Bicycle Mechanics - Disks frustrating me, this normal?

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romeofoever
08-07-03, 04:10 PM
i recently installed hayes HFX-9 disks on the front. i have a 98 marzocci Z1. first of all the mounts didnt fit so i had to machine it. secondly, while breaking them in they were rubbing, i dont know if it will automatically adjust. and after a steep downhill, they lost power alltogether and the disks started to warp. is it cause i have 6" disks or can it be from improper spacing? :confused:

urbanking
08-07-03, 05:34 PM
The mount saounds like an issue... was it the proper model? They do vary.
dirtbikedude
08-07-03, 07:12 PM
The '98 Z1 have an old style mount. You need to purchase a bracket for it (about $15).

The fact that you rotor started to warp leads me to believe you are heavy on the brakes causing them to over heat which in turn wil over heat your brake fluid and you will loose just about all of your braking power.

Also, if you did not machine your mount just right the caliper could be crooked causing constant rubing and again, heating every thing up to the point your brakes will not work.

:beer:

Rev.Chuck
08-07-03, 08:51 PM
If you got it hot enough to warp the rotor, the pads are probably damaged. You need a larger rotor for better cooling.
The mechanical brakes are not self adjusting.
BAC5.2
08-07-03, 09:19 PM
HFX-9 means Hydraulic. HMX-9 is Mechanical.

Hayes brakes are self centering. Un screw the bolts that bolt it to the adapter, slide a business card on either side of the rotor, under the pads. Clamp the brake hard and wiggle the brake and rotor. Keep the brake lever held down and tighten down the bolts to torque spec.

The warping is more of a spacing issue.

I have an 8" Hayes Purple (2002, pre HFX series) and on a 40+mph road downhill, I had no problems with stopping. No powerloss, no nothing. My brakes DO dissipate heat better than your's do (larger rotor + the higher content of Zinc in my caliper body), but if I experience no fade or problems of any kind on the 3 mile long downhill, I would hardly expect you to have problems.

Take it to your LBS and have them check it out. You might have the Resin pads (not uncommon) and they simply may have glazed over. Get some EBC Gold Stuff pads and try your luck again.