Quote:
Originally Posted by xsport
the springs are quite capable of pushing back a piston. provided of course it moves freely and is not sticking or seized. sometimes , as i have said in a previous post they can take quite a bit of forcing into the piston, no matter how square you try to offer them in....  |
The springs mentioned (I assume are rivetted to the back of the pads?) hold the pad to the piston. The piston itself is retracted away from the disc by the flex in the hydraulic seal when the brake fluid pressure is released - i.e. rollback. All the springs do is to make sure the pads move away from the disc with the piston.
Or at least that's how it was done on Girling sliding caliper brakes (the Colette) on which all sliding calipers are based.
Still have no explanation about how pads can wear at the top and bottom unless the pad backplate is bent.