Should have been more specific,40 years in the trade is begining to tell.
Basically if the the disc does not run true with the hub (wheel ) it is bolted to,when you apply the brakes the pads will bounce on and off and the fluid will move back and forth up the pipe to the master cylinder giving the on off motion you describe as the clamping force is not constant.
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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