82mazdarx7

I have just finished my 5 lug conversion with the 4 pot front calipers. Problem is i cant seem to get my pedal to be stiff. I have bled the system starting with the master cylinder then the rear then the front passenger and finally the front driver side twice now. And still the pedal just goes right to the floor. I pit the ss brake lines from a 89 in the front, but dont think thats the problem. Does anyone know what it can be. I only have about a week till seven stock so I need to get these brakes working ASAP!!!!!

Thanks,

Brad

82mazdarx7

just bled the system again, nothing

82mazdarx7

update..... I just bled the system two more times, and still the pedal goes to the floor. Whats weird is the peadal feels different when I bleed the back brakes. It feels a little stiff and the in will go to the foor after about 3/4 of the way down???? then when I bleed the front the pedal feels different, It will just go to the floor, no resistance. My question is, Could it be the master cylinder. It was fine before I did the 4 pot conversion. Can the power brake booster go bad? I dont think its that because that only helps when the car is running because its vacume fed? Please any suggestions......

RXnos1200

iTrader: (24)

Does your 7 have rear disc brakes too or are they drum brakes? Check under the dash and see if your m cylinder is bleeding out where the brake pedal shaft goes into. If you have drums then maybe a wheel cylinder is leaking. You'd have to take off the drum to make sure though.

82mazdarx7

I swaped out the rear end from a 84 so it has disc brakes, No leakes. The master cylinder was fine befor the conversion

82mazdarx7

did i mount these brake lines right???

GavinJuice

ya thats right, whats the blue **** on the pads? brake quiet?

rxtasy3

iTrader: (2)

just how did u bleed the m/c? u'll probably need to check for air in the system at all the line connections, including the proportioning(sp) valve. u do know that the m/c for disc rear is different than one for drum right?

82mazdarx7

those are the springs for the pads, it forces them out when the brakes are not applied so the dont rub constantly

82mazdarx7

the master cylinder has a bleeder screw on the bottom of it. I checked all the connections, they are all tight. Could it be the master cylinder even though it is not leaking. I dont know what else to check

Maitlandtron

Wait, I was told in another thread that the master cylinder for drums is the same for disc. You can bleed the master cylinder by loosening the brake lines at the master cylinder, right?

82mazdarx7

Dont know, it says in the manual that there is a bleeder screw on the side, mine is at the botom, any hints on what it could be. Im thinking it has to do with the front because i changed them

dbragg

iTrader: (7)

i did this install on my SA. the car hadnt been driven in years. it has a GSLSE rearend. i added an SE master cylinder and an SE proportioning valve. i have hard pedal feel. i had initial problems with my prop valve being bad, but you shouldnt have that as yours worked before.

pressure has to be being built up.
so youre not leaking any fluid?
is your fluid level staying the same?
when you installed the front brakes did you total bleed the whole system?
when you bleed are you getting brake fluid out of the bleeder screws?
describe your process for bleeding, just to get that out f the way.

id go ahead and get an SE master cylinder. i have heard though that a lot of them are the same, but i havent personally ran part numbers.

82mazdarx7

I am not leaking any fluids, Level in the master cylinder is staying the same, I had all brake lines at the wheels disconnected for a week so the system was open for that time, the fluid in the master cylinder was drained. But i have bled the system several times and nothing but clear fluid is coming through with no air. Fluid is comming out of all bleeder screws. I am bleeding the master cylinder first then the pass rear then the driver rear then the pass front the the driver front. I have been looking at new master cylinders. Could the brake booster be bad? What year should the master cylinder be. the rear end is a 84 disc so I was lookinf at a 84 master cylinder for rear disc, would that work

dbragg

iTrader: (7)

i dont know how to check the booster. the year for the MC doesnt matter, just get SE, if theirs a difference.

are you pumping the pedala set number of times then holding it to the floor while you release pressure from the bleeder screw? you have someone helping you right? if youre doing that, when you turn the bleeder screw does the fluid just run out or shoot out?

82mazdarx7

I had someone helping me, but i have been doing it the past few times with a one man bleeder kit, It works pretty good. the fluid shoots out. If it was the master cylinder, wouldnt it not come out at all or really slow. the weird thing is when i bleed the rear the pedal feels stiff for about half way then it goes to the floor. when I bleed the front, the pedal is soft and doesnt get any harder. thats why i think there is something wrong with the front. could there be a problem with the calipers. The guy i bought them from saiud they were only a year old.