truck want start on 1993 Chevrolet S10

i CHANGED THE MASTER CYLINDER and went to start the truck up and it did nothing. the lights and everything are on but it wont do anything else. its got a good battery

Asked by for the 1993 Chevrolet S10
Anything can be good one minute and bad the next. I would check all connections at the battery and starter, check to be sure is in park, just because lights come on does not mean that battery is good, takes more juice to crank engine than to turn lights on.