Understanding Seized Brake Calipers

A seized brake caliper occurs when the caliper's piston or pivot arm becomes stuck, preventing the brake from fully releasing after application. This issue can lead to reduced braking performance, uneven brake pad wear, and potential damage to other brake components.

Common Causes of Seized Calipers

Several factors can contribute to a seized rear caliper pivot arm:

  • Corrosion: Moisture and road salt can cause rust buildup on the caliper components.
  • Lack of lubrication: Insufficient or degraded lubricant on pivot points can lead to sticking.
  • Contaminated brake fluid: Moisture in the brake fluid can cause internal corrosion.
  • Worn seals: Deteriorated seals can allow contaminants to enter the caliper assembly.

Diagnosing a Seized Caliper

To determine if your rear caliper pivot arm has seized:

  • Check for uneven brake pad wear
  • Listen for squeaking or grinding noises while braking
  • Observe if the wheel spins freely when the brake is not applied
  • Inspect the caliper visually for signs of corrosion or damage

Solutions for a Seized Caliper

Lubrication and Cleaning

1. Remove the caliper from the vehicle

2. Clean all pivot points thoroughly

3. Apply high-temperature brake grease to moving parts

4. Reassemble and test the caliper's movement

Brake Fluid Flush

Perform a complete brake fluid flush to remove contaminated fluid and introduce fresh, clean fluid into the system.

Caliper Rebuild or Replacement

If cleaning and lubrication don't resolve the issue, consider:

  • Rebuilding the caliper with a new seal kit
  • Replacing the entire caliper assembly with a new or remanufactured unit

Preventive Maintenance

To avoid future caliper seizures:

  • Regular inspections: Check brake components during routine maintenance
  • Proper lubrication: Apply brake grease to caliper slide pins and pivot points
  • Timely brake fluid changes: Replace brake fluid according to manufacturer recommendations
  • Protective coatings: Apply anti-corrosion coatings to brake components in harsh climates

Professional Assistance

If you're uncomfortable performing these repairs, seek help from a qualified mechanic. Brake system integrity is crucial for vehicle safety.

FAQs About Seized Brake Calipers

    • Can I drive with a seized caliper?
      It's not recommended as it can lead to uneven braking, reduced stopping power, and damage to other components.
    • How often should brake calipers be serviced?
      Typically, calipers should be inspected during brake pad replacements or every 12,000 to 15,000 miles.
    • Are remanufactured calipers a good option?
      Yes, quality remanufactured calipers can be a cost-effective alternative to new OEM parts, often with similar warranties.