I have an 84... the pressure switches on the MC were the cause of my problems.
Don't get the cheap ones.  I've changed these about 3 times in the past 5 years, and finally went with only the ATE brand.
2 prong through 1986.  (Power assist) with provision for 2 switches. ** Models thru 1986 use 113 945 515H, 2 Pole Brake Light Switch** ** Models 87-89 use 113 945 515G, 3 Pole Brake Light Switch**

Best price I've found for the ATE brand. https://www.fcpeuro.com/products/porsche-brake-light-switch-ate-113945515h

FCP also provides a FREE Lifetime Guarantee on ALL Parts, even wear out items!

Switches can be replaced without removal of the MC.

Jack

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of B Feddish
Sent: Sunday, April 30, 2017 4:22 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Brake warning light on

Just checked, yes they are.

Thanks,
Bryan

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Jim Felder<mailto:jim.felder@gmail.com>
Sent: Sunday, April 30, 2017 4:06 PM
To: B Feddish<mailto:uprightbassghost@hotmail.com>; vanagon@gerry.vanagon.com<mailto:vanagon@gerry.vanagon.com>
Subject: Re: Brake warning light on

Wires plugged in?

Jim

On Sun, Apr 30, 2017 at 3:05 PM B Feddish <uprightbassghost@hotmail.com<mailto:uprightbassghost@hotmail.com>> wrote:
Nope, fluid is fine 😊

Bryan

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Jim Felder<mailto:jim.felder@gmail.com>
Sent: Sunday, April 30, 2017 3:58 PM
To: B Feddish<mailto:UprightBassGhost@hotmail.com>; vanagon@gerry.vanagon.com<mailto:vanagon@gerry.vanagon.com>
Subject: Re: Brake warning light on

You are low on fluid.

Jim

On Sun, Apr 30, 2017 at 2:39 PM B Feddish <UprightBassGhost@hotmail.com<mailto:UprightBassGhost@hotmail.com>> wrote:
My brake warning light is on.  Everything seems OK so I want to see if the switches  on the master cylinder are bad, is there a way to test them or should I just replace them?

Thanks,
Bryan

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