mlawhun0114n011

Just this week i converted my 94 civic ex to full oversized disc brakes from a 94 integra. Everything bolted right up but ive bleed and bleed the brakes and the pedal is still super mushy to where it almost goes all the way to the floor. Is there anything else i should do or what i need to do?

pityocamptes

How are you bleeding the brakes?

mlawhun0114n011

Getting someone else to pump the brakes while i loosen the 10mm bolt on each caliper.

pityocamptes

Are they holding the pedal down, before you crack the bolt and while you have the bolt cracked open, only releasing after you retightened the bolt? Best option is to bleed them via a vac pump method. A lot easier in my opinion.

mlawhun0114n011

yeah i dont have access to one of those but yeah he'll pump them till the pedal is hard and keeps it pressed until i tighten the nut. The pedal wasnt like this until i changed these out.

ritesh

maybe a hose is is damaged or night fastend properly,.
i had this problem the hose was damaged.

98civdx

The integra brakes are not oversized, they are the same. The only difference is the piston in the integra caliper is larger. Did you run the DC MC?

Are you bleeding them in the correct order?

mlawhun0114n011

whats the DC MC? and order i was doing them in was starting form right rear, left rear, right front, then left front.

B18CivicEJ8

DC means Integra, it's the letters in the VIN that tell you what car you own and what generation. But to clarify, you need a 15/16 Master Cylinder (MC) and brake booster from an Integra. The one you have is 7/8.

98civdx

Correct, but IIRC you don't need to swap the booster.

mlawhun0114n011

so i do need the 15/16 master cylinder but not brake booster? or do i need to get the booster?

98civdx

You need the master cylinder, not the booster....


Before you go buy, search to insure you are getting the correct master cylinder, and it will bolt up without modification to the lines.

mlawhun0114n011

alright... appreciate the info from everyone.

jbpnoman

Strictly speaking, you don't need either. Upgrading to the 15/16" BMC will give better brake response, but the 7/8" can still flow enough fluid to do the job and make the car stop safely.

BC_Garage

^^Yes just did a Dc front brake conversion on our 6th generation CX and we are using the stock master cylinder and brake booster. That should not be a problem. Make sure there are no leaks in the line.

jerimrc

did you lose brake fluid that it emptied the brake master cylinder? if so, you have to bleed the master cylinder.

mlawhun0114n011

we've tried both bleeding form the calipers and at the two lines coming off the master cylinder too.... ive read other forums theres so many ways people do this conversion i dont know what the right or wrong way is.... i hear i need a 4040 prop valve off a newer model civic that has all wheel disc brakes from factory, i hear this way on this thread, and many others..... so to sum things up, what do i need to do to get this brake pedal not mushy?

jbpnoman

You should check your prop valve to see what kind it is. You don't always need to replace it. You also need to BLEED YOUR BRAKES. I know you said that you already did. Do it more. Do it again. Keep doing it until the brakes aren't mushy. Get a service manual, and make sure you do it the right way. Make sure you don't let the fluid in the reservoir go below the MIN line. The only reason your brakes would be mushy is if either there is air in the lines, or your lines are FUBAR. While you're bleeding, whoever is handling the bleeder screw needs to keep a close eye on the lines and look for any leaking, dripping, or squirting. Jack up the car, and look at the hard lines. Look at the BMC and BB, make sure none of those lines are leaking.

You have air in the system. The wrong prop valve would not cause mushy brakes.

98civdx

Right rear, Left rear, right front, left front.

WheelPowerRacing

had a friend who had this same problem. Bled brakes correctly multiple times, changed fluid color to make sure we were getting fresh fluid thru all the lines, etc. Finally discovered he had put the left front caliper on the right side, and the right front caliper on the left side. The bleeds were then located in the wrong place & you never could get all the air out. Something to check.

jbpnoman

You don't need a degree in fluid dynamics to know that the bleeders go on TOP of the calipers. Also, every Honda caliper I've dealt with has had R and L engraved on them in HUGE block lettering.

Libertariat

Beat me to it!