On a 72, there is a "button" on the end of the prop valve. Originally
it has a rubber cover, but that may be gone. When bleeding, the button is
suppose to be held in. I've heard of numerous people who claim that they
bled the brakes without pushing in the button & had no problem.
Booster does not come into play when bleeding. You can check the
diaphragm of a booster with a vacuum pump. Just pump it up & see if it
holds vacuum. It should not leak. You should also check the valve which
is between the intake manifold & booster. It should only open in one
direction.
I'm not sure how to positively check the master cylinder. It should "pump
up" when you pump the brake pedal but don't know how complete a check that
is.
On 12/1/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> Hi guys was wondering about the correct way to bleed the disc/drum power
> brake system on a 70 chevelle? I think i read some where that you need to
> hold open the prop valve while bleeding (?) does the booster require vacumn
> during bleeding? is there a way to tell if the booster is bad? if the master
> is bad? Thanks steve
>
>
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--
Rick Schaefer
72 TPI El Camino
