In article <FnqMj.3235$nT1.1052@[EMAIL PROTECTED]
>,
"Doug" <DZappyNOSPAM@[EMAIL PROTECTED]
> wrote:
> Hey folks,
>
> Gotta dilemma that has stumped a regular ASE shop, the dealer****p, and
> another entirely different ASE shop for over 2 months now. I have a
1994
> GMC 2500 2 wheel drive standard truck, no AC with a 305 in it. My brake
> light keeps coming on, and the pedal gets spongy.
> No lines are leaking, I have replaced wheel cylinders twice, it's had 3
> different Master Cylinders put on it, and the rear anti-lock has been
> replaced. Not that this matters, but I've had 3 break jobs done on it
in
> the same 2 month period, pads and shoes.
> They, (the mechanic's) have tried power bleeding, and manual bleeding,
> thinking that some valve gets in the way if you try to power bleed it,
so
> then they manually do it, to no avail. But they DO get air, they think.
> After they bleed it, it's good for a day or 2, then reverts back to:
Brake
> light and spongy pedal.
>
> I am at wits end with this thing, and all I know to do it start
switching
> parts, what's left. Distribution block, power assist, and calipers. I
think
> that's all that's left.
> Any insight to what I might try next or what it might be??? This is
what I
> told each mechanic and they all say the same thing, "It's very very rare
> that a distribution block goes bad", and "The power assist wouldn't
cause
> air to get in the line", and "The calipers would show something wrong if
> they were bad".
> What the He** is wrong with this thing???
>
> Any and all suggestions are appreciated!!
Put a brake pedal depressor on it for a few hours, if there is a leak,
it should show up.
Be sure to pull the brake lamp fuse.
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