> > >My engine ran fine without any brakes when the >booster unit failed because the vacuum tank was fine. > Because also ther's a valve on the vacuum tank input hose. The vacuum could go from manifold to tank but the valve is closed in the other way. If not you'll not have some bellows movment after the engine is shut off and no "emergency" power brakes. If all is fine you could "pump" 3 or 4 times with the tank vacuum. -- Philippe COURANT (Pau, France)- Webmaster des sites ACCF et C-I-F Imperial 1957 Crown convertible Buick 1996 Roadmaster wagon - American Car Club de France (ACCF) : http://www.accf.com - Chrysler Imperial France (C-I-F) : http://www.ifrance.com/c-i-f - Cadillac " Standard of Excellence " : http://www.ifrance.com/accf-cad - SportsCars : http://www.ifrance.com/accf-sprtcar