dot3 or dot4 brake fluid 2001 Dakota

I used to have really funky brakes for the first few times I used them in the spring. Calipers were really sticky for a while then would be ok. Changed rear end, reused same brakes, flushed with then filled with DOT5 and have not had sticky brakes since. That was like 15 years ago. Have not flushed or replaced anything since and fluid is still clear