It gets added to the master cylinder located drivers side of the firewall
A Dodge Neon use DOT3 brake fluid.
DOT 3 is the required fluid.
dot 3 brake fulid
Either you're low on break fluid OR your parking brake is set. In either case, it must be repaired.
ATF+4 transmission fluid.
DOT 3
Dot3 or Dot4
Brake fluid is added to the brake master cylinder reservoir, under the hood on the driver side.
Master cylinder low on brake fluid or parking brake not totally released
Haynes repair manual, Dodge Neon 2000 thru 2003. Book #30036
Bad fuse or bad brake light switch.
The same place you check the fluid level.