I've got an idea for a bit of an unusual job for a solenoid.
Some trials Land Rovers use fiddle brakes, a bit like the independent brakes on a tractor.
The usual method is to two brake master cylinders in the pipes to the rear brakes, operated by manual levers in easy reach of the driver, a bit like two extra hand brake levers.
There is an anti-theft device available, which is simply an electronically operated one way hydraulic tap in the clutch pipe. Once the clutch pedal has been pressed, it stops the fluid returning, so the clutch stays disengaged and the vehicle can't be driven.
It costs about £400 last time I looked though, which sounds a bit much for a tap to me.
I want to combine the two.
I live on a steep hill and sometimes need to stop to open my gate with a trailer on. I always worry about the handbrake holding, so it would be good if I could lock the rear hydraulic brakes on too.
If I could do it electrically with a hidden switch, instead of using an obvious lever, it would be a good anti-theft device as well, preventing the Land Rover being driven, or even towed, away.
So, what I want is a solenoid that will push a brake master cylinder hard enough to lock the wheels. I don't know how much force that would take, 50kg maybe ? A longer lever would reduce the effort, but then it would need a longer stroke.
It must also lock in position with no current drain for when it's parked. So it needs some sort of ratchet that disengages when switched to release.
Moon on a stick, or is there something made for radio control models or automated machinery that's just what I'm looking for ?