[Chevelle-list] brake bleeding

[dansolomon at msn.com]

The same valve you describe is also on the 69 thru 71. 
You will know if the master cylinder is bad. You won't have any pedal or it will leak down when you stand on it.
I had a new one go bad and the pedal went to the floor.

Godspeed,
Dan Solomon
It is a mistake to allow any mechanical object to realize you are in a hurry.
http://www.freewebs.com/chevelles1970/

-----Original Message-----
From: "Rick Schaefer" <rickas at gmail.com>

Date: Sat, 1 Dec 2007 12:36:16 
To:"The Chevelle Mailing List" <chevelle-list at chevelles.net>
Subject: Re: [Chevelle-list] brake bleeding


   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, SS454HILLMAN at aol.com <mailto:SS454HILLMAN at aol.com>  <SS454HILLMAN at aol.com <mailto:SS454HILLMAN at aol.com> > 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