The car may take longer to stop, and the brakes may feel unresponsive.
- Squealing or Squeaking Noise: Glazed brakes often produce a high-pitched squealing or squeaking sound when the brake pedal is pressed.
- Vibration or Pulsation: You might feel vibrations through the brake pedal when braking, especially at high speeds.
- Brake Fade: In severe cases, the brakes may fade, meaning they lose their ability to slow down or stop the vehicle effectively.
Solutions to Glazed Brakes:
- Brake Pad Replacement: If the brake pads are glazed, they usually need to be replaced. Sometimes, they can be resurfaced, but replacement is often the best option.
- Brake Rotor Resurfacing or Replacement: If the rotors are also glazed, they may need to be resurfaced (machined) or replaced to restore their proper function.
- Proper Bedding-In: After replacing the brake pads or rotors, ensure they are bedded in properly by following the manufacturer’s recommended procedure. This involves gradually applying the brakes under controlled conditions to ensure even wear and proper friction.
Prevention:
- Avoid Heavy Braking: Try to avoid continuous heavy braking, especially when going downhill. Use engine braking (downshifting) to assist with slowing down.
- Allow Cooling Time: Give the brakes time to cool if they’ve been used heavily. Avoid riding the brakes and use them in short, firm applications rather than continuous light pressure.
- Regular Maintenance: Regularly check the condition of your brakes and replace worn pads and rotors as needed. Proper maintenance can prevent glazing and ensure your brakes function effectively.
Glazed brakes compromise safety, so it’s essential to address the issue promptly to maintain reliable braking performance.
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