Check over the calipers though since the rear ones not being regular push types tend to get sticky in there old age and can put out uneven pressure even if the ebrake cable is evenly pulling on them. The rear calipers piston rotates while being pushed out to compensate for pad wear but they can stick a little in certain places causing one to grip more than the other when even pressure is applied by the ebrake cables.
seriously dude buy project mu pads and be done they are amazing bro