Severe Brake Problems Please Help!!!
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Severe Brake Problems Please Help!!!
I have a 78 Ford pickup 2WD. well the other week I went about 30 miles with my parking brake up tore up everything. Brake shoes, wheel cylinders axle bearings and seals. So I replaced all this mess and my father in law said my master cylinder was weak also so we put new master cylinder on got all this put back together and I thought great now I can ride been stuck with no way to go. WRONG! Went the next day to go to the river got about 2 miles outside of town and the truck started to slow down, my brakes all 4 were locked up but when I bleed the back driver side tire all four came loose. Well my father in law said the proportioning valve had to be bad from the heat or what ever. So I got one from junk yard and put it on bleed brakes back out and my truck is still locking all four tires up but you can bleed one tire and all four will come loose... Please give me some insight to what this can be cause we dont know. Man here about to go crazy fixing to get cold and cant go fishing.....All help would be highly appreciated sorry so long but wanted to explain everything.
Thanks
Keith
Thanks
Keith
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We didnt bench bleed it we used the little hoses they give you to hook to where lines go and back inside master cylinder and mashed brake about inch or two till all air was gone. Can the master cylinder cause this??????
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From: Southern NJ
It sure can, with all four locking up, the master cylinder would be my first thought. Even with a bad proportioning valve, either the front or back usually still work. The master cylinder is the only part that controls all four at once. It definitely sounds to me that it's sticking bad. Now the cause could be an air bubble in there,, you really have to work it for a long time to make sure it's all out. Even after you have clear fluid coming out steadily. When I pulled mine back out to bench bleed it, I turned it to the four compass points during the bleed process, lo and behold,, more air. And check your plunger travel, like stepman alluded to. If it's too tight, that'll be a big problem. The only other thing I can think of is that you got a defective cylinder, marred or otherwise scratched that is causing it to hang up in the pushed position. Not unheard of with a new part. I would take it out and bleed the hell out of it,, turn it every which way and pump it a bunch of times in each position 
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From: Southern NJ
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Posting Guru
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From: peoria, az
You can determine if it is a spacer problem by pulling the pin on the linkage. Where the pedal connects to the pushrod, these two should line right up with each other. if you have to push on the rod AT ALL to get them together it is not right. When you have it together you should be able to push the pedal by hand a little before it tightens up.
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I don't know if this helps but the pedal mashes like it is supposed to until they lock then the pedal is very hard. Would there be a spacer problem now when there wasnt before the install of all the new parts????
Posting Guru
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From: peoria, az
No I wouldn't think a spacer would be a problem if there wasn't one there.
Are we working with disc here or drum all around?
I'm at a loss here. Maybe they gave you wrong master?I'll have to think harder on this one.
What do you mean by it gets harder? That the pedal has no travel?
Are we working with disc here or drum all around?
I'm at a loss here. Maybe they gave you wrong master?I'll have to think harder on this one.
What do you mean by it gets harder? That the pedal has no travel?
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Step it has drum on back and disk on front. I have already double checked the master cylinder and it is the correct one. Yes when they lock there is no travel, on pedal hard as a brick does not move.
thanks
thanks
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Junior User
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No thunder it doesnt it stays hard. Will not unlock unless I bleed one of the tires. Then it loosens a bit but not completely. I did notice while driving just now the brakes built pressure while driving and not using brakes at all on highway go figure. Hope I find the problem soon. Driving me crazy cant go 3 to 5 miles and then have to bleed brake just to get back home.
thanks
Keith
thanks
Keith
Last edited by BigDaddy29178; Sep 25, 2003 at 06:22 PM.