Drag Racing Discussions > Front Engine Dragsters

Wilwood rear disc brakes

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novadude66:
I'm having a hard time keeping my Wilwood discs on my FED released, has a 2lb residual valve and dynalite calipers. Does anyone have any suggestions?? Pulling my hair out!!!

BK:
If it happens when its cold make sure the piston in the master cylinder is returning all the way back to the snap ring every time? If it happens when its warm after a run you could have air trapped in a caliper.

Dolmetsch:
After a local racer crashed his RED twice with pad failure with his lockhearts which failed (lost a puck both times about two years apart)his wife forbid him repairing it and he sold the car to a friend. We had two other at our local track have similar failures. I do not like the set up and so did the math finding that a set of normal caliphers from a minim van had more then sufficient ability to stop the car and were a much better made piece incapable of that failure so I made asset of adapter plates to replace the airhearts, machined up two  spacers to pop in the pistons to bring the calipher and pad in proper contact with the hats already on the car. I used a ceramic hi quality pad available at  any parts store in North America. That was over 10 years ago and the car is still run regularly and has been tagged with no issues two times. He reports braking is not an issue and in fact since the change I don't believe he has ever used his laundry although maybe I just aren't always there. Pad life has been good . In fact I think they are still the ones I installed. That is how we solved a bad problem on one car. Why do you have a resid valve on disc brakes? Unless the master is along way below the caliphers (which is near impossible  on a fed or RED) a resid valve should not be installed and even then it is a bandaid at best. Resids are for drums. And they are a very misunderstood device.
don

dusterdave173:
I seem to be having similar issues--have new Wilwoods on rear , 2 lb valve, and after six runs rotors are purple--brakes work great, stop like a Caddy but....I have really looked it over and they do not seem to have any more drag than other disc setups but they don't seem to be releasing totally--hard to tell when turning everything as you can imagine--my rod is all the way out to snap ring I am sure--have hard pedal with very little travel--if I did not look at the rotors I would never know--no stinking or symptoms  that really stand out--I get a little smell after a stop in the 1/8th from 122 MPH but that would seem normal right? Car rolls around shop fine so WTH???? If I take the valve out what could be worse thing? Little more pedal travel??

wideopen231:
Seems there should be spring loaded setup to totally disengage pads. Always thought their had to be some frictional loss there. If that simple I guess somebody would have already came out with it.

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