Recently replaced calipers and the brake booster check valve quit working when blown in air flows in both directions unsure if brake booster it's self is OK or not but all the parts have been disconnected Ive not checked pull and pays yet but was wondering if i could pipe the two vacuum lines together and put on a generic check valve? I'm a BAS engineer I work with PLC and Pneumatic very often just need to know how much vacuum each of the two lines creates or if anyone has found a full replacement of brake booster and check valve any info would be greatly appreciated.