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#1 1969 vacuum check valve question
Posted: Mon Oct 03, 2022 11:23 am
by autoalain
Folks, below the vacuum tank (breaks) there is a check valve c27306, what does this 46.00 dollar part do?
I have a check valve from another make of car I would like to use, but because I do not have the old one
I have no idea what the process is, I guess it holds vacuum for brakes, but do not know why it needs
a check valve, thanks Mike.
#2 Re: 1969 vacuum check valve question
Posted: Mon Oct 03, 2022 12:18 pm
by MarekH
It holds vacuum for the brakes. Whenever the air pressure in the manifold is lower than in the vacuum tank, the one way valve evacuates any remaining air from the tank/reservoir used to give you vacuum assist for the brakes again next time you stab the brakes. Without it, the amount of vacuum assist would depend on engine load.
A valve from any other car with power assisted brakes will do.
kind regards
Marek
#3 Re: 1969 vacuum check valve question
Posted: Fri Oct 14, 2022 8:47 am
by ianc9
I think most other cars have valves with just 2 connectors (in and out) on them. If this is the case with the one you sourced then you'll need to stick a Tee connector in the accommodate the pipes to the reservoir and the servo on the "out" side.
#4 Re: 1969 vacuum check valve question
Posted: Mon Oct 17, 2022 7:52 pm
by caveman
Make sure you put the two pipes on the right way around. It’s the difference between a heavy brake pedal (no assist) and good pedal with servo assist. Mine was plumbed wrong for many years before I investigated further and wow what a difference.