Lichtmann

Hi

Already posted this in the vintage forum but no reply.
I got a ´58 Olds with the original 371 engine.

I found out that the check valve located in line before the vacuum canister and the brake booster is leaking a little.
See picture.
The steel line goes to the carb and the rubber hose to the booster and canister.
When i suck at the steel end air passes trough as it should.
But when i blow in you can hear a little bit of air passing through the valve into the rubber hose.
I didn´t open it yet cause i don´t know what i´ve got to expet on the inside. Don´t want to have springs flying trough the room.
I can´t find a nos replacement.
Is it possible to just put in an additional check valve in the rubber line?
So i could use the original steel line and the valve for the look and let the new valve do the job right.
Does anybody of you have experience with that?
Any recommendations for valves?
What specifications besides flange diameter do i have to pay attention?

What about minimal cracking pressure?
I think it should handle a vacuum up to 25-30" hg. Is that right?

Anything else?

redoldsman

I used a check valve I bought off ebay. I think it was actually for a Mercedes but the hose diameter was correct and it was for power brakes. It is just a simple inline plastic check valve. I think it cost about 15 bucks.

Lichtmann

Thanks redoldsman

Was hoping for that answer.
Did you left the old one in place? That´s what i´d like to do to keep the original look.
Should i open the old one and remove the inside components? So they don't interfere.

redoldsman

The power brakes were added to my 54 from a parts car. It did not have a check valve like the one you have. The check valve I used looks more like an inline plastic fuel fiiter. If you can open yours up without destroying it, that is what I would do and then put the new one inline someplace it is not seen. That way you will look original. Just be sure you have the check valve installed in the right direction.

Lichtmann

Alright
Thanks for the advice. Appreciate that.
I let you know if and how it worked for me.
May take some time. First i have to put the engine back in place.