Vac pump failure

[superduty4x4]

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.

[351fifty]

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

[ridiculously_necessary]

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.

[351fifty]

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

[ridiculously_necessary]

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.

[351fifty]

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

[superduty4x4]

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.

[351fifty]

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

[alberta 7.3]

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.

[tenpack]

get new if you can, ive had two napa rebuilt ones and the first lasted 3 months and im on the 2nd now.