Brake piston repair should be taken care of immediately, especially when you notice that the brakes of your vehicle are not working properly. In fact, the job can be done by anyone with basic mechanical knowledge. Before you start brake piston repair task, it is important to understand the role of this part plays in the braking system.
When brake pedals are depressed, the force applied is transferred onto brake pistons, which then presses the break liners against the wheel drum. This creates friction between brake pads and wheel drum forcing the wheel to decrease its rotational speed. Due to lot of friction and mechanical movements, brake pistons become subject to wear and tear. Thus, to preserve the brake system of your vehicle in proper working condition, occasional repair or replacement of brake pistons becomes imperative
Replacing brake pistons should be carried out slowly and methodically. Be sure that you have enough time and patience to undertake this do-it-yourself task.
Step-by-Step method for Repairing Brake Pistons
1: Park your car on a leveled surface and raise it using a jack stand.
2: Loosen the lug nuts with the use of a ratchet or tire iron. Once the loose lug nuts are taken out, pull out the tire from wheel dangle and place it on the ground face upwards.
3: Now detach the brake pads from caliper by removing the retaining clips that hold them in place.
4: Request someone to press the brake pedals, which will then force the calipers to push brake pistons onto the rotor. This will then ease pressure on calipers, thereby allowing you to easily take them out.
5: The brakes pistons can now be taken out, but the one brake piston should not move while the other is being taken out. A brake caliper piston removal tool comes handy in here.
6: Alternatively, a pressurized air hose can also be engaged for blowing out the other piston while the first one is firmly held in place. In this case, you need to use a C-clamp for securing the piston in place. Ensure that the caliper is wrapped in rags to keep brake fluid from spraying while pressurized air in blown on it.
7: The caliper can now be cleaned as both the pistons are out and ready to be repaired or changed.
8: The piston kit comes together with piston cylinder seal, rubber dust boot, and retainer pins for pistons and brake pads. Inspect the condition of the brake pistons.
9: If there are no obvious cracks, scratches, or fissures on the brake pistons, they just need some cleaning. Possibly, the seal or the retainer pins were damaged, which can be easily replaced.
10: After every part is properly cleaned, start reassembling the entire system one by one.
- Pistons must be properly oriented with the rotor.
- Before you replace brake pads, apply the brake again so that pistons push themselves towards the rotor.