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Gromit -
Jon's post alluded to it, but here's the process that turns on that light.
The junction block has the warning switch in it. The block is at the bottom of the two lines from the MC. They leak with age. The out-bound lines to one circuit are all on the same end of the block. In the middle, between the out-bound lines, is a piston with either a bump or a groove in the center. The switch bar rides in the groove/on the bump.
When the pressure in the two circuits is not equal, the piston moves to the low side, the switch bar moves and the light turns on.
I have "fed" a leaky junction block for months by keeping the MC topped up daily. When I goofed and the light came on, topping up and applying lots of pressure re-set the switch and shut off the light.
So your problem is one which causes unequal pressure in the circuits. It is unusual for the MC to do that, but not impossible. More likely is air in one circuit and not the other, or a leaky junction block. Look down at the block, the leak is usually around the piston seal and escapes around the wire connection. Or look just inside the LF tire. It doesn't take a lot of missing fluid to trigger the switch.
Have you been checking the MC reservoir daily? Loosing fluid?
Is this the car you carried the tool box on the ferry to go pick up?
Good Luck, and you can ignore the disclosure below, I know you don't need it.
Bob
:>)
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