Hi,
The light blub warning light was on today and I was expected that maybe one of the blub was burnt out. However, every bulb work just fine. I restart the engine and I notice that when I hit the brake, both the tail brake light and works and the light blub indicator was on again.

Then I realize a few things
1) When hit the brake, the parking sensor indicator was dimmed (just like when turn on the headlight)
2) WHen hit the brake without turning the head light, all the brake lights on even for the one which stay on when turn on the parking light
3) when turn on the headlight, all the brake light on, even the third brake light
4) when turn on the headlight and hit the brake, the light will be a little brighter....just a little.

Does anyone has similar issue before? How can I fix it or check it?

Thank you