A few possiblities can be the brake caliper could be sticking. Does it do it during or right after braking? It could be a wheel bearing has gone bad. Does it sound like a turning howel or grind that goes faster as your speed goes faster? It could be worn center velocity (CV) axle. Do you hear a metalic clicking when simply going forward and backwards? This could also indicate worn Universal joints. If the only symptom is "locking up", it could be the rear differential gears have stripped or broken.
I have a feeling that they came with drum brakes on the rear. Most likely the unit has fell apart or it's over adjusting itself when you stop the vehicle after being in reverse. Many of the vehicle manufacturers have those drum brakes adjust when you are backing up and then using the brakes to stop. If the adjustment screw is malfunctioning, then there is a possibility of the brake over adjusting. Also, make sure that the emergency brake cable is not seezed.
Good luck
Hi it sounds as if your brake linings have broken away you will need to remove the drum to see.
SOURCE: removing rear break drum from a 2006 chevy Equinox
You need to de-adjust your rear brakes and/or slacken off the park brake cable to remove the drum as the chances are the drum has a wear lip that the shoes are getting hung up on. ( first make sure there isn't a little retaining screw holding the drum on !..visible with the wheel removed)
SOURCE: Lost power on drivers side door 2007 chevy equinox
check fuse .if fuse good you got a bad ground.
SOURCE: PASSENGER SIDE FRONT AND REAR POWER WINDOWS NOT WORKING
then it might be the motor to that window or a bad switch for that window.
SOURCE: 2005 chevy equinox rear hatch not locking
I've had the exact opposite issue with my 2005 Equinox.
My rear door is locked and will not unlock.
SOURCE: 2007 chevy equinox driver side window quit working
I had same issue, you must remove driver door panel and you will notice some wires have broken after constant open/closing of door. Reconnect wires and you are good to go !
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