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Is it sucktionin the lines that hold the brake caliper open. When it is not being squeesed to stop.???????????
 

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I have not had these calipers apart but in a car it is the square cut seal in the caliper bore around the piston that pulls the piston back when the preasure is released
 

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dupa95 said:
Is it sucktionin the lines that hold the brake caliper open. When it is not being squeesed to stop.???????????
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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.
 
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