I have a 66 bug with a dead brake master cylinder.... I was wondering if it would make sense to try an fit a new style one with the dual circuits? Does anyone know what year master cylinder and if there are any other parts needed to do this conversion...?
Thanks again for all your help!!
Dan
Yes, it's a good upgrade. Use the common dual ckt M/C 113 611 015BD You will need the dual reservoir too. The one from a '67 will fit right where the existing one is. If you get a '68 or later res you'll have to mount it remotely. Get some new hoses for the res to M/C. The new M/C has 2 stop light switches. See my web site for the wiring of 3-prong switches, or just use 2 2-prong switches.
Speedy Jim
6mm hoses ok?
From the catalog, looks like 7mm. Jim
thanks.
If your bug was supposed to use a MC of 17.46mm bore (which means the brake cylinders in the drums are 22.22mm in the front and 17.46mm in the back), then upgrading to a newer MC (which has 19.05mm bore) would require more pedal force for equal amount of braking. To be precise, you need to apply 18% more pedal force on a 19mm MC than on a
17mm MC for the same amount of braking. You should therefore switch the front and rear brake cylinders to the correct sizes for a 19mm MC (22.22mm or 23.81mm in the front and 19.05mm in the back). If you have installed larger tires and wheels don't lock-up easily under heavy braking, the 17mm MC combined with the larger brake cylinders that are to be used with a 19mm MC, will provide stronger braking. In my opinion, you should either use a 17mm single circuit MC for less braking effort, or the 19mm dual circuit MC for more safety. Using a 19mm single circuit MC is pointless. Finding a 17mm MC is not easy these days, I've only been able to locate them at RMMW.Bill, '67 bug.
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