In order to see the brake release mechanism, you will either need to tilt the washer back and take the bottom panel off or use a mirror. When you rotate the pulley, the cam dog should rotate towards the brake hub dog and a gap should open up between the cam hub and brake hub. If this is happening, then the brake release is probably ok and if you rotate the pulley hard and fast and the metallic clanking sound you hear is the two dogs hitting each other, then the brake release is again, probably ok. This means something is jamming the inner tub from turning. Could be clothing between the tubs, a seized tub bearing, a worn split ring (drive block) or the inner tub hub is bad. A worn split ring or bad tub hub can causes the inner tub to rub against the outer tub preventing it from rotating. You will need to remove the agitator and inner tub to figure out the problem.
BTW, make sure the transmission pulley nut is tight. A loose nut can prevent the brake release from working.
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I have a special topic for tonight's Office Hours webinar on electric circuit troubleshooting and EEPs. If you've taken the Fundamentals course or watched any of my Youtube videos, you know that EEPs are a topic near and dear to my heart. EEPs = Electrically Equivalent Points. Identifying EEPs on a schematic is a key skill for any appliance tech today. Another special feature about this Office Hours: in addition to the usual Academy students and Professional Appliantologist members, Senior Appliantology Fellows and Legacy Techs at Appliantology are also welcome to join us for this Office Hours. Just click into the topic below to RSVP and to get the connection info.