new m/c and bb... pedal still goes to the floor, WTF?

old_blue

15 Year Member
Nov 3, 2003
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Whole car is about to go into the trash. 5 lug conversion was going great until it came to bleeding the brakes. I have never had soo much trouble bleeding the brakes. I get solid fluid to all four corners. I just replaced the brake booster and m/c and the pedal still goes to the floor..... I am about out of ideas. Giving up for tonite. I don't know where the air is hiding but I am obviously not getting it out or something else major is wrong. any ideas?
 
did you replace any lines.. if so there is going to be alot of air. bleeding brakes isnt fun and can take a while sometimes. you just have to keep doing it until you have pedal. you could have a leak but that would be pretty obvious.
 
Did you bench bleed the new mc first?
Is the booster pushrod set up properly?

If your getting solid fluid at all 4 wheels with no air,it could be a defective mc.

What parts are you using?

:shrug:
 
I don't know if the rod is set properly or not. I have about 1/2" to (maybe) 1" of travel in the pedal. I dont know if that would be my problem though. I spent the better part of today with the pressure bleeder (piece together from homedepot) and it didn't really push too much fluid like I thought it was going to. Just a slow drizzle and the PSI never dropped once I pumped it to 10 psi. Doesn't sound right to me. I am beginning to think that maybe I didnt gut the stock proportioning valve totally. How many pieces are in there? maybe I didn't get it all out....... I can't think of anything else. Either way I dont think the pedal should be going to the floor.

My next step is to take it to a shop and have them bleed it for me. See if they have any luck.
any more suggestions. And yes I bench beld the mc.
 
how much preload am I looking for? should there not be any play in the rod length? I have been to that site and my only real concern is that (1.) I may not have gutted the stock pv completely. I maybe have left a small piece in there. I know I got the rod and the spring but I don't know if there was more than that. (2.) there is air in the lines that I am not getting to. WHen I used the make shift pressure bleeder I have it up to 10 lbs of pressure and it just stayed there the whole time even after I opened the line and let fluid out it never dropped below 10psi and the fluid came out at a slow drizzle. Never shot out or anything like it was even under pressure.
 
8950HO said:
Did you bench bleed the new mc first?
Is the booster pushrod set up properly?

If your getting solid fluid at all 4 wheels with no air,it could be a defective mc.

What parts are you using?

:shrug:
oops I forgot to answer your question:
I am using a 93 cobra brake booster, 95 gt master cylinder, 99+ pbr front calipers, 96 rear calipers, a wilwood proportioning valve. The only parts that are not brand new are the rear calipers. Everything else has been bought brand new.