I'm am planning to bleed my 4 disc conversion.
According to the 1970 Chevrolet Service Manual under Brakes 5-29 it states"The spring loaded end of the pressure metering valve (fig47) MUST be depressed while bleeding. This can be done by depressing and holding in the plunger in the end of the valve either by hand, or by clamping."
My question is, has anyone done this when bleeding their system? I've never read of this being done. When I press on my new valve (rubber end) I feel no movement. Comments?

The button moves OUT when you step on the brake pedal. With no pressure on the system the button is in.

That said.....

I wouldn't use the metering valve in a 4 wheel disc system. All it does is to delay the fronts applying until 40-50 psi is achieved in the sysytem.

If you're set on using it, and bleeding the brakes with the old "pump the pedal" method, you shouldn't have to worry about the button since you'll achieve enough pressure to force fluid past the valve. If you are pressure bleeding the system, wrap a large hose clamp around the valve and button and tighten it down. Pressure bleeders don't generally use enough pressure (20 psi or so) to get fluid past the valve.

Thanks for the info. I'd never realize the button moves "out". As far as using the metering valve, I think I should IF it was designed that way. I don't think I could "reengineer" better than the General by leaving it out.

Thanks for the info. I'd never realize the button moves "out". As far as using the metering valve, I think I should IF it was designed that way. I don't think I could "reengineer" better than the General by leaving it out.

The metering valve was only used with the production DISC/DRUM system; it was NOT used with JL8. It was only there on the disc/drum system to hold off pressure to the front calipers until the drum portion of the system saw 30-40 psi to move the rear drum shoes out against the drum surface for balanced brake application.

:beers: