I recently did a rear disc brake swap on my 96 ek hatch with a b20b and I have no brake pressure. The trailing arms are off a 94-00 integra. I bled the brakes and even replaced the master cylinder, brake booster, and even the prop valve. I get fluid to the rear calipers and can see that the calipers push on the pads to make contact with the rotors but the brake pedal still goes to the floor. I looked pretty much everywhere on here to see if anyone has had the same issue but didn’t find a solution for this. I don’t have any leaks.

When it did have the drums on the rear you would have to pump the brake pedal in order to build pressure but ever since the rear disc swap the pressure was just non existent.

The master cylinder, brake booster, and prop valve are for a 96 civic ek which I thought would work with the rear discs but I’m not sure anymore. Not sure if the civic being an auto to manual swap could be a cause.

Anybody know what may be wrong?

Thanks in advanced.

 

Ebrake works?

 

Yeah e brake works

 

A bad master cylinder can act like that. Internal piston seal can leak fluid back to the master cylinder.

 

I’ve replaced the master cylinder when I first got the civic which was about a year ago cuz I’d have to press the brake pedal a couple to build pressure when I had the drums on them. When I did the rear disc conversion there was no pressure so I went and got another master cylinder and still nothing. I’m convinced it isn’t the master but then again my friend told me that some come defected with that internal leak you’re talking about. The master is from Autozone. You guys think I should just get an OEM one?

 

Sounds unlikely, but the pressure has to be going somewhere. If your certain there's no air in the lines, or leaks, then warranty on the MC may be the next logical choice.

 

Have you tried bleeding with a vacuum bleeder?

 

Yeah I just ordered a new MC hopefully it’ll solve the issue.

 

Yeah I got all the air out but brake pedal would still go to the floor. If this new MC doesn’t fix the problem I don’t know what will.

 

Did the MC do the trick?