Question about 1992 Ford F350
It's possible that it's the booster. A quick test is to remove the large vacuum line that hooks to the front/side of the booster, have someone plug the end of the vacuum line temporarily, and start the vehicle [in park]. If the pedal remains where it should but then gets pulled down when you reattach the booster vacuum hose then there's a problem inside the booster somewhere. Don't try and drive it in this condition as it's not safe to do so. I've put in several used and new vacuum boosters over the years so although they are generally very dependable they certainly can fail.
Posted on Aug 03, 2010
The booster is working properly if the pedal goes down a little when starting the truck. Seems more like it's a master cylinder problem if it won't pump up.
REMOVAL & INSTALLATION Fig. 1: Disconnect the warning indicator at the master cylinder
Fig. 2: Remove the fluid to minimize the amount that would otherwise inevitably be spilled
Fig. 3: Unscrew the line fittings at the master cylinder
Fig. 4: Hold a rag under the fittings to keep fluid from dripping alWhen I start the truck, - 88289p03.jpgs
Fig. 5: Unbolt theWhen I start the truck, - 88289p04.jpgnder from the brake booster
Fig. 6: Remove thWhen I start the truck, - 88289p05.jpginder from the vehicle and set it in a clean location
Posted on Aug 03, 2010
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Posted on Jan 02, 2017
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