1957 Power Brakes, check valve

[Steve Springer]

will power brakes work if check valve is not sealing properly

This page contains affiliate links for which I may be compensated. As an eBay Partner, and Amazon Associate I may be compensated if you make a purchase at no cost to you.

 

[cokefirst]

Yes
and no. the brakes will work if the valve is leaking, but you will not have any reserve since anytime the vacuum drops (rapid acceleration) the vacuum available to operate the power part of the brakes will not work as well. You will always have brakes, regardless of the condition of the valve. Is the check valve bad or is there a problem with the threads sealing on the power brake unit?