Also, if you just use your foot to keep the pedal pushed up and back against the plunger for about 30 seconds, the light will stay off, at least this works on my 88 300ce. Good luck.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)