brake caliper Install Question
Thread Starter
Instructor
Joined: Dec 2007
Posts: 245
Likes: 2
From: Jersey shore NJ
brake caliper Install Question
Ok, I got my rotor run out set and I'm installing the Rebuilt O- ring calipers.
When I took the calipers out of the box and removed the foam spacers holding the pistons apart, I had to push pretty hard with my hand to make the pistons go back into the caliper on the fronts. The backs moved in much easier. Seems tighter than I would expect on the fronts? How much drag should i have on the fronts when installed on the rotor without fluid in it? I can spin the fronts by hand, but they stop as soon as I take my hand off of them. the pads are dragging.
When I took the calipers out of the box and removed the foam spacers holding the pistons apart, I had to push pretty hard with my hand to make the pistons go back into the caliper on the fronts. The backs moved in much easier. Seems tighter than I would expect on the fronts? How much drag should i have on the fronts when installed on the rotor without fluid in it? I can spin the fronts by hand, but they stop as soon as I take my hand off of them. the pads are dragging.
Melting Slicks
Joined: Jan 2003
Posts: 2,877
Likes: 13
From: Doha
St. Jude Donor '08
I have the same concerns about how tight the pistons should be, I have 1 piston out of the four which is pretty hard to get inside when pushed by hand! .. I was thinking of honing the bore a little, but I fear losing the whole thing!
Race Director
Joined: Jul 2004
Posts: 12,684
Likes: 329
From: Scottsdale Arizona
I know that when I assemble o-ring pistons in the caliper bores, I lube the o-ring with brake fluid. The pistons are normally very easy to move. On occasion, I miss one and it can have a surprising amount of drag. Once assembled and filled with fluid, they work fine though. It may well be as simple as that.
Instructor
Joined: Mar 1999
Posts: 219
Likes: 2
From: Gainesville Florida
I had the same issue with mine. When the o ring is dry that will happen ,as soon as it gets wet it will be fime. There is supposed to be a slight drag on the pads, there designed to do that. That is what the spring in the caliper behind the pad is supposed to do.
Thread Starter
Instructor
Joined: Dec 2007
Posts: 245
Likes: 2
From: Jersey shore NJ
The front pads seem to have a little more free space on the outer pads than the inner. Everything is new I was just wondering if the rotors are not centered good? If I moved the rotors out a little it seems that there would be a little more play on the inner pads.
