Question for a friend.

[Jack Klarich]

Its a shame the technican did not explain it to customer the way you explained it Jack. Now even I understand. Is it the same as the square cut seal that pull piston back from caliper when lever is released, that sometimes allow fluid to pass by, then the dust boot for the piston retains the brake fluid causing no application of the front pads??????

Indeed, the quad seal is a square cut o ring that seals the pressure in the caliper, the dust boots ( outer seal) is just that to keep debris out a good cleaning of the boot and piston is essential before pad installation to insure good caliper action:s