Does someone know if overhaul kit (seals, "o" rings etc..) are available for the bellow unit (57-59) ? It seems that mine needs an overhaul: sometimes when i push the brake pedal i've nearly an engine stall (vacuum leak ?). After , when the unit is "poised", no problem. But since three days this failure has disapeared and the system works well ... -- Philippe COURANT (Pau, France) Imperial 57 Crown convertible Buick 58 Roadmaster sedan - American Car Club de France (ACCF) : http://www.accf.com - Chrysler Imperial France : http://www.ifrance.com/c-i-f - Cadillac " Standard of Excellence " : http://www.ifrance.com/accf-cad - SportsCars : http://www.ifrance.com/accf-sprtcar