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What are people using these days ?. Trying to avoid the poor quality "Lucas" rubbish from the usual places.

If you mean mean hydraulic switches used with silicon brake fluid, Harley Davidson switches seem to last longer.

Yes hydraulic, with DOT4.

Does it make a difference if you use synthetic with a brake pressure switch ?

No idea, I would doubt it.

NOS or good used ones Robin

Silicon fluid made absolutely no difference to my old Lucas switch on my 69 S. Still going strong

Andrew1967 wrote: ↑Sun May 22, 2022 5:40 pm NOS or good used ones Robin

Good used would do Andrew, let me know what you have, thanks.

I'll have a look and let you know Robin.

Accel switches (for Harleys) are supposed to be good quality (not cheap)

https://www.ebay.co.uk/itm/272756949343 ... SwsCdhHmMH

https://www.amazon.co.uk/Accel-ACC-1811 ... B001OMKH7Y

Thanks, I'll try a used one from Andrew, should be fine for now.

My friend who used to own a garage tells me if the inner diaphragm hasn't been punctured * then a good dose of air pressure can usually clear a stuck brake hydraulic switch. A rounded piece of plastic can also be used to carefull prod the diaphragm to activate the connection on the other sides. Flush out with brake fluid and try again.
* Usually punctured by the insertion of a screwdriver in an effort to 'clear-out' the blockage or obstruction.