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Hydraulic Brakes-Help

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Old 07-23-04, 02:00 PM
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Hydraulic Brakes-Help

I just got a new bike a couple days ago (04 P.3) and Ive hit the trails at C.O.P once. my front brake (8" rotor) seems to rub against the brake pads almost as if the rotors warped, but I've checked the rotor and it dosnt seem to be warped. Please help me on this. I've used the search function but couldn't come up with an answer. O ya and my brakes are Hayes HFX 9
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Old 07-23-04, 02:39 PM
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First nono of hydros, Don't keep the bike resting upsidedown on the seat/handlebars.

My suggestion is to check the how the rotor sits between the pads. It should be in the middle. If it is not, you may have to add spacers to the caliper.

I saw this once, and think it is a fluke, but on some XT's the pads were unevenly set. the pad to left was pushed out a little more than the pad to the right. After popping the cap on the resevoir, pushing the pads all the way in, and then rebleeding... that took care of it.

Since this is new, I would take it back to the bike shop and have them go over it, should hopefully be part of their service policy on new bikes.

Best pit of advice I can give, get somone to help bleed the back brake.
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Old 07-23-04, 03:57 PM
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If all else fails, switch to Avid Mech's. When my Avid's rub, a twist of a dial will fix everything up. I think they come in 8" too, although I'm not sure.
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Old 07-23-04, 04:12 PM
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Ya I was looking at the rotor and it sits right on the caliper, i think i will take it into the shop and have it checked out, that would be easier, but i just want to learn for myself if it happens later and i dont have access to a shop
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Old 07-23-04, 04:25 PM
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You need to adjust the position of the caliper. Do you have any "feeler" gauges for setting the gaps on spark plugs?

Regardless, find a very thin piece of metal or a thick piece of paper. Wedge it between the brake pad and the rotor. Then squeeze the lever and strap a rubber band around it to keep it pulled.

Then loosen the bolts holding the caliper to the frame. Wiggle the caliper. Force it a bit. Make sure it's loose. Then retighten. This should shift the caliper in the direction away from where it rubs.

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Old 07-23-04, 04:33 PM
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I'm having the same problem. It should be a big thing. I don't have time before I go to Mt.Snow. Should I have the bike shop there look at it?
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Old 07-23-04, 04:52 PM
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Thanks a2p, I'm pretty sure that should solve it, and that dosnt sound too complicated.
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Old 07-23-04, 04:55 PM
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Do you know how much distance i need in the rear caliper? because i have a feeler gauge handy
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Old 07-23-04, 05:23 PM
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ok i tried what you said a2p and it seems to have fixed the problem for now, but the rotor is still riding a little close to the caliper so i'll have to watch out for that
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Old 07-24-04, 01:22 PM
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my hayes nine does that on my norco six it is fine the brakes are new it just needs some wearing out once you use the brakes alot it will nto rub against the pads.
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Old 07-24-04, 04:29 PM
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Originally Posted by **P.3/RiDeR{
I just got a new bike a couple days ago (04 P.3) and Ive hit the trails at C.O.P once. my front brake (8" rotor) seems to rub against the brake pads almost as if the rotors warped, but I've checked the rotor and it dosnt seem to be warped. Please help me on this. I've used the search function but couldn't come up with an answer. O ya and my brakes are Hayes HFX 9
Most brake caliper mounts have some adjustment in the position it sits over the rotor. Loosen the two 5mm bolts and squeeze the brake lever, tighten the bolts while you hold the lever. That's a quick way to center the caliper on rotor if it's a two piston type. Otherwise lift the bike so you can spin the wheel, loosen the caliper, position it so the noise stops before tightening it back up.

The noise won't do any damage providing the wheel isn't really binding badly.
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