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There are two filaments in the lamp. One for the tail light and a brighter one for the brake light. First thing I would do is pull out the bulb and check the filaments to be sure that they are both good. If the lamp appears to be good you can have someone hold the brake pedal down and check for voltage.

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16y ago
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14y ago

Check the bulb--should be a double filament one may be burnt out(Smaller filament is Stop light) and backfeeding when tail lights are not on Check the socket may have some corrosion Check the ground - Check the bulb--should be a double filament one may be burnt out(Smaller filament is Stop light) and backfeeding when tail lights are not on Check the socket may have some corrosion Check the ground -

Just a side note Some brake light problems are also caused by a faulty turn signal switch. I was having problems in my 97 firebird where one side would work then not work and then the other side would work and not work. After a long check of the whole system it turned out to be the turn signal switch. I replaced it and all is good now!

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5y ago

Great chance it is a bad bulb. There are 2 filaments and one is probably bad.

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Q: What is wrong if the tail lights work but one brake light doesn't when the lights are on?
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