[AlanJohnson]

This is a good write-up, thanks Richard. It helped me get my tag brakes changed.

I do have one question. There is a wire that follows the air line down to the brakes (or hub). It looks like a 1/4" air hose, but it appears to have two leads inside. it. My wire is broken (for once I didn't do it). It appears to have been broken for a while... so I'm guessing it is "optional". But I would rather know what it is supposed to do and if I need to repair it. It looks like it won't be the easiest thing to fix as the inside looks more like the inside of a spark plug wire.

Thanks,
Alan