This may sound far fetched but I'm guessing that in warmer weather the sensor is triggered easier, which helps turn the light off. But when its colder, whatever keeps the sensor to trigger tends to stick a bit. It might be some sort of grease in there that slides easier in warmer weather, and less in colder. Once again this is just a guess.

 

If none of that helps do this... the cap on your master cylinder has a "float" in it to monitor fluid level. Sometimes the float sticks and causes the Brake light to stay on. There are 2 wires connected to the cap. Disconnect those 2 wires and check to see if the light comes on. If the light stays off, problem solved. Go to Acura and buy the cap. I believe its between $15-20. Its a safe and easy way to check your problem. Let us know!

 

Listen to SimplyFast, he fixed my problem. We disconnected my two wires on the cap and now the light is working like it is supposed to. The dealer said 9 out of 10 problems they see like this is a bad brake fluid cap with that floater mentioned above. Now I gotta get a new cap, connect the two wires back up, and everything should work 100%.

 

Yep, I completely forgot about that...the cap tends to go south as well. Good call!

 

Just recently had a cold front come through and I have been experiencing the same problem with the brake light. I will be taking a look at the cap tomorrow. Hopefully, this is the cause of my problem as well. Anyone have a part number for this item?

 

that happened to me awhile back also. just filled the brake resevoir up a bit and the light turned off whenever i put the ebrake down.