How critical is the black & blue check valve that is between the brake booster, and the 4-way to the vacuumm reservoir, cruise control, and HVAC system? It's missing on my car, and a strait connector is in it's place.

Thanks, Joe

 

It is needed Joe, with out it the vacuum storage canister can not store high vacuum.

They are about 5 bucks apiece, buy two and the fourway T's, they seem to shrink and get hard.

 

+1. I can get them through Banger if you need help sourcing them, let me know.

 

i just got a autozone generic and a few adapter fittings, working great. w/out it your H20 vlave may open on deceleration or vacuum fluxuations, get a Hot blast through your AC

 

+1! Thats exactly whats happened. I'll be sitting at a light and my A/C will shoot hot air, then start cooling again.
Thanks guys, Joe

 

That exact 4 way tee, that no one can ever find, is a Mercedes part...let me know if you don't have the part number.