ckell,

You shoudn't hear vacuum through the fresh air breather in the cab, the piston seal is leaking.

Take a picture of the unit to NAPA and see if they can help, if not send your unit out for rebuild.

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD