Problems with my rear disc conversion

[jbdakid]

I did my conversion using 99 Civic Si parts. Rear trailer arms, calipers and e-brake cables off of a 92 Si hatch. My car is a 92 Civic CX hatch. Everything fits and bolts up. I bled the brakes but I can only get a little pressure on the peddle. Not enough to stop the car? When the car is off, I get full pressure though and the brake peddle pumps all the way up. What am I missing?

Thanks.

 

[TurboMirage]

i would bleed them again... starting at the furthest from the MC to the closest, and do all four.

 

[shesfromthefire]

I'm having similar issues I'm going to rebleed all my lines, if that doesn't work I'm going to replace my master cylinder. I have to anyways.

 

[jbdakid]

i would bleed them again... starting at the furthest from the MC to the closest, and do all four.

Thanks for the suggestion, I went back and bled all four corners again and it got better but still not what it was. I'm assuming it should be much better now that I have discs in the back, but I think I'm going to change the Master cylinder. Like I said, I have a 92 CX hatch and my rear disc come off of a 99 SI, what master cylinder should I get? One from a 99 SI, one from an Integra? Which Integra, a DC or a DA? Thanks for the help.

 

[phunky.buddha]

If you get an Integra master cylinder, get a DC- but make sure the mounting tabs line up. I used a DC master in my 95 (same generation as yours) and it wouldn't bolt up to the booster, so I swapped over the entire master cylinder and booster at the same time from the donor Integra.

 

[jbdakid]

If you get an Integra master cylinder, get a DC- but make sure the mounting tabs line up. I used a DC master in my 95 (same generation as yours) and it wouldn't bolt up to the booster, so I swapped over the entire master cylinder and booster at the same time from the donor Integra.

I really don't want to change both, do you know which MCs will just bolt up and get me more pressure?

 

[phunky.buddha]

I really don't want to change both, do you know which MCs will just bolt up and get me more pressure?

It's not too hard to change both... but 90-91 Civic EX will be the largest one in the stock mounting bolt pattern (I think) at 15/16". I'm pretty sure there's either an Accord or Prelude master that will work too, but I've not researched too deeply into those since I never had to use one.

 

[m90polk]

Why dont u get the correct proportioning valve instead of the master cylinder .....that is what ur supposed to do to get the right pressure to the front and rear

 

[jbdakid]

It's not too hard to change both... but 90-91 Civic EX will be the largest one in the stock mounting bolt pattern (I think) at 15/16".

This turned out to be money!! The difference is so big, I should have changed this MC even before I put the discs on the rear. It really feels way better!!! Car stops really good now. I'll probably change the prop valve when I get Integra front brakes, but for now this is already much better braking.

Here's a picture for anyone who has the same question. My Civic CX came with the one on top which a 13/16" MC and the 91 Civic 4 door EX MC which is 15/16 is the one on the bottom. All of the bolts match perfect.

 

[phunky.buddha]

This turned out to be money!! The difference is so big, I should have changed this MC even before I put the discs on the rear. It really feels way better!!! Car stops really good now. I'll probably change the prop valve when I get Integra front brakes, but for now this is already much better braking.

Here's a picture for anyone who has the same question. My Civic CX came with the one on top which a 13/16" MC and the 91 Civic 4 door EX MC which is 15/16 is the one on the bottom. All of the bolts match perfect.

Welcome. Glad it worked out for you!