brake question
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Senior User
Joined: Mar 2009
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From: Washington County, Penna
brake question
oj guys i have a 89 f250 with a 351 im workin on at this point... i got an issue with the brakes. if the truck is turned off it will get to have a hard pedal at half travel, once i start the truck and there is vacuum, my pedal drops clean to the floor and even if i pump it it holds but the pedal is pretty much on the floor, also from the pedal area/ booster area i get a "whoosh"ing noise.... is the booster fried??
Postmaster
Joined: Mar 2008
Posts: 2,703
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From: Des Moines, Iowa
sounds like the booster is toast... Only other thing i could think of is if you didn't bleed the system out well enough and have air in the lines... but that doesn't fit the symptoms as well... might want to rebleed just to check... remember to do it in correct order too.. rear pass side, rear driver side, front pass side, then front driver side...
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Senior User
Joined: Mar 2009
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From: Washington County, Penna
would putting a brake booster on from a truck that was under 7000 gvwr hurt a truck that is supposed to have the over 7000 gvwr booster, cuz its what i had, so i put it on, and no more whooshing noise, but the pedal nearly hits the floor before it starts to grab, i would guess the booster is just going to make it easier, and my problems probably lies in the pads themselves or air in the lines, what do you all think
Postmaster
Joined: Mar 2008
Posts: 2,703
Likes: 7
From: Des Moines, Iowa
would putting a brake booster on from a truck that was under 7000 gvwr hurt a truck that is supposed to have the over 7000 gvwr booster, cuz its what i had, so i put it on, and no more whooshing noise, but the pedal nearly hits the floor before it starts to grab, i would guess the booster is just going to make it easier, and my problems probably lies in the pads themselves or air in the lines, what do you all think
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
If none of the lines have been disconnected recently the problem is probably rear brake shoe adjustment, you want the shoes to be as close to the drum as possible without touching. But obviously if any of the lines have been disconnected a full brake bleed will be necessary as well.
Postmaster
Joined: Mar 2008
Posts: 2,703
Likes: 7
From: Des Moines, Iowa
If none of the lines have been disconnected recently the problem is probably rear brake shoe adjustment, you want the shoes to be as close to the drum as possible without touching. But obviously if any of the lines have been disconnected a full brake bleed will be necessary as well.
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