Save the check valve because it may be hard to find.
If you are satisfied with your brakes, you may not need Hydrovac.
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=844043

Techtips for Hydrovac
https://www.stovebolt.com/techtips/bendix/erickson/

Last edited by buoymaker; 03/15/2022 9:36 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."