The brake fluid warning light is on in park but when I let the handbrake off it goes out. the reservoir is full and the sensor has been rep[laced. If we shake the sensor unit new and old the light flickers.
"If we shake the sensor unit new and old the light flickers." - Would suggest to me the wiring close to the sensor unit, or crappy connectors at the sensor unit. You may get some insight by gently waggling indvidual wires (maybe carefully holding everything else still).
Intermittent faults like that are a sheer pain.
You may find its a common fault and mentioned in online fourms.
Gary
December 2014
Hi you probably have a wiring fault ..on a 23year old vehicle the fault could be anywhere
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lorries/trucks.