What is this part? (pic inside)
11-25-2007, 09:24 AM
#1
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What is this part? (pic inside)
Just completed a complete frame swap and didn't know what this was when I was putting it all back together.
I'm almost sure it probably needs a vacuum line going to it.
I'm almost sure it probably needs a vacuum line going to it.
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11-26-2007, 04:48 PM
#8
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It is a vacuum sending unit. The repair manual states that there is a vacuum spec that must be maintained to operate the brake booster. If your vacuum signal gets to low, you will get an idiot light on for the brakes.
Ronnie
Ronnie
11-26-2007, 07:38 PM
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isnt this sensor alittle redundent, we have hydraboosters. i looked at my truck i dont have it. but it looks like the adjustable shock you find on like a mitsu. 3000GT or stuff like that. thats my .02$ or well .10 with inflation
11-26-2007, 08:42 PM
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You must have a 97 or later truck. 96 & early had vacuum assist brakes
11-27-2007, 07:55 AM
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That is the vacuum sensor for the vacuum-boosted brake system - triggers the Brake and ABS (if you have it) failure indicators in the instrument cluster.
Low vacuum in your vacuum-boosted truck is very dangerous, as you lose braking - later hydro-boost trucks just lose ac\heater and cruise functions - if that was never connected from when you got the truck, your alarm indicator bulb(s) are probably removed
As a life-saving suggestion, I'd re-connect it and get it working, as those vacuum pumps are known to fail suddenly
Or, get the hydro-boost from a late '97 or 12v '98 WITHOUT the 4w ABS - ALL the brake-line fittings are metric on the 4w ABS systems, won't even interchange with the orig pre-'97 stuff
Dumping that vacuum-booster was the first absolutely required modification to my '96 3500 - passenger cars get away with it because gassers (patooie!) have an eternal source of vacuum
Our eternal(?!?) source of vacuum is carbon\graphite vanes sliding in\out of slots at high speed around an aluminum chamber, no lubricant
I'll take my chances with the power steering pump - which, btw, you'll need the reservoir from the hydro-boost version for the additional return-hose fitting
Low vacuum in your vacuum-boosted truck is very dangerous, as you lose braking - later hydro-boost trucks just lose ac\heater and cruise functions - if that was never connected from when you got the truck, your alarm indicator bulb(s) are probably removed
As a life-saving suggestion, I'd re-connect it and get it working, as those vacuum pumps are known to fail suddenly
Or, get the hydro-boost from a late '97 or 12v '98 WITHOUT the 4w ABS - ALL the brake-line fittings are metric on the 4w ABS systems, won't even interchange with the orig pre-'97 stuff
Dumping that vacuum-booster was the first absolutely required modification to my '96 3500 - passenger cars get away with it because gassers (patooie!) have an eternal source of vacuum
Our eternal(?!?) source of vacuum is carbon\graphite vanes sliding in\out of slots at high speed around an aluminum chamber, no lubricant
I'll take my chances with the power steering pump - which, btw, you'll need the reservoir from the hydro-boost version for the additional return-hose fitting
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