To answer the original question, you can test the switches with an
ohmmeter, wires unplugged, brakes applied and not.  Each three-terminal
switch has a common terminal, a normally closed terminal that opens when
you apply the brakes, and a normally open terminal that closes when you
apply the brakes.

Yrs,
d

On Sun, Apr 30, 2017 at 3:39 PM, B Feddish <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
>