My brake pressure switch failed last week and it has taken me a while to get a replacement having to order one with a 1/8" NPT thread such as the
Intermotor 51600.
I did a bit of a search online and found a few others complaining about how long they last and a mod to do to my wiring to add a relay so the 3.5 Amps
of current goes through relay contacts rather then the switch it self.
May be worth considering if anyone has similar problems.
homepages.donobi.net/sufuelpumps/Other_Subjects/Electric
al/General/Brake_Light_Relay.pdf
Came off an MG forum.
I did a slightly different wire up but works the same.
Adrian
[Edited on 24-10-11 by AdrianH]
had the same problem adrian. i got through 3 pressure switches before i gave up. i tried the relay option and it made naff all difference. i ended up fitting a micro switch to the brake pedal and it has been good as gold since.