Brake/Vacuum problems?
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Brake/Vacuum problems?
Hope someone can help. I have a 1989 F350 XLT Lariat 7.3,The brake pedal when touched wants to be taken away from my foot by the vacuum, But if i try to apply right away again the brake pedal is hard as if no vacuum.If I sit at the stop holding the brakes and take off quickly the tranny won't shift correctly. If i take my foot off the brake and let it idle for a few seconds it seems to build up vacuum and tranny works right.
I figured the vacuum pump was going out so for the price I threw one at it,No change. I am guessing the Booster is bad or going bad.Check valve is good and I can't find any obvious leaks.
Has anybody had these issues and does anybody know what may be going on,hopefully I don't have to keep throwing parts at it and find out a few hundred dollars later it was just a 20 dollar part.LOL.
Thanks in advance for any help you guys can provide.
I figured the vacuum pump was going out so for the price I threw one at it,No change. I am guessing the Booster is bad or going bad.Check valve is good and I can't find any obvious leaks.
Has anybody had these issues and does anybody know what may be going on,hopefully I don't have to keep throwing parts at it and find out a few hundred dollars later it was just a 20 dollar part.LOL.
Thanks in advance for any help you guys can provide.
i ain't rite
Joined: Mar 2005
Posts: 65,564
Likes: 5,601
From: Marlboro Mental Hospital.
welcome to FTE.
do you have a vacuum gauge you can put in the line to do tests?
while it sucks you paid for a vacuum pump that did not fix the problem, at least you now know you have a good pump in the truck.
it may be a bad booster, or it could also be a bad reserve canister. or a split line.
what i would do is hook a vacuum gauge in the system starting either at the pump and work your way forward until you loose vacuum, or at the booster and work your way back to the pump until you hold vacuum.
do you have a vacuum gauge you can put in the line to do tests?
while it sucks you paid for a vacuum pump that did not fix the problem, at least you now know you have a good pump in the truck.
it may be a bad booster, or it could also be a bad reserve canister. or a split line.
what i would do is hook a vacuum gauge in the system starting either at the pump and work your way forward until you loose vacuum, or at the booster and work your way back to the pump until you hold vacuum.
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Update.
I went ahead and borrowed a gauge and tested the vac. lines. Found that when I applied the brakes the vacuum would completely dropped to zero for as long as the brakes were applied and would build back up when released.
I found a broken plastic nose cone on the booster, New booster took care of it,all good now.
Thanks for t5he help.
I went ahead and borrowed a gauge and tested the vac. lines. Found that when I applied the brakes the vacuum would completely dropped to zero for as long as the brakes were applied and would build back up when released.
I found a broken plastic nose cone on the booster, New booster took care of it,all good now.
Thanks for t5he help.
i ain't rite
Joined: Mar 2005
Posts: 65,564
Likes: 5,601
From: Marlboro Mental Hospital.
no idea on the shirt, i found it as a picture on the internet back when all the black lives matter crap started and felt it was appropriate to the truth of the matter instead of the crap all-fo-me shapton was spewing.
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