I have two wheelsets one set with mountain tires and cassette and the second set with road tires and a road cassette. The bike is using disc brakes (Hayes hydraulic HFX-9). When the second wheelset was installed on the bike I noticed that the rotors were rubbing on the pads. I was told that I have to recalibrate the pads each time I swap wheels or either shim the rotors. The problem is that I don't know how to do either of those and now something that was supposed to be a simple thing to do is getting complicated. Since I will be swapping wheels no less that twice weekly, probably more, I prefer to shim the rotors but it seems like both pads are rubbing in the rotors. Can you please help me explaining exactly how to shim the rotors or at least how you calibrate the Hayes brakes?
I know that I will probably run into problems with the road cassette but for now I need to solve the brake problem.
the road cassette shouldnt prove too much trouble, in fact i have heard of DH racers using a single chainring, road cassette and a road rear derailleur on their bikes to cut down chain slap
as for the brakes, i don;t think you can really recalibrate the hayes brakes apart from rebleeding them and thats a huge hassle ad not something to be done often
the only solution is to shim either the rotors with some super thin washers or move the whole caliper unit with the same sort of washers
you might want to talk to a decent bike shop about this
Originally posted by ciclistaloco I have two wheelsets one set with mountain tires and cassette and the second set with road tires and a road cassette. The bike is using disc brakes (Hayes hydraulic HFX-9). When the second wheelset was installed on the bike I noticed that the rotors were rubbing on the pads. I was told that I have to recalibrate the pads each time I swap wheels or either shim the rotors. The problem is that I don't know how to do either of those and now something that was supposed to be a simple thing to do is getting complicated. Since I will be swapping wheels no less that twice weekly, probably more, I prefer to shim the rotors but it seems like both pads are rubbing in the rotors. Can you please help me explaining exactly how to shim the rotors or at least how you calibrate the Hayes brakes?
I know that I will probably run into problems with the road cassette but for now I need to solve the brake problem.
I will appreciate your help.
Pick up a Hayes manual. All this stuff is detailed pretty well there. You can reset the pads by gently pushing the pistons back in with a lark flat headed screw driver. In order to adjust them, reset the pistons, loosen the two bolts so the caliper is free slide sideways. Make sure the wheel is properly installed and sitting all the way into the dropouts. Squeeze the brake lever and pump it up until it stiffens up and hold it firmly. WIth the lever held down and the caliper biting on to the disc, now tighten the two bolts and it should be centered correctly.
Originally posted by xavier Same set of brakes on both bikes? If so I do not see the problem.
Set up the brakes on both bikes. That means moving th ecalipers over until you get it to clear.
Not very hard to do. That is why calipers come with all those washers.
Its the other way around, one set of brake for two wheels. The rotors need to be aligned exactly the same or the calipers readjusted for each wheel. Hayes brakes don't use shims, they use the 74mm manitou style post mount for both front and rear which slides the caliper side to side.
Originally posted by ciclistaloco I have two wheelsets one set with mountain tires and cassette and the second set with road tires and a road cassette. The bike is using disc brakes (Hayes hydraulic HFX-9). When the second wheelset was installed on the bike I noticed that the rotors were rubbing on the pads. I was told that I have to recalibrate the pads each time I swap wheels or either shim the rotors. The problem is that I don't know how to do either of those and now something that was supposed to be a simple thing to do is getting complicated. Since I will be swapping wheels no less that twice weekly, probably more, I prefer to shim the rotors but it seems like both pads are rubbing in the rotors. Can you please help me explaining exactly how to shim the rotors or at least how you calibrate the Hayes brakes?
I know that I will probably run into problems with the road cassette but for now I need to solve the brake problem.
I will appreciate your help.
Are both wheels centered? Can you shift the centering of the offending wheel by shimming the axle spacing? DO THIS ONLY IN THE DIRECTION OF IMPROVED WHEEL CENTERING. If not, get the Hayes instructions and see how to align the rotor such that it is in identical position for both wheels. Then check the caliper alignment. Manual is available on line at the Hayes site, URL: http://www.hayesdiscbrake.com/pdf/45-14550BEnglishForWeb.pdf
