Gary & Michael,
Thanks for the replies guys. Unless I hear another possibility to check out I plan to replace the vac. booster this weekend.
Gary, you sure aren't discrediting me; maybe the FSM? LOL.
Cal
> Date: Mon, 12 Dec 2011 11:04:28 -0500
> From: <clhyer@cox.net>
> Subject: DML: Brake questions
>
> Good morning folks,
> Working on my son's '98 V-6 2WD Dak and am kinda stumped. Briefly, about a year ago the brake and ABS lights came on. At the same time the pedal took more effort, took more pedal before starting to work and when stopped you can feel the pedal pulsing like a spring snapping back on the pedal.
> We replaced the speed sensor at the rear end without success. I replaced the master cylinder without any change.
> I've taken it to a shop to have the code read and it said it couldn't read the ABS controller (located on the LF fender). I picked up a used controller at a junk yard and so far (about 2 weeks) the lights have stayed off. The pedal remains unchanged.
> I have performed the various tests outlined in the FSM and cannot locate the problem.
>
> The last test I performed was with a vacuum gauge to check the booster. According to the directions and diagram the vac. gauge is hooked into the vac. line with a "T" fitting. The vac. line into the T is clamped off, the engine shut off and you see how long vac. is held. A loss of 1" in 15 seconds is supposed to indicate a bad booster. When I perform this test, as soon as I clamp the vac. line the vac. goes to zero. It don't move when the truck is shut off either! Duh!!!
> Anyhow, I performed this same test on my '99 Dak which has no brake issues. The vac. gauge does the exact same thing.
>
> The truck stops fine, it just takes more pedal and more effort. Any ideas for me?
> Thanks,
> Cal
>
> ------------------------------
>> ------------------------------
>
> Date: Mon, 12 Dec 2011 15:20:16 -0500
> From: Michael Maskalans <dml@tepidcola.com>
> Subject: Re: DML: Brake questions
>
> On 12-Dec, 2011, at 11:04 , <clhyer@cox.net> wrote:
>
> >
> > The truck stops fine, it just takes more pedal and more effort. Any ideas for me?
>
> That sure sounds like a booster issue to me, but your similar test results do make me question it. Until that point I was thinking "booster, booster, booster" though so I'm going to stick with my gut and say you've got a bad booster.
>
> Michael
>
> ------------------------------
>
> Date: Mon, 12 Dec 2011 16:06:57 -0600
> From: Gary Hedlin <superdak@gmail.com>
> Subject: Re: DML: Brake questions
>
> It's screaming booster to me too... I know the test results say otherwise,
> but I've been down that road with the 98, so I have to say its the booster
> issue. Not to discredit you or your tests, but I just cant see anything
> else.
>
> Gary
>
>
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