How to Retract Piston in Rear Disc Brake
When doing rectify work such as pad or rotor substitution on rear disc brakes, one of the most common problems amateurish mechanics run into is retracting the caliper piston in order to fit the install pads over the rotor so that the caliper can be re-mounted to the hub caparison. This can be a very thwart trouble and is frequently the end of what could be a worry-free home brake job. here are the basic steps for retracting the caliper piston while doing a brake job .
Have the Right Tools
Beyond the basic tools that you need for basic car care, you ’ ll need a few extra things while working on your magnetic disk brakes. One is a medium size “ C ” clamp. For most vehicles, a 6 edge clamp is batch big enough, however an 8 inch clamp may be necessary for very big vehicles with the largest brakes. It ’ s a good idea to have a can of especial non-chlorinated bracken uninfected on hand in character you have to clear off excessive dirt. You ’ ll besides want a few clean, thick rags to use american samoa well.
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Get the Caliper Ready
once the vehicle is raised and the bicycle is removed, select the discipline instrument to loosen the caliper wax bolts. Keep in mind that you may need Torx® oral sex wrenches or other special tools. once the caliper mount bolts are removed, the caliper itself should easily slide loose of the rotor. Once the caliper is removed from the hub, you will be able to remove the pads relatively well vitamin a well. Keep in take care that even though the wax bolts have been removed from the caliper, it will still be attached to the vehicle by the brake hydraulic line. This should not be removed or loosened for any cause. now you ’ re ready to compress the piston .
Compressing the Piston
once the caliper is removed, the piston should be pretty easy to spot : it ’ s the circular part on the inside coat of the “ C ” shape of the caliper. It is normally shaped like an empty can. The first matter you should do is inspect the condition of the piston. Look at the navy seal surrounding the piston ’ randomness out surface to make sure that it there aren ’ t any signs of leaking hydraulic fluid. clear excessive dirt from the area surrounding the piston if necessary and clean the outer surface of the piston itself. Next, place one of the rags inside the cup of the piston and slip the clamp around the out surface of the caliper, with the adjustable side of the clamp resting inside the piston pit.
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once the clamp is in place, merely tighten it slowly, taking concern that the piston is compressing true back in the hold, and not being forced at an slant. It should move back pretty readily with the clamp coerce, and finally it will reach the end of its range when it is fully retracted in the caliper caparison .
now that the piston is retracted, you are cook to install your modern pads or rotors, and complete your brake speculate.
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