A few months ago, I did a rear disc conversion on my 90 Dx. The brakes were off a 92 LS. I also changed the proportion valve. I bleed the brakes and everything, but my foot goes to the floor. The car stops fine, you just have to release and get back on the brakes several times. But you only have to pump the brakes when the car is hot. Ive been bleeding the brakes atleast once a week, I usually only get a few bubbles, but the brakes still suck. Any suggestions?

 

did you change the master cylinder also?

 

No, I shouldnt need to unless I upgrade the front brakes

 

I read that the master cylinder doesn't need to be upgreaded unless, the front brakes get upgreaded also.

 

Mine does this too With and without my front brakes being bigger. (there integras now) I was using a Prelude master (15/16 compared too 13/15) and have tryed two masters, still did it. I'm gonna try going back to my dx master or swaping in a integra master and brake booster. (oh ya and yes I'm using the integra prop valve)

 

What year prelude did you use?, Im thinking the problem could be the booster itself. Please let me know what fixes it, and Ill do the same

 

I'm using an 88 or so lude master. I like it. I holds some of the time. When it does there is like half the pedal stroke then with the DX master and the pedal feels MUCH more solid. But I'm gonna try a bigger booster to see if that helps because it is a very uneasy feeling when the pedal goes to the floor

 

I know the feeling man, I always have my hand on the e-brake when slowing down, I just never know when their going to go out all the way

 

i thought when doing the rear brake conversion you should use the one of the 88-91 civic/crx si's with rear disc brakes? not sure but it sounds right to me