Quote:
Originally posted by Peryn
If im not mistaking, there is a seal in the caliper behind the dustboot. That keeps the hydraulic fluid from leaking out, and keeps it moving the piston. But it also has another important function - it acts like a spring to pull the pads back away from the rotor. As that seal starts to age, wear, and stretch, it will loose its ability to pull the pad back effectively.
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mmmm, don't think so.
The piston will have a seal around it to keep the fluid in (obviously) but it doesn't pull the piston back.
With disk brakes, when you remove your foot from the pedal, you remove the force, which removes the pressure in the system.
The pads never really back off per se, they just dont clamp any more and the rotar is now free to spin. There's always a touch of drag i suppose.
That's one of the beauties of disk brakes - you never need to adjust them like you used to with drum brakes since the wear in the pads is always compensated for each time you put the brakes on.
With drum brakes, you have to adjust them every once in a while to take up the slack as the shoes wear.