2001 hyundai rear brake backing plate view

On the rear of the backing plate 2001 Hyundai Elantra There is a plastic insert that looks like a press on off switch. Anyone know what this is?

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On Tuesday, November 12, 2013 12:17:54 PM UTC-5, Rob wrote:

The parking brake shoe lever is on the opposite side of this plunger. No idea what the practical use is.
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