Just run with one switch Brake MCs on busses are one of those catch as you can items. Have you considered rebuilding yours? -- Sent from my Palm Pre On May 17, 2010 2:40 PM, Gerald Livingston <gerald.tcb@xxxxxxxxxxxxx> wrote: Why do all of the new master cylinders I can find state "for one brake light switch" but the actually installed on my '70 has 2? Even the German listed at Bus Depot (for $180) says "Brake Master Cylinder, 1970 22.2mm, w/o Servo, (For ONLY 1 Brake Light Switch)" Mine has 2 switches and the "oops light" on the dash. Any reasonably priced CORRECT replacements out there? G2 P.S. The valve inside mine is going out. Sitting with foot on brake the pedal will suddenly drop to the floor. Lift foot, press again, all is good. No leaks. Reservoir still full.