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Rebuild the cylinders on that caliper.
The wheel cylinders are generally located inside the wheel drums on cars and trucks. They work the brake shoes.
There are 2 rubber seals on each end of the wheel cylinders and there leaking. REPLACE THE WHEEL CYLINDERS.
leaky wheel cylinders or calipers
At the top of each of the wheel cylinders
You have a leak(s). Check main brake lines and brake cylinders at each wheel.
Wheel cylinders are in the rear drum brake between the shoes. The Engine's cylinders are in the engine block, under the cylinder head.
change out your wheel cylinders..
Don't bother rebuilding the wheel cylinders. Purchase new ones for less than the price of a rebuild kit. Check with your local auto parts store for prices.
They compress the brake fluid and push the brake shoes out against the brake drum stopping the vehicle.
change the wheel cylinders or the brake lines
if your car has rear drum type brakes you pull off the rear drums the cylinder is at the top between the brake shoes it will also have a brake line to it on the outside of the backing plate if you have 4 wheel disc brakes you have no wheel cylinders you have 4 calipers