and then go for clutch drag,
there's a whole raft of where motion is lost with wear on the pedal clevis, seized pedal shafts, wear on the withdrawl lever and its pins
poor slave bleeding , nipple must be at the top, then hydraulics to overhaul and on and on, then displaced cover diaphragm or distorted discs
what ever,,, do the easy fixes first
but hard 1st and crunching reverse is down to something is still rotating when it should be still