marcopolo Posted April 10, 2007 Share Posted April 10, 2007 If I recall correctly, the tail/brake light bulb on my 1150R had a dual filament, i.e., one filament for the tail light, and a second which came on when the brakes were applied. On my R12RT, each of the two tail/brake light bulbs has have a single filament. How do they work; what makes the bulb brighter when the brakes are applied if there's only one filament? Is the bulb operating at reduced intensity when it's just performing the tail light function, then increasing to 100% intensity when the brakes are applied (like some Daytime Running Lights on cars)? I just bought a spare bulb,and noticed the single filament. The parts guy said it was the correct PN, and I confirmed this on the online parts fiche at MAX BMW's site. I then took the tail light assembly apart to eyeball the two bulbs to make sure. They do indeed have single filaments. Link to comment
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