The circuit is pretty basic. It's just a big loop from the cluster and back. If anything in the loop either breaks or goes to ground, the light comes on. Early cars were prone to burning out a resistor on the cluster main circuit board. Even though you have an 89, it's possible that's your problem. There are other main board faults that can cause the same issue. Also, it's brakes and not breaks. In other words, if you don't use your brakes you'll likely find something else breaks.
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1986 Delphin 528e - Roof rack equipped lumber hauler.
1989 Zinnoberrot 325iX Sedan - I miss this car. (Deceased)
1998 Avus Blau 328iC - Someone else's project now
2008 Platinum-Beige X3 3.0si - Current project
2012 Alpine White X3 xDrive35i - My new snowmobile.
2020 Estoril Blue 440i xDrive cabrio - This car is a blast to drive.
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