Brake Booster Grabbing - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 10-15-2007
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Brake Booster Grabbing

My old '84 2.3 Ranger 2WD had a vaccuum leak at the brake booster (and it froze solid in the winter due to moisture). So I found a used one which looked good. Installed, no leaks, stops truck. Great.

BUT...

Most times when just lightly touching the pedal, the booster will grab the pedal and apply the brakes with moderate force, and then slowly release.

At other times the brakes will apply normally, but the pedal will not return on its own - needs a toe to pull it up and free the brakes.

What would cause the booster to draw down the pedal, or to hold it down? I'm pretty sure I installed it properly. Do I need a new booster, or could there be another cause? My mechanic is stumped too.

Gordon
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  #2  
Old 10-20-2007
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So...

no one ever heard of this problem?

its a stupid question?

24 yr. old Rangers don't rate?
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  #3  
Old 10-20-2007
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Sounds like a sticky master cylinder.
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  #4  
Old 10-20-2007
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Thanks Blhde,

The master cylinder was fine before changing the booster. Now the brake pedal will actually apply itself if just touched lightly - it moves toward the floor and slows the truck without my foot on it.

It seems like the vacuum actually has power over the pedal because this effect doesn't happen if I disconnect the booster vacuum tube.
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  #5  
Old 10-20-2007
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Quote:
Originally Posted by gordonb1
Thanks Blhde,

The master cylinder was fine before changing the booster. Now the brake pedal will actually apply itself if just touched lightly - it moves toward the floor and slows the truck without my foot on it.

It seems like the vacuum actually has power over the pedal because this effect doesn't happen if I disconnect the booster vacuum tube.
buy a new booster then, i think they are all the same from 83-08.
im not 100% positive, but they all look the same.
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  #6  
Old 10-20-2007
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replace the master cylinder first,that should solve the problem from what your decribing.
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  #7  
Old 10-21-2007
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Thanks to both for the advice. Why do you target the master cylinder Kevin?
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