The brake tell tale indicates one of three things:
Hand brake on
Brake fluid low
Accumulator pressure below 1800 psi
IIRC the handbrake and brake fluid low level switches are normally open and close to illuminate the tell tale so disconnecting them will reveal if one of them is the problem.
The accumulator pressure switch is normally closed unless the pressure drops below 1800 psi but the signal goes through the lamp driver module (which is basically a solid state relay) to invert it. Espritmon will indicate if this is he cause of the tell tale being illuminated.
Hand brake on
Brake fluid low
Accumulator pressure below 1800 psi
IIRC the handbrake and brake fluid low level switches are normally open and close to illuminate the tell tale so disconnecting them will reveal if one of them is the problem.
The accumulator pressure switch is normally closed unless the pressure drops below 1800 psi but the signal goes through the lamp driver module (which is basically a solid state relay) to invert it. Espritmon will indicate if this is he cause of the tell tale being illuminated.