brake booster replacement
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Tuned
Joined: Feb 2016
Posts: 281
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brake booster replacement
It appears the brake booster on my 1078 F100 is shot and is causing the truck to come out of gear when brakes are applied, etc.
If I am replacing the booster, should i go ahead and do the master cylinder as well?
If I am replacing the booster, should i go ahead and do the master cylinder as well?
Lead Driver
Joined: Apr 2011
Posts: 6,399
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From: El Dorado, Arkansas
A photo of the MC/booster would clarify exaclty which booster type it is.
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Tuned
Joined: Feb 2016
Posts: 281
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No mention of what the engine and transmission is and what type of brake booster. If the MC has ever leaked between the MC and into the booster, this would break the booster diaphragm down and cause a vacuum leak and poor brake operation.
A photo of the MC/booster would clarify exaclty which booster type it is.
A photo of the MC/booster would clarify exaclty which booster type it is.
aside from being stiff(has been since first bought) the brakes work fine..but when you apply the brakes and come to a stop, it takes the truck out of gear. The vaccum lines look ok, so i assume the booster is shot...i will likely just buy a new booster w/ a new master attached.
More Turbo
Joined: Jun 2015
Posts: 534
Likes: 27
From: North Texas
I'm not sure how a brake booster can cause the transmission to slip out of gear. Those don't have a direct relationship to each other. Maybe the braking motion is causing the shifter (worn?) to move...
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Tuned
Joined: Feb 2016
Posts: 281
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Another member gave me the idea...there is a main vacuum line going from the booster to the vacuum tree behind the manifold....i guess if the diaphram in the booster goes bad it can leak off that vacuum. Sounds weird, but it is the only time the truck comes out of gear.
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Caleb H
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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78custom
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