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Q & A: Brake Detection Switch

Thursday December 13th, 2007
Q & A, MGA, MGB, MGC, MG T-Type, Midget
John,

1969 MGB

Brake detection switch leak problem:
Break fluid is leaking out of the brake detection switch by the wires,
(not at the threads) of the 5-way union/pressure valve assembly. My
question is can just the switch be replaced, the union/assembly or does
the whole union/assembly and switch need to be replaced.

Thank you.

Keith
Keith,

The brake warning light valve body is the problem. There are two
little O rings in there, one or both of which are leaking. You have three
solutions:

Remove the switch and replace the switch ... read more