Join Date: Nov 1999
Location: Central California, USA
Re: Could Proportioning valve be the culprit?
That part is not a proportioning valve. It holds back pressure going to the front brakes until aprox 40 psi is reached, allowing the rear drums to overcome return spring tension so the rears start working when the front discs do. The button allows fluid to pass at lower psi when pressure bleeding. It goes in the front brake line, thus it could never do anything to reduce rear line pressure.
Any proportioning valve from the factory would be in the rear brake line, and it would be mounted on the outside of the frame rail aprox under the drivers seat area.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70
Last edited by davidpozzi; Jul 12th, 10 at 11:30 AM.