brakes (not working).
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From: GANS
brakes (not working).
got a problem.
almost everytime i use my brakes, the brake light comes on, and the rear brakes quit working.
when the truck is off, the rear brakes seem to work.
now, the other thing is, the brake pedal doesn't come up to be even with the clutch (which on my other truck it was pretty close). it seems like an inch or so off. when I pull the pedal the whole way up, the rear brakes, the brake light goes off, and the rear brakes start working. however, if i use it for a while, the light comes back on until i pull the pedal back up.
I've replaced almost every brake line on the truck. the guy before me replace the vacuum booster and master cylinder. the brakes in the rear work, and they go back into position when you leave of the pedal.
any clues? is the master cylinder&booster out of adjustment??
almost everytime i use my brakes, the brake light comes on, and the rear brakes quit working.
when the truck is off, the rear brakes seem to work.
now, the other thing is, the brake pedal doesn't come up to be even with the clutch (which on my other truck it was pretty close). it seems like an inch or so off. when I pull the pedal the whole way up, the rear brakes, the brake light goes off, and the rear brakes start working. however, if i use it for a while, the light comes back on until i pull the pedal back up.
I've replaced almost every brake line on the truck. the guy before me replace the vacuum booster and master cylinder. the brakes in the rear work, and they go back into position when you leave of the pedal.
any clues? is the master cylinder&booster out of adjustment??
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From: Virginia
Was the master cylinder bench bled before it was put on? And have you bled the lines really good?
I had a co-worker just replace a rusted line about midway on his frame, and then afterward, didn't have hardly any brakes and the light was on. He said he bled the brakes, so we plugged the master cylinder lines, and he had good pedal. So we knew it had to be air still in the lines. A couple of days later he got time to bleed them, and after a lot of fluid on the floor, he said it finally gave a big burp, and he has had brakes ever since.
I had a co-worker just replace a rusted line about midway on his frame, and then afterward, didn't have hardly any brakes and the light was on. He said he bled the brakes, so we plugged the master cylinder lines, and he had good pedal. So we knew it had to be air still in the lines. A couple of days later he got time to bleed them, and after a lot of fluid on the floor, he said it finally gave a big burp, and he has had brakes ever since.
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From: GANS
I don't know if the master was bench bled or not, it was on there b4 i bought the truck, along with the vacuum booster. I do know that I have good brakes when the truck is off. (no vacuum on the booster). I was driving it yesterday, and I pulled the brake pedal out a couple of times, and it worked perfectly. great pedal and good brakes. I bled the brakes out real good, several times.
I am thinking is maybe the vacuum booster is messed up. The reason why I am thinking this is because when I got the truck, I pushed on the brakes a bunch of times and water came out of somewhere everytime i pressed the brake. (it was water, not brake fluid). it quit doing it after I did that for a while.
it just seems like the drum brake chamber in the front of the MC isn't getting enough fluid, since the pedal isn't coming the whole way back.
if it keeps doing this, I am going to swap out the booster with one from my other f-150 (when I swapped the cab onto my f-250, i swapped the the f-250 booster and bought I new MC), and see if that does anything.
I am thinking is maybe the vacuum booster is messed up. The reason why I am thinking this is because when I got the truck, I pushed on the brakes a bunch of times and water came out of somewhere everytime i pressed the brake. (it was water, not brake fluid). it quit doing it after I did that for a while.
it just seems like the drum brake chamber in the front of the MC isn't getting enough fluid, since the pedal isn't coming the whole way back.
if it keeps doing this, I am going to swap out the booster with one from my other f-150 (when I swapped the cab onto my f-250, i swapped the the f-250 booster and bought I new MC), and see if that does anything.
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Joined: Oct 2003
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From: boston
I have an 86 f150 with recent brake work when i bought it. However, the rear brakes did not work. It turned out to be the brake proportioning valve, located below the master cylinder...follow those 2 squiglly brake lines coming out of the master cylinder to a brass valve body. That could be your culprit.
Let me know how you make out
Let me know how you make out
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From: GANS
I'm getting ready to rip into it again. I think that the booster might be rusted up enough to keep it from returned. I am going to take off the MC. The next curpit search will start at the MC & proportioning valve..
btw, what did you pay for a new valve?
btw, what did you pay for a new valve?
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From: boston
I paid for it with a plant I grew....i work at a large nursery (the tree and shrub kind)....i had a customer ask me for something my employer did not have and i did...i swapped the plant for scavenging rights to their boneyard......the old one can be rebuilt....
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From: GANS
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From: boston
after reading your e mail about the pedal not coming back up, and not knowing very much about the mechanics of the pedal mechanism (and not having looked at my own truck), i was wondering if there is a return spring of some sort that pulls or pushes the brake pedal back to its resting position, or is that a function of the master cylinder (which seems a lot more likely)
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