The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**jocko** · 11-13-2020, 04:21 PM

Not completely sure what you mean by the bleeding tool. There is a special tool for recentering the valve, but it's unrelated to bleeding the system - if you mean he beld the mc or pressure bled the system, that won't recenter the valve - good idea that you asked POL, they will know how to do it for their part. The other
less technical" method to center the valve (assuming you confirm you have good flow from the master), is to STOMP on the brake pedal real hard. It sounds silly, but it is a method of recentering the shuttle valve. Considering it's an aftermarket prop valve - it could absolutely be faulty - or it's also possible it's adjusted all the way to bias to the front (unlikely though).

11-13-2020, 04:21 PM	#6
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 18,001	Re: 1972 C20 master cylinder Not completely sure what you mean by the bleeding tool. There is a special tool for recentering the valve, but it's unrelated to bleeding the system - if you mean he beld the mc or pressure bled the system, that won't recenter the valve - good idea that you asked POL, they will know how to do it for their part. The other less technical" method to center the valve (assuming you confirm you have good flow from the master), is to STOMP on the brake pedal real hard. It sounds silly, but it is a method of recentering the shuttle valve. Considering it's an aftermarket prop valve - it could absolutely be faulty - or it's also possible it's adjusted all the way to bias to the front (unlikely though).