SOHC.co.uk Forums > CB500/550

Chasing a brake bleed problem

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McCabe-Thiele (Ted):
Aren't they opposing switches one switches on - brake light
, the other switches off - oil light goes out?

honda-san:
Completely different switches:-
Brake switch, parallel thread, relies on the sealing washer to ensure no fluid leak between it and the brake junction. Oil pressure switch, taper thread, relies purely on interference when tightened (effectively wedged) in to the crankcase top on a CB750 (or oil pump body on a 400/4, etc) to ensure no oil leaks. Different terminal arrangements too (two wires to brake switch, one to oil switch).

Oddjob:
Yeah good point, forgot about it being a taper thread.

Trigger:
Different pressure regulated diaphragm between the oil pressure switch and the brake switch  ;)

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