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Thread: Service Brake System Light????

  1. #1
    Join Date
    Sep 2008
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    Hope Mills, NC
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    Service Brake System Light????

    alright fellas my truck was up on stands for about 2 months doing my t56 swap. Since finishing the install my service brake system light is on, abs light on, and emergency brake light on. I checked all the emergency brake stuff out and even took the dums off outback to check everything out. came up with nothing. What could be the problem with my truck. brakes seem to work fine. It bogging my truck down and making it run like crap. help me out here...
    2005 GMC RST *sold
    2006 Silverado SS with nawz

  2. #2
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    Sep 2008
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    Hope Mills, NC
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    alright update so far iv tried this... tried unplugging the master cylinder brake fluid level sensor and also tried unplugging the brake light switch... problem still occurs. i also tried holding the reset button when the light comes on, hoping maybe it will reset. no luck. and i also unhooked the battery for more than 30 min. no luck as well.... someone help!
    2005 GMC RST *sold
    2006 Silverado SS with nawz

  3. #3
    Join Date
    Oct 2009
    Location
    huntington indiana
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    472
    i changed the brakes on my girlfriends saturn and it did that, i never figured it out. around the same time this happened her trans. started messing up, it had a bad shutter and shifted up and down violently when it didnt need to be shifting, vss sensor?
    procharger p1sc, nelson tune, 42# marine injectors, walbro 255, lt's, ory, 4" volant cat back, PerformaBuilt level 2 pro race trans, trans. cooler with e fan, 2500 stall, aem wideband, energy bushings, spohn perf. trailing and panhard rods, mb & gear alloy 22's ( ya 2 sets, im big ballin), ss brake lines, drilled & slotted rotors, bla bla bla bla bla bla bla,
    and ya it will beat a hemi.

  4. #4
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    Sep 2008
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    i also cleaned the grounds on the drivers side for the e brake and all that good stuff at the front of the cab. i have no idea what is going on with this thing. 6 gear also shutters but im guessing thats from such high gearing in the rear 3:73 keeping it at around 1000 r's driving around. 5th is the sweet spot at 1700. vss? would that be in the trans or something electrical on the actual truck? no1 has had this problem but me?
    2005 GMC RST *sold
    2006 Silverado SS with nawz

  5. #5
    Join Date
    Mar 2009
    Location
    Tyler, TX
    Posts
    871
    Vehicle Speed Sensor, check the part number compatability on the sensor, if you have the wrong sensor installed it may be sending the wrong signal to your pcm which will really screw with the abs system. thats where i would start, you might just need a new/different sensor
    [IMG]https://images.app.goo.gl/XLfskemekXBo5VfS7/IMG]
    www.tjc.edu

  6. #6
    Join Date
    Feb 2010
    Location
    Odessa, texas
    Posts
    916
    Quote Originally Posted by molitor View Post
    Vehicle Speed Sensor, check the part number compatability on the sensor, if you have the wrong sensor installed it may be sending the wrong signal to your pcm which will really screw with the abs system. thats where i would start, you might just need a new/different sensor
    x2
    1983 Ford Ranger- 2.3 to 205k mile 6.0 swap

  7. #7
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    Sep 2008
    Location
    Hope Mills, NC
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    was there a recall on this? i keep reading online that this could be a recall on my truck??? anyone have this happen to them?
    2005 GMC RST *sold
    2006 Silverado SS with nawz

  8. #8
    Join Date
    Sep 2008
    Location
    Hope Mills, NC
    Posts
    676
    tried a new vss .... still have the codes. now i also have a engine misfire code ontop. i really cant win. i cleaned and inspected the abs sensors in the front both looked fine to me. i also dont hear the abs pump humming when i turn the truck off and brakes seem fine to me. someone HELP!!!!!
    2005 GMC RST *sold
    2006 Silverado SS with nawz

  9. #9
    Join Date
    Oct 2009
    Location
    huntington indiana
    Posts
    472
    what truck/year is it and what did you have b4 the t56?
    procharger p1sc, nelson tune, 42# marine injectors, walbro 255, lt's, ory, 4" volant cat back, PerformaBuilt level 2 pro race trans, trans. cooler with e fan, 2500 stall, aem wideband, energy bushings, spohn perf. trailing and panhard rods, mb & gear alloy 22's ( ya 2 sets, im big ballin), ss brake lines, drilled & slotted rotors, bla bla bla bla bla bla bla,
    and ya it will beat a hemi.

  10. #10
    Join Date
    Sep 2008
    Location
    Hope Mills, NC
    Posts
    676
    2005 gmc sierra and it had a 4.8 5 speed which is now converted to a 4.8 6 speed via the t56
    2005 GMC RST *sold
    2006 Silverado SS with nawz

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