It's not meant to do that... is it?

[BMCfaz]

Just had my 54 plate Gen1 MOT'd and, apart from an iffy horn, now replaced, no problems from the tester.
I did notice, however, that when he was trying the horn, the brake light came on. This is not something I've come across before, but, as the tester wasn't bothered, should I be? Anyone else had this happen and is it a sign of impending disaster or something I can safely ignore?

[ghostbiker]

dose it do it with the new horn or just the old one?

My first thought would be a bad earth but i have not heard of the horn turning on the brake light before. i offten see indicators dimming lights and have seen a brake light that made the horn sound once to. but that was caused by a bad wireing set up when a mate built a trike lol

[BMCfaz]

Does it with the old and new. Press the button and on comes the light! At least the horn works OK now.