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The seal groove in a brake caliper is not square, but has a slight angle on it's periphery. This is what causes the piston to retract slightly. This could be the problem, but as I haven't pulled one apart to measure I don't know for sure.The disc on my bike is stainless & was from a chap called Paul Field who sadly died last year. His partner still has some available if you are interested.
The seal groove in a brake caliper is not square, but has a slight angle on it's periphery. This is what causes the piston to retract slightly. This could be the problem, but as I haven't pulled one apart to measure I don't know for sure.
The disc on my bike is stainless & was from a chap called Paul Field who sadly died last year. His partner still has some available if you are interested.
