Once, while flying the 737-300, I had an interesting situation:
After linning up, the twr asked us to wait a little.
Ok... parking brake set !
"you're cleared for take off"
When the parking brake was released, guess what ? Anti skid light came on ! As far as i could understand it was something with the parking brake valve, latter on the gate, after setting the brakes again, the light came off !
If anyone of you ever face something like that, try setting the parking brake again and then releasing it.
