vacuum pump failure
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New User
Joined: Feb 2010
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vacuum pump failure
I have 2001 7.3 liter turbo diesel E-350. I have replaced the vacuum pump 4 times over the last four years. What causes the pump to fail?
pump starts to make a lot of noise. Lose pressure on brake pedal. The first press on the pedal has some pressure. The second has almost none. I have had it replaced at two different dealers hips and two different independent shops.
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pump starts to make a lot of noise. Lose pressure on brake pedal. The first press on the pedal has some pressure. The second has almost none. I have had it replaced at two different dealers hips and two different independent shops.
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Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
Diaphragm in them usually cracks, but I haven't seen them fail in that short of a time period. Seems odd. How's the vacuum brake booster diaphragm? Does it hold vacuum after you turn of the engine? Did you still have a good pedal for a few stops when the pump was good?
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
Only thing that comes to miind is a leaking brake master cylinder. If fluid gets in the booster from the rear of the M/C, it could get drawn into the vacuum pump and ruin the diapragm. Just a thought. You could unbolt the master cylinder from the vacuum booster and check this. Has the brake M/C been replaced before?
