Got a 970 that's brakes get stuck in the activated position. I've currently got the discs, actuators and covers removed. Was told on here I might be able to drive the pin out after heating it with a torch. Neighbor came over with a torch set and he heated the pins glowing hot. I know traditionally you'd heat the metal around the stuck object but he was afraid the cast might crack on us if we heated those. So he'd heat the pin and then I'd go in with the air hammer. No luck on getting those pins to come out but we did manage to get the left side brakes working. Seems the torch got that one free. I then hit it with a bunch of penetrating oil while he worked the pedal and it moves up and down pretty well now.
The right side, while it moves still gets stuck in the up position. It seemed to activate pretty easily with the brake pedal but I had to use a mini sledge to get it back down each time. The return springs on that side seem pretty loose so my next plan is to try new return springs. Also going to remove and inspect the brake cylinder on that side and make sure it isn't binding. Also going to put all new actuator springs in. Not exactly sure how this brake system works but I'm guessing the actuator springs help pull those plates together which should also help pull the actuator arm down. Maybe with new springs it will do it with a little more snap.
The right side, while it moves still gets stuck in the up position. It seemed to activate pretty easily with the brake pedal but I had to use a mini sledge to get it back down each time. The return springs on that side seem pretty loose so my next plan is to try new return springs. Also going to remove and inspect the brake cylinder on that side and make sure it isn't binding. Also going to put all new actuator springs in. Not exactly sure how this brake system works but I'm guessing the actuator springs help pull those plates together which should also help pull the actuator arm down. Maybe with new springs it will do it with a little more snap.