2009 TE310 Brake Light

Just got an 09 TE310 and the brake light does not get any brighter once i depress either brake, it just stays at a constant brightness (does not seem bright enough to be stuck at the "brake on" level. Someone mentioned that this could be the second filament inside the light. How do i check for this/ where would i find a new one? thanks

well, pull the bulb- it's probably an 1157 (the most common bulb in the US for the last 50 years). Hard to tell from the shop manual, and the parts manual says Part #8A0018246 is $12.25 (!) which may indicate it's something else (an 1157 should be about $2-$3). Consider a LED equivalent also.

Dual filament bulbs can be sometimes visually inspected to determine that one of the filaments is broken.

Regardless, take it to an automotive store (or most convenience stores) and get a new one.