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Master Cylinder Questions

I finished my Rear breaks and now working on the front. I took out the Master Cylinder and was ready to replace it with a new one I got on ebay. Buut the orginal master cylinder has 3 stopl light switches all appear to be of different size. 2 have 2 places for connections and the other 3 but only uses 2. The replacement I got only has 2 places for stop light signals. My 2 stoplight signals are same part number but different color and size hole. One will not screw all the way in. My camera batteries are dead or I would have taken a pic. Here is what I wrote the seller and what he replied back. Is he right or did I get the wrong part? If he is right which wires get hooked up and is it ok that one doesn't screw in all the way?

The Master Cylinder I got from you only has 2 places for Stop Light Switches (One which doesn't screw in all the way). The one I pulled off my car has 3 ( 2 with 2 connectors, 1 with 3 connectors only 2 connected). I can I send the Master Cylinder and the 2 Stop Light Switches back for a replacement?

Thanks Steven

Someone had yours hooked up wrong. No VWs have 3 brake light switches. What year do you have? Switches should be facing left and angled down. Left and right front each have a port to thread in and the rear has a port.

Reply to
Noice87
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By the way my Car is a 68 Autostick.

Reply to
Noice87

The original mster cylinder had 3 switches. This mc is no longer available. The one with 2 switches replaces it, but you will need to modify the wiring at the switches. I think Speedy Jim's website may have the rewiring info.

Al Adams

Reply to
Al Adams

Yes, indeed it do:-)

Go to Electrical section.

Al is 100% correct; the old M/C is NLA and this one is the univ replacement.

Speedy Jim

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Reply to
Speedy Jim

Thanks for the info. But what about the Stop Light Switch that will not screw all the way in? Is that a problem?

Thanks Steven

Reply to
Noice87

VW used odd MCs in 68-9 which use 3 switches. The front and rear one should be the same, but the middle one is different, with a plunger sticking out of the threaded end. Starting in '70 they figured out a much better way to do the job and discontinued the 68-9 style of MC, even as replacements.

The later style, which you should switch to, uses 2 switches each with

3 terminals. The wiring should be changed to accomodate this change, and this can be made easy if you can find the MC wiring harness, about 3' long, that they started using in '70. It drops right in, and connects to the late switches.

The 3 terminal switch you have is a replacement. It's a tapered thread, you just screw it in until it's tight enough to not leak. Switches from different sources will have different amounts of thread left exposed, but that is not a problem.

When you're done here, you should have 2 switches, each with 3 terminals. The switches are cheap and are the switches that VW used from '70-on.

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----------------------------------------------- Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA

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Reply to
Jim Adney

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