Mine sticks sometimes and does this but tapping it up with my foot generally solves it, the parking brake on our '83 is so loose it doesn't really hold the car and also the pedal is floppy so the brake light is always on......we'll look into it eventually....

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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)