Replace all your rubber brake hoses. 2 in front and one more in back. They absorb somethng out of the brake fluid and swell closed. If one did it, the others will soon follow resulting uneven braking. I've been getting my 250 road worthy, one rear was totally blocked, the other worked only one-way. I replaced all 4 calipers with rebuilts, they were only 65 to 85 $ each. The rotors are cheap too. Something if you do yourself, it costs $300 in parts -rotors. The rotors are ~$150 for all 4. Under $500 for new brakes.