Brake light stays on when using rear brake pedal
I took my '01 for its MOT last week. The MOT tester called me in to the garage and I feared the worst!
He said, "I'm not going to fail it, because it is too petty, but you need to do something about this."
He then showed me that when the front brake lever was applied, the brake lights functioned normally, going off when the brake lever was released. The rear brake pedal, when depressed, also caused the brake lights to come on, but the light stayed on when the pedal was released. He then physically lifted the pedal up and the brake light went off.
My understanding is that the brake pedal has no return spring and that the brake pedal return is caused by the hydraulic pressure in the system.
I have never adjusted the brake light switch settings to cause the light to come on sooner or later, so this must have worked originally.
The rear brake gets very little use, so this is a case of something detiorating through lack of use. The question is - how do I fix it? I sprayed some WD40 around the pushrod, lifting the rubber housing / dust cover and giving it a generous squirt and worked the pedal hard for about 15 minutes. It didn't make any difference.....
Do I need to dismantle the switch and degrease, clean and regrease everything, or is it the brake hydraulics that I need to look at? I don't fancy bleeding the system. Woody?