how to fix stripped caliper bolt hole

Fixing a stripped caliper bolt hole is important to ensure the safety and proper function of your vehicle’s braking system. Here are steps to address this issue:

Tools and Materials You’ll Need:

  • New caliper bracket or helicoil kit (if necessary)
  • Appropriate-sized tap and die set (if using a helicoil)
  • Drill and drill bits
  • Penetrating oil
  • Ratchet and socket set
  • Threadlocker (optional)
  • Brake cleaner
  • New caliper bolts


  1. Safety First: Ensure your vehicle is on a level surface and securely supported on jack stands. Make sure the parking brake is engaged, and the wheels are chocked.
  2. Remove the Caliper: Remove the caliper from the caliper bracket by removing the caliper bolts with a ratchet and socket. If the caliper bolt hole is stripped, it’s important to inspect the bracket as well. If the bracket is also damaged, you may need to replace it.
  3. Clean the Area: Use brake cleaner to thoroughly clean the area around the stripped hole to remove any grease, dirt, or debris. This will help ensure a secure repair.
  4. Assess the Damage: Determine the extent of the damage to the stripped hole. If it’s only slightly stripped, you may be able to use a tap and die set to re-thread the hole. If it’s severely stripped or enlarged, you might need to consider a helicoil repair or replace the caliper bracket.
  5. Tapping the Hole (if applicable): If the hole is slightly stripped, you can try tapping it with the appropriate-sized tap and die set to re-cut the threads. Use penetrating oil to lubricate the tap and ensure it goes in straight. Be careful not to tap too deep or at an angle.
  6. Helicoil Repair (if necessary): If the hole is severely stripped or enlarged, a helicoil may be required. Follow the instructions provided with the helicoil kit. Essentially, this involves drilling out the damaged threads, tapping the hole to accommodate the helicoil insert, and then inserting the helicoil, which provides new threads for the caliper bolt.
  7. Insert New Caliper Bolts: Once the hole is repaired, insert new caliper bolts and tighten them securely. If you’re using a helicoil, ensure that the caliper bolts are compatible with the new thread size.
  8. Apply Threadlocker (optional): To further secure the caliper bolts, you can apply a threadlocker compound to the threads. This helps prevent them from loosening over time due to vibration.
  9. Reattach the Caliper: Place the caliper back onto the caliper bracket and align it with the rotor. Insert and tighten the caliper bolts using a ratchet and socket. Follow the manufacturer’s recommended torque specifications for the caliper bolts, which can usually be found in your vehicle’s service manual.
  10. Test and Brake System Bleeding: After reassembly, test the brakes by gently pressing the brake pedal to ensure everything is working correctly. If you disconnected any brake lines during the repair, bleed the brake system to remove any air bubbles.
  11. Final Inspection: Double-check all your work, ensuring that the caliper is securely attached and there are no signs of leaks, unusual noises, or issues with brake performance.
  12. Reassemble and Road Test: Once you are confident in the repair, reassemble any other components you removed, lower the vehicle off the jack stands, and take your vehicle for a test drive. Be cautious and test the brakes at slow speeds to ensure they are functioning correctly.

If you’re not comfortable with these steps or if the damage is extensive, it’s advisable to seek professional assistance from a qualified mechanic who can inspect, repair, or replace the affected parts as needed to ensure the safety of your vehicle.

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