5500 kodiak brake warning light ?

[new rver]

have a 04 chevy 5500 kodiak chasis.it happen once before. started it up brake warning & chine comes on the warning light under the radio.restarted couple times than went off.then came on again at start than stayed on. took it in had a burnt switch that runs the anti lock breaks.worked fine drove 9000 miles.set in pole barn for 2 mounths stared it up once in awhile no problem.started it up yesterday light & charm came on. called to take in moved it out to hook up car got ready to go started it up light went off.i know sometimes when i pull the key out the charm for key in will go off then put key back in and pull out it will go off.any feed back would be great
safe travels bob,linda & missy

[new rver]

just woundering if any body has this trouble.did it again 10,000 miles walmart start dinging . changed switch on peddle went away got home set for week went to get frig fixed stoped at mc e ds started again.it seems it happens on start up and booster moter on brake does not run.any info would be great
safe travles bob,linda & missy