Vac pump failure - Ford Powerstroke Diesel Forum
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  #1  
Old 06-06-2011, 08:04 AM
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Vac pump failure

Pretty sure mine is dying a slow death- power brakes aren't working so hot and the AC blows out the defrost vents until RPM's come up. The pump is also making more noise and there is a buzzing under the dash that goes up/down with rpm.

Question- will a failing vac pump cause the e-brake light in the dash to come on? Since this problem started the e-brake light has been on also. At first it was intermittent, now it's on all the time.

Last edited by superduty4x4; 06-06-2011 at 08:08 AM.
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  #2  
Old 06-06-2011, 03:30 PM
Can you hear the derail??

 

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vac pump in mine went out and made a wheezing sound when running, but they are pretty cheap to replace i paid maybe $80 or so at oreilly auto parts for mine
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Old 06-07-2011, 06:38 AM
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not sure about the light, but when mine went out the shaft broke, fan ate the belt, bit of a mess and left me stranded. like 351 i got a replacement for about $90 at oreilly's.

i wasnt moving but 15 mph or so, if i had been pulling a trailer the pucker factor would have skyrocketed! id replece it. rent the pulley tool if you dont have one.
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Old 06-07-2011, 06:48 AM
Can you hear the derail??

 

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vac pump aint but 3 bolts i wanna say 7mm maybe, really easy i got one of those ratcheting box end wrenches made re install a hell of alot easier, my wife took my truck to work that day and mine ate the belt in the parking lot, so i put a new belt on it and it tore that to shreds in about 5 miles it took to get it home, they want a core charge too, and they swapped the pulley for me at the store
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Old 06-07-2011, 06:53 AM
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good point. tehy let me use their tool at the store, they were too busy to do it for me. iirc, when i had the problem, a few people stated that out vac pumps were poorly designed. snapping shafts, etc.
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Old 06-07-2011, 07:10 AM
Can you hear the derail??

 

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mine just stopped spinning, and would stick, spun a bit though if forced, but belt just ate up when it stuck and i got the good one that cost $90 with a 2 year warrenty, ate half way and snapped chewed it up good, guys at oreilly were like holy cow, that belt is guaranteed never to do that, so i got another one free
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Old 06-07-2011, 07:24 AM
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I swapped the pump from my wrecked truck last night, all is good in the neighborhood. The hardest part was getting the hose hooked back up! 3 10mm bolts, I used a box wrench and didn't have to fuss with the pulley at all.
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Old 06-07-2011, 07:33 AM
Can you hear the derail??

 

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i was close on the size, i used the cheap ratchet box wrench and it was glorious to get that thing, i wanna get a set of them here soon
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Old 06-07-2011, 03:06 PM
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Yes, the low vacuum will throw on the "brake" light. On the driver's fenderwell, there is the vacuum manifold and a small canister hooked to it. The small canister is the low vacuum warning switch.
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Old 06-07-2011, 11:56 PM
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get new if you can, ive had two napa rebuilt ones and the first lasted 3 months and im on the 2nd now.
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