I'm talking about the lg. round valve with a lg. hex nut on it. Not the proportioning valve.

I'm in the process of converting to front disc on my 69. I've got a hold off valve, but I'm not sure if it needs to be disassembled.

Is the piece that the rubber cover goes over (oppososite end to the heax nut) suppose to move for bleeding or something?

Mine can not be pushed in. Is it rusted?

Thanks

[ 11-24-2003, 03:26 PM: Message edited by: 69rad ]

Pry the rubber cover off, it is just over an internal lip. There should be a pin that sticks out, if it doesn't stick out after brakes are applied, it is stuck and should be dissassembled and cleaned.

Holding in the pin allows a pressure bleeder to bleed the front brakes. The ball type pressure bleeders have a max pressure of around 40 psi, the valve will not pass fluid until a higher pressure than that.
You can't just push the pin in, release it and then bleed, it has to be held in while bleeding.

If you do a manual bleed by pumping the pedal, the pin does not need to be pressed in. There is a special tool to hold the pin in. I'd imagine it is a Kent Moore tool.
David

Thanks David for the info!!!!

I have not installed the valve yet, but was concerned because I'm unable to depress the valve, it appears to be in the "in position".

So the fact that I can't depress the valve is normal? After installing the valve, if the pin is in the "in position" it will pop out?

If I need the rebuild kit for this valve has anyone know of the source? I could not find it doing a search, only a refereence that there is a source for the parts.

The pin will press in, but will only come out when the pedal is depressed. Once out, will stay out unless pressed in again.
I believe there is a very very small O ring around the pin, and larger one on the nut. I don't think there are any other seals in there...

Any hydraulic store should have O rings that will work. Ask if they are OK for use around brake fluid or test them by immersing them in brake fluid for a week before you use them. If they swell up, get some made from a different material.
David