ASR brake system warning light comes on after 10 minutes of engine running even when stationary - any idea what may be the cause?

Also the battery warning light does not come on - don't think it's the filament as it flashed on once when ignition turned on, but not since.

Check that the fuses on the dash and the top of the battery box are all ok.....also check the wiring by the drain point for the rad in front of the gearbox....some two wire connectors for the alternator break.....really need a fault code diagnostics to see what is "tripping"