The diaphragm probably has a hole in it. Rebuild it or have it done by Then & Now Automotive. https://www.thenandnowautomotive.com/auto-parts-store

Last edited by Gdads51; 02/18/2026 3:04 AM. Reason: update to new web address

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)