Yep, sounds like you need a new MC. All the dual circuit VW MCs I have ever seen have a brake light switch on each circuit. If you lose the circuit with the switch and you only have one, then you would also lose your brake lights. Sounds like something the Chinese have come up with on replacements to save money; either that or they can't read blue prints; which I have long suspected. Had a long conversation yesterday with an old Houston VW mechanic about Chinese replacement parts. I will not put one on a VW; that is even if you could; cause they are usually made so poorly they won't even install. ________________________________ From: Gerald Livingston <gerald.tcb@xxxxxxxxxxxxx> To: tcb@xxxxxxxxxxxxx Sent: Mon, May 17, 2010 1:30:38 PM Subject: [tcb] Master Cylinder 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.