Join Date: Nov 1999
Location: Central California, USA
Re: Brake Bleeding Mystery REVEALED
Just thought I'd throw the following info in for our archives.
The hold off valve would only be needed when driving a front disc brake equipped Camaro on ice or mud, and applying the brakes lightly like at a stop light, it can be worse with an auto transmission with the choke on fast idle. With the car above on a slippery surface, applying the brakes lightly will only cause the front discs to function, there isn't enough line pressure to overcome the rear drum return spring pressure. Once above 40 PSI the rear drums will begin to work. The Hold Off Valve prevents hydraulic pressure from passing to the front discs until the 40 psi threshold is reached. The purpose of the button which is the source of leaks is to allow pressure bleeding of the front discs, the button must be held in as most pressure bleeders can't be pressurized higher than 40 psi or they would be damaged. When manual bleeding, the button does not need to be held in. By the way, it takes a special tool to hold the button in, you can't do it by hand.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70