535i with "Brake Circuit Failure" message

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Location
Lonsdale, MN
#1
1990 535i, there's no brake lights. Start the car, step on brakes and display shows "Brake Circuit Failure, check owner's manual"

I don't have a manual, and Bentley book doesn't help at all.

All 3 light bulbs are good.
 
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4,917
Likes
18
Location
Reading,PA
#2
Most likely it is the brake switch on the pedal. This was a very common problem on the 3 series in the 90s, my guess is that the 5 series used the same switch. Check/replace that switch.
 


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