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Thread: What is this?

  1. #1
    Jr. Mechanic BluBurb89's Avatar
    Join Date
    Jul 2009
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    Port Orchard, WA
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    114

    Default What is this?

    I'd appreciate anyone identifying this for me and telling me what it does. I was going to Seafoam the manifold by introducing it via the vacuum hose of the brake booster but saw this between the hard line from the TBI base and the port on the booster. I figured that I probably shouldn't pour the Seafoam thru it; at least until I knew what it was, what it did and whether the additive would harm it. This is an '89 R1500 5.7L disc/drum.
    I looked at the vacuum routing sticker on the 'burb and at the routing schematic in the Chilton #28624 manual but didn't see anything or these old eyes missed it.
    It's the small split case cylinder between the booster and the air cleaner.
    Appreciate the help, Thanks.
    Click image for larger version. 

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    Last edited by BluBurb89; 08-09-2010 at 01:05 AM.

    1989 R1500 Silverado Suburban
    5.7L, TBI w/ Dual remote oil filters,
    16" 2010 CFM E-fan, K&N filter
    TH700R w/ Aluminum pan, remote trans fluid filter and aux trans fluid cooler
    Air shocks rear,
    7x16 dual axle cargo trailer; 10K Reese HD trunnion bar WDS, dual friction sway dampeners
    Cuz....I like to move it, move it....
    Semper Fi!

  2. #2

    Default

    DUDE...that's your Flux Capacitor...Ensure that it's Fluxing...Ha Ha Ha...I wish I could help..
    "You underestimate my willingness to resort to violence to resolve this conflict" :fighting0037:

    2006 Chevy Silverado 2500 HD LT
    (8" Fabtech Suspension Lift, 3" Performance Accessories Body Lift, 37x13.50 Toyo MT's, 20" KMC Rockstar, K&N FIPK, Edelbrock Headers, Edelbrock Extreme Travel Shocks with Reservoir, MagnaFlow Dual Exhaust, Black Bear Performance Tune)


  3. #3
    Sr. Apprentice
    Join Date
    Aug 2010
    Location
    Whitehall, MI
    Posts
    31

    Default

    looks like a pressure regulator/check valve of some sort. But I could be wrong.

  4. #4
    Legend
    TrailLeadr's Avatar
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    Jun 2005
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    Coventry, Rhode Island
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    Default

    It's a check valve. It's what allows you to still have a couple pumps of power brakes even after your engine is off and drawing no vac.
    Patrick
    Rhode Island


  5. #5
    Jr. Mechanic BluBurb89's Avatar
    Join Date
    Jul 2009
    Location
    Port Orchard, WA
    Posts
    114

    Default

    TrailLeadr, MonkeyBiz,
    Thanks for the info; it is appreciated.
    Ted

    1989 R1500 Silverado Suburban
    5.7L, TBI w/ Dual remote oil filters,
    16" 2010 CFM E-fan, K&N filter
    TH700R w/ Aluminum pan, remote trans fluid filter and aux trans fluid cooler
    Air shocks rear,
    7x16 dual axle cargo trailer; 10K Reese HD trunnion bar WDS, dual friction sway dampeners
    Cuz....I like to move it, move it....
    Semper Fi!

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