Brake calipers all office under the twin premise. A hydraulic piston extends from the caliper Muzzle when necessitate is placed on the brakes. The movement of the piston squeezes the friction data of the brake pads against the metal surface of the rotor. When replacing brakes, the pistons must be retracted to constitute time for the thicker pads and/or rotors. This will damage the protective boot. Lift up on the bubbled areas of the boot to release the air or use a plastic pick (not a metal one) to help you maneuver the boot to restore it to its collapsed position.
1. Facilitate the removed caliper to the suspension or frame of the vehicle with a bungee cord so it does not hang from the rubber brake hose. This Testament prevent damage to the brake hose. Whether relevant, remove the pads from the caliper. Some vehicles adoption pads that extreme in the caliper mount and removing them from the caliper is not required.
2. Interpret the repair instruction for your particular vehicle to dispose which type of caliper you are trying to compress the piston to. Some pistons simply retract by slowly squeezing the piston into the Muzzle. This can be done with the CD brake caliper piston thing place or much a goodly C-clamp. Put the wedge plate from the establish onto the propel arbour of the stuff. Subsume the backside of the guide arbour into the caliper piston. You can too benefit the backing plate of the broken down pad or a block of wood against the caliper piston. Considering some pistons are phenolic, they can crack or cleft under duress. Corner the wedge plate up against the outer caliper housing and tighten the thing until the handle arbour and wedge plate are working well-balanced to compress the piston. Abide to slowly tighten the stuff by plam until the caliper piston is fully retracted into the Muzzle. Loosen the stuff and then remove it.
3. Match up the right adapter of the CD brake piston tool or the CD brake piston effects establish to the screw-in type caliper. These pistons carry visible grooves on the face of the piston. Many makes and models of cars retain different-size grooves that wish discrepant adapters. The belongings has six sides or the kit features up to nine applications. Insert the adapter onto the face of the caliper piston until the notches mate the grooves. If using the set to retract the piston, employ the same procedure as in step two with the wedge plate and drive arbor up against the adapter on the face of the piston. If using just the tool, a ratchet and extension with suitable matching drives will be required. Turn the ratchet or drive arbor clockwise to slowly compress the piston into the bore until it is fully seated. Make sure that the piston does not employ a left-handed thread. Although rare, some cars may use a right-hand thread piston on the left side and a left-handed piston on the right side. On some import cars, bottoming the piston fully into the bore can cause damage to the piston or parking brake mechanism. The manual will alert you of this if applicable. Using a ratchet may also require someone to hold the caliper steady for you while you start to turn the tool.
4. Inspect the caliper boots once the pistons are retracted and the tools are removed. Sometimes air can become trapped inside the boots when retracting caliper pistons. This will cause them to bubble up above the surface of the compressed piston and can get trapped between the piston and pad when the caliper piston returns. Not all caliper pistons practice the corresponding procedure to retract the pistons, on the contrary. Rear calipers can sometimes desire the piston to be turned clockwise (or counterclockwise in some cases) to retract the piston. Alive which type of caliper you intend to appliance the CD brake piston baggage on Testament cooperation prevent damage to the caliper or effects.