Seems like this should be easy to diagnose. When they are acting up jack a wheel off the ground and open the bleeder. If it frees up then its a hydraulic issue. If it still drags after opening the bleeder its a mechanical issue. This needs to be done to continue diagnostics.
Just did this this morning. Cracked the bleeders and fluid dripped out. No pressure. The calipers were both loose. Last night I couldn’t turn the tires because they were so tight. Over night, no drag at all.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
