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1st gen Brake Booster Failure - Rebuild No Good?

Discussion in 'Technical Chat' started by jarondenson, Oct 19, 2013.

  1. jarondenson

    jarondenson [OP] Member

    Joined:
    Sep 8, 2011
    Member:
    #63116
    Messages:
    18
    Gender:
    Male
    Thousand Oaks, CA
    Vehicle:
    01 Tacoma LTD 4x4 TRD S/C
    TRD SuperCharger 1st Gen w/ dynamic tensioner, TRD Headers, AEM Brute Force Intake, King Coil Over Front, add a leaf and Billstiens in the Rear
    Hello Everyone,

    I have a 2001 tacoma 3.4L ABS 4WD. I noticed that the truck was making a hissing noise in the cab and verified that the brake booster was leaking by doing the brake pedal check once the truck was turned off. I took it off and had it rebuilt. I just received it back and put a mighty vac on it to verify that it holds vacuum and it does not. It is sucking air where the master cylinder plugs into the vacuum booster. This to me does not sound right as I was pretty sure that they are supposed to be sealed units. However there is a paper gasket that goes between the master and the booster. But if you look carefully there is a relief cut on the underside of the master and also on the booster where it receives the master. So I am pretty sure that the seal is not supposed to seal the vacuum. Any thoughts on this subject would be great before I put this thing back in.
     
  2. NMBIII

    NMBIII Member

    Joined:
    Nov 11, 2013
    Member:
    #116403
    Messages:
    9
    Gender:
    Male
    Bay Area - California
    Vehicle:
    01 PreRunner SR5
    I think I have the same issue. How did you confirm that the booster was leaking?
     
  3. chasebrooks14

    chasebrooks14 Well-Known Member

    Joined:
    Feb 2, 2013
    Member:
    #96673
    Messages:
    524
    Gender:
    Male
    First Name:
    Chase
    Dahlonega, Georgia
    Vehicle:
    97 Tacoma LX 4WD
    Mickey Thompson Classic iii, Green LED interior floor lights, After market Kenwood touch screen radio, 20% window tint, Blacked out bumpers and grill, blacked out tail lights, Pioneer door speakers, bed lined toolbox, LED tailgate light bar w/ reverse lights, Bilstein 5100 all 4 corners and top setting up front, Trd Coils, New 1.5" lift leaf pack and shackles, White gages with blue needles. 32x11.5 Cooper STTs, 1.25" Spidertrax spacers
    my brake booster is just shit. its like I don't have power brakes. ive gotten a good bit of confirmation on here that the diaphragm in the booster was ruptured. so im just gonna buy another one
     
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