You have to be careful with these things.
Our '69 Buick SportWagon came with one.
One day while driving to work the brakes started to go. Soon they were almost completely gone (very hazardous !). I assumed that it was the master cylinder due to the symptoms.
So we put a new one on. Tried and tried to bleed the system, but could not seem to get the air out of the lines. I drove it again anyway and the brakes immediately started to fade.
After much "debate" we finally discovered that this metering valve was letting air into the system (even though it was not visibly leaking any fluid). So, we just bought a junction block and removed the valve from the circuit. the brakes then bled fine and everything has been ok since.
I just got the valve back from the rebuilder and I will get it installed soon.
Does anyone know the real purpose for this valve ? There is already a separate proportioning valve in the system. Maybe this valve is supposed to delay the hydraulic signal to the front ?
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Dan Carr
[email protected]
Team Chevelle Gold Member #11, ACES #701
Author of the GMC Sprint, El Camino, and '68-'72 SS Authentication pages.
See my GM A-body fleet at:
www.rmi.net/~dcarr/cars/cars.HTM