Yes you do Phil, it's a very important part of the test. You need to have a way of testing its operation, sierra's have a push button in the top of the filler cap that will activate the switch when pressed. Also you need a way of checking that the bulb is working in the warning light, reason why the handbrake light is also the low brake fluid warning light or you can have a separate switch on the dash somewhere that will activate the light.
Andrew
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