Why does one side of the piston move more then the other?
One side would move more then the other. The reason for this is the friction between the piston and the piston seal. Dot fluid will help lubricate the retraction movement but that alone may not be enough. Ideally as part of the overhaul you should use some form of silicon grease.
What are the Pistons in rear disc brakes?
Cars with rear disc brakes have self-adjusting pistons that move in and out when the parking brake is applied. These pistons usually screw in and out, so need to be turned to make them retract for pad replacement. Why Is My Car’s Heater Not Working? (And How To Fix It)
When do you replace brake pads what do the pistons do?
When replacing brake pads a C-clamp is used to force the pistons back into the calipers. Cars with rear disc brakes have self-adjusting pistons that move in and out when the parking brake is applied.
What’s the best way to retract a piston?
Pump the lever to push the pistons out a 4-5 mm and dab dot grease around the piston edge with a cotton wool bud or very small paint brush. Push the piston back in and repeat the process a few times, forcing the grease into the piston seal surface. Eventually it should be nicely lubricated and pistons should retract quickly and evenly.
How are the Pistons in the caliper pushed back?
Most new vehicles have about six pistons in a caliper. When pressure is applied to the brake pedals in your vehicle, the master cylinder forces down brake fluid through the brake pipes to the brake caliper. In the caliper, the brake piston then pushes the whole caliper back; this causes the brake pads and the disc to make contact.
What do you need to push back rear brake piston?
To successfully push back the rear caliper brake piston, you will need a simple tool such as a plier or a screwdriver. You need to twist the piston clockwise; clockwise will spin the piston inward into the housing itself inside the caliper, and then you will be able to change your brake pads.
Where are the brake pistons in a car?
Brake pistons are usually found in brake calipers. They are a vital part of the brake system of your vehicle. The brake pistons installed in your vehicle help the brake pads make contact with the brake discs, which slows the movement of your car. These pistons can be made from either steel, rubber, or aluminum.
What happens to pistons when pressure is removed?
When pressure is removed it’s the seal that acts as a return spring. Pistons are designed to creep out of the seal to take up pad wear and give consistent lever throw. Imagine the impact of a strong spring causing full return on worn pads – loads of free stroke on every lever pull.