No, I believe it is the same as most automobilies. There is a square cut seal in the caliper that rides on the piston and seals the cylinder. When you apply the brake the seal flexes a few thousands of an inch and the pads are pushed against the rotor. When you release the pressure, ( release the brake lever) the presure drops and the square cut seal flexes back and pulls the piston a few thousands of an inch away from the rotor.dupa95 said:Is it sucktionin the lines that hold the brake caliper open. When it is not being squeesed to stop.???????????