Brake light always on

[Carribdis]

Morning all,

Any ideas for why when I turn my lights on, one of my brake lights comes on permanently? It gets brighter when I press the brake pedal, but then never goes off. Just one side, the other one is working fine.

Thanks!

[brettfield999]

Good Morning,

Is there any chance its the rear foglight?  The switch is on the indicator stalk

[Carribdis]

Update, it's actually both brakelights that stay on. One of them had a broken filament so just looked like it wasn't on, but now I've replaced the bulbs and see it's both brake lights that stay on.

Def not the foglight switch, I double checked

[Webrondek]

Bad earth

[Carolyn]

+1.

[SteveJ]

Knackered (or badly adjusted) switch on the brake pedal. Bad earth usually causes Christmas tree lights when the indicators are flashing.

[smarty72]

Have you changed a rear bulb recently?

I once changed a twin filament brake/position bulb and had a similar problem.  Turned out that the bulb was defective and the tail of one filament was bent across touching the other.  I noticed when the dash lights illuminated every time I touched the brakes.

[beavisrules]

Wait, isn't the brake light dual filament and is normaly on with the lights?. Sounds like how they normaly work.

[smarty72]

Yes, it's dual filament.  A 5w filament for a position lamp and a 21w filament for the brake lamp on a different circuit.

[Carribdis]

So they're 2 rear lights? A separate bulb, and also 1 filament which is always on, then the brake lights s just the extra filament coming on?