Bet rear "sliders" are seized,and have been for some time... Making them all but useless. An inspection will reveal the inboard pads thinner than outboard pads... I removed the ABS years ago. It's quite primitive by today's standards. If it's working for you fine. If not,it isn't worth fixing in my opinion. It can be easily removed,as many (including myself) have done...
Winner 2001 Road Course (prep. class) Detroit,MI
Winner 2006 Drag race (SS class) Indianapolis,IN
Quickest event reaction time .013sec. (final-round)
Class Winner 2014 Charlotte,NC. 2016 NOLA car shows
Winner 2019 Road Course (prep.class) Pittsbugh,PA