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Incorrect pads? Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Mon, 7 Jun 2004 09:08:16
In Reply to: The plot thins...then thickens, Mickey Finn, Sat, 5 Jun 2004 15:03:42 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I doubt both calipers have become sticky at the same time. And a sticky caliper will be stick most of the time, not just at the beginning.
Let's say that the new pads put in are too thick. This could be due to the wrong pad, or perhaps the shop put a ton and a half of anti-squeal goop on the back. Or they didn't clean out some rust from behind the pad- anything that would cause the pad to stick out a little bit more than usual. New pads provide very little clearance to begin with. My guess is that the new pads are dragging a little. This causes heat, which causes them to expand, so they drag some more. That's why the first few stops are OK, but as things heat up, clearances close down. I'm not quite sure why tapping the brake would do anything, but perhaps when the caliper squeezes, it 'crunches' whatever was causing the brake pad to stand proud, and gives you enough clearance to move off.
If calipers are sticking enough to noticeably slow the car, you'll soon know by the smoke and smell of overheated brake pads. Sticky calipers will overheat pads and rotors, and you will probably notice things like heavy vibration, first under braking, and then just driving around, as the rotor overheats and warps.
My guess - not the calipers. I would pull the wheels, and pop out the brake pads. Give them a looking over - do they look unevenly worn, like they went in crooked? Are the backs heavily gooped up? Are the retaining springs on the back of the pads bent funny? Is there debris behind the pads? I'd clean things up nice and re-install. With the pads in place, you should be able to rotate the tire by hand - it won't be super easy, as you're working against drag inside the tranny, and brake pads do drag just a little. Don't expect to spin the tire and see it turn more than one rotation, if that. But you should be able to turn it by hand. If the brakes are dragging enough for you to notice a loss of power, you shouldn't be able to turn the tire by hand.
posted by 192.249....
, Mon, 7 Jun 2004 09:08:16 <-- Viewing This Message
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