M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Rear brake light issue

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Old Jun 29, 2024 | 11:03 AM
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2009 ML550
Rear brake light issue

Hello fellow MLers. I get this brake light right warning and when seen at the back, indeed the right brake part doesn’t light up, but what is the part that does light up instead?…
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Old Jun 29, 2024 | 12:02 PM
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2009 ML550
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Thanks to some research here and online I realized that the extra illumination on the right is a “buck-up” light (genius - I was not aware of that). It was turning on because the brake light was burnt. I replaced the P21 bulb of the brake light and now everything works just fine. Thank you all for your time.
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Old Jun 29, 2024 | 12:11 PM
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Originally Posted by medic;[url=tel:8993709
8993709[/url]]Thanks to some research here and online I realized that the extra illumination on the right is a “buck-up” light (genius - I was not aware of that). It was turning on because the brake light was burnt. I replaced the P21 bulb of the brake light and now everything works just fine. Thank you all for your time.
Thanjs for the heads up. Good info. 👍
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Old Jun 29, 2024 | 01:18 PM
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1998 SL500,2011 GL550,2009 ML350,past 1995 E320 Cabrio ,2005 ML500,2006 ML500,1996 SL500,1972 280SEL
clean up

while replacing the bulb it would be wise to get a fine file and clean the bulb holder edges. They are notorious for corrosion and ground issues.
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