Does any one have a list or know of the top of there head what parts i will need to convert my 73 comets frount drums to disk brakes PS i need to know every part i will need to compleate the job i plan to go get all the parts in a few days and dont really wana stop to get a part... oh yeah theres a 77 comet in a auto wrecker that has fount disk would that work THNX
Here is a link to an article that was written, this should answer most of your questions. Also, the topic has come up quite a bit, so you could always do a search on the this board. Good luck! http://www.geocities.com/cping3/frontdisc.html
You should give consideration to the correct master cylinder such as the one in the 77. It's bore size is different for disc use. You need to rework the front hose connection positions because the new hose won't be mounted in a desirable position for long term reliability. The fittings to use that master are also different thread size. from that of drum system on purpose, from the factory, so parts could not be interchanged. Ccntrol valve put into the line to the rear should be done so a balance can be made if the rear locks up before the fronts or the fronts to more braking that the rear. You will be doing some testing, break in etc. before it is all done. Already been there on a 73.
bluegrass,i'm doing the same swap on my 70 mav.(disc spindles from a 77 granada)are you saying you should use the m/c from the granada?my donor granada is p/b and my mav is no power brakes.will the granada power m/c work in place of a non power setup?.or will mods have to be done to the rod?thanks chuck.ps looks like i have to go back and get the prop.valve!
The master should be from the Mav or Comet with disc fronts. The granada won't work as far as I know. The difference between the drum and disc master is the size of the internal piston as well as the physical demensions are a little different but will still bolt up to the fire wall. The piston in the disc master is smaller in diameter. This produces more pressure to operate the calipers. May not sound right but a smaller piston produces more pressure per sq. in. of surface area but also requires more leg power to make it happen.
Even though its not the correct one, I have been using the stock 4 wheel drum set up, including master cylinder, on mine for years with disc on the front. It works fine with minimal leg pressure and doesn't lock up the rear wheels at all on a panic stop (I tried it). Only thing I needed was the spindles & hardware. Also get the calipers for cores. Then buy new bearings, grease seals, rotors, (if the donor ones are good you can use them), pads, calipers, and hoses. Only thing to watch is if you drive the car alot. As disc pads wear, the fluid level in the reservoir will go down and your reservoir will not hold enough fluid to compensate for a complete wear of pads.
