[kyle_blake]

HI,

I have ordered up all new front brake lines from inline and the new pv2 proper combination valve so i can remove the old distribution block off frame and old hold off valve.

the company up here that sold me this stuff decided to give me another brand of brackets that holds the pv2 valve and not the correct brk03a that inline tubes says is the right part. So now i'm on hold for another re-order up to canada which is 6 weeks away. project take a MILLION YEARS I TELL YAH!!

I decided lets come back to the issue and see if i can find something I over looked.

i've been getting air in BOTH front lines - bubbles - with 2 man bleeding for like 2-3 yrs now. only way it would ever sorta half bleed is gravity then i could drive it for 3 - 4 times then pedal to floor. hence the - it's the hold off valve or the distribution block or the line in between. backs have always had no bubbles

so i decided to take off the hold off valve as it's in the front line system of the brakes before the line goes down to distribution block. no one i know has mentioned it to me before and i'm mad at myself for not just taking it apart or at the VERY LEAST BYPASSING IT with a union connect fitting and re-testing.

here are some pics. on the backside where the button is , its completely rusted. when i press the button i can see brake fluid around the edges. i think i clearly found the culprit?

https://youtube.com/shorts/BW-UuSxTxgE

anyway, forum has helped me a lot and yes i haven't solved it yet but just wanted to see if anyone has seen these fail, when they do, do you see fluid at the button behind the rubber?

also wanted to share who has rebuild kits for them:https://www.musclecarresearch.com/gm-3905525-rebuild

I also found another py person wrote this about these valves:

DO NOT hold the button unless you are PRESSURE bleeding.
Using a C-clamp can damage the valve. The proper tool holds little pressure to the button.

The valve allows flow below ~2psi (gravity bleeding) and above ~75psi (manual bleeding). It cuts flow between ~2-75psi. Pressure bleeders work at about 30psi.

Foam can be caused by many things. Possibly the valve is letting air in.
Possibly a bleeder, esp if you are using a vacuum bleeder or speed bleeder.

Possibly the valve is sucking air. They do that sometimes esp if it is the bullet valve type. Bypass it to test.