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DAC Operation Question.

Discussion in '2nd Gen. Tacomas (2005-2015)' started by OffroadToy, Nov 1, 2009.

  1. Nov 1, 2009 at 8:07 AM

    OffroadToy [OP] This ain't Dodge City, and you ain't Bill Hickok

    Sep 12, 2009
    4X4 Offroad
    snugtop, piaa, weathertech, westin, oem bed mat, trd seat covers, avs inchannel vent visors, 2" suspension lift, front diff drop, rear differential breather extension, oil filter drain hose, a/c drain hose extention & reroute, front window tint, cat theft protection plate, tailgate clamp mod, xpel headlight/foglight protecters, oem block heater, bfg 265/75R/16 a/t k/o's, cabin air rodent protection screen, rcbs illuminated 4X4 switch mod
    Yesterday while comeing down a steep hill (loose gravel, dirt, rocks) I was in 4LO with the automatic in low gear with no problems and decided to use the DAC (downhill assist control). Once I pressed the DAC button the traction control went into effect and started the pulsating brake thing...made a hell of a noise! When I switched the DAC off, the truck went down the hill smooth and at a slow rate of speed. My question...is it normal for the traction control to work the brakes while in DAC mode? I was under the impression the DAC used the engine for braking. It doesn't mention this in the manual, but would it be better to hit the DAC switch when stopped completely, rather than while crawling...maybe a little slippage occurred before the DAC went into effect causing the traction control to work the brakes to control slippage?
  2. Mar 16, 2010 at 3:14 PM

    Crom 1/2 way thru. I'll be back AUG 31, 2021

    Jun 22, 2009
    First Name:
    San Diego, CA
    2009 4x4 DCSB Camp Supreme
    My experience was the same as yours. It was very noisy and it uses the brakes. I did not like it at all. I don't understand the usefulness of the DAC feature while offroading.

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