Brake problem again!
Laughing Gas
Joined: Jul 2007
Posts: 900
Likes: 1
From: Cross Lanes, WV
Have you adjusted the rear brake shoes up by jacking the truck up with the drums and wheels on the truck? Roll wheel, adjust shoes up with spoon through back of dust cover till u feel slight resistance. Then bleed,,
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Postmaster
Joined: Nov 2009
Posts: 4,556
Likes: 0
From: Crapy southern New Jersey
Yes the MC was bench bleed. I will check the rear brakes again and rebleed. Also going to check that vaccum and see what it pulling. Should be about 20 psi at idle right. Lastly I picked up a new master cylinder not a remaned. Will see how it goes tomorrow or Wednesday.
Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
Cody, rubber duck, talked about a vaccum booster that would not bleed off. PM him, I can't remember what's it called. I had this problem once but after driving it and bleeding it several times it finally quit.
Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
You mean you tried to PM Cody and it wouldn't let you?? I think the boosters name had a 'zero' in it. I'll try to PM him if you want.
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i ain't rite
Joined: Mar 2005
Posts: 65,561
Likes: 5,595
From: Marlboro Mental Hospital.
i think you have a bad master cylinder Doug.
i had to put 4 of them on the 88 before i found a good one.
remans are crap any more because quality control is in the toilet.
they do not do a very good job flushing the units after boring the piston hole, and there is all kinds of crap left in the hole. so when they put the piston in and you try to bleed it the piston seals get tore up almost instantly letting the fluid bypass the piston.
i had to put 4 of them on the 88 before i found a good one.
remans are crap any more because quality control is in the toilet.
they do not do a very good job flushing the units after boring the piston hole, and there is all kinds of crap left in the hole. so when they put the piston in and you try to bleed it the piston seals get tore up almost instantly letting the fluid bypass the piston.
Hotshot
Joined: Jul 2008
Posts: 11,231
Likes: 130
From: Thomasville, GA
You could convert to hydroboost, get rid of the vacuum brakes all together... just a thought.
Getting reman parts from Autozone it would cost you about $250 for the hydro unit, steering pump (if you wanted the one with 2 return hoses), and the two pressure lines.
Getting reman parts from Autozone it would cost you about $250 for the hydro unit, steering pump (if you wanted the one with 2 return hoses), and the two pressure lines.
Posting Guru
Joined: Nov 2003
Posts: 2,214
Likes: 0
From: THUNDER BAY
I think that you either still have air in the system or like just mentioned you have a bad MC .
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Postmaster
Joined: Nov 2009
Posts: 4,556
Likes: 0
From: Crapy southern New Jersey
So I pulled a vacuum test today 45psi at an idle on the line to the cab control. Brand new master cylinder and still the pedal goes to the floor. I cap the master cylinder and the pedal was rock hard. So I add just front brakes and the pedal when to the floor again. The rear was still caped. This is what I have so far still working.