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When I switch on the lights, the brake light is not on,
but it works when I depress the brake.
Should both the tail light and the brake light stay on when you switch on the lights~? and when you depress the brake, the brake light grows brighter~ right?

Thank you.

 
Rep Power: 307

Are your licence lights operating when lights on ??
Front marker lights on corners when lights are on ??

The brake and tail bulb has 2 separate filaments.

 
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When I switch the lights on, all front headlights, front marker lights, front and rear signal lights, licence lights and the tail light(the one on the trunk) are all functioning properly, except the brake light.

reverse lights work too~

 
Rep Power: 307

If just one light is out...? you likely need a bulb.

 
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I have replaced the bulbs already~ still it's not working when I swtuch the lights on~ though it lights up when I depress the brake