Brakes 1985 Mustang Front Cobra Brake Conversion


New Member
Jul 22, 2014
Hey everyone. I have a 1985 notchback. Previous owner swapped brakes from a 1992 5.0 onto this and now I’m doing a 5 lug cobra conversion. I’ve done the fronts and then had to take the car to a shop for some work. By the time I get it back I don’t think I’ll have enough time to do the rears before an HPDE event I want to go to. I have the 93 booster and master cylinder kit from lmr. My booster is bad so I was going to go ahead and swap it. Can I convert to the cobra parts and then just not gut/plug the proportion block since I’ll still have the drum rear brakes? If not what would I need to do? Just replace stock booster for now?
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I’d you still have rear drums do not swap the MC. Running rear drums with a 4-wheel disk brake MC will result in a very firm pedal. Just run the MC you have for now.

I would still gut the stock prop valve and run the adjustable, but probably not critical at this point.

Be careful with the 93 cobra booster now however. May result in some very overboosted brakes.
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