Do you have to fit one of these for sva
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Not if you have the correct warning lamp with the graphics on it and a press button in the top of your master cylinder reservoir that illumintes the above-mentioned lamp when pressed.

Pat...

No - but you do have to have a manual means of testing which is usually the depressor on top of the sierra mastercylinder, the yellow cap. Also the handbrake circuit test's the bulb as they are interlinked.

You do have to have a brake line/handbrake warning light - not necessarily a switch.

HTH

You have to have some means of testing the warning light operation from the driving position, most use the handbrake warning light but if you don't have that then you use a switch. It is supposed to have the (!) symbol on the illuminated red bit.

Yep. Has to be testable from the driving position.