Our car has been sitting parked for the past 8 months, today we tried to move it and the back brakes are locked, and the back wheels will not move? What could be the cause of this?

Have you tried applying foot brake before releasing park brake. You will need a good battery to release the brake with ignition on. Also you need to depress footbrake to move shift lever from PARK

Was the parking brake on? Sitting that long it may be hanging
up a little. The cable may have a little rust on it and it's not releasing
all the way. If thats the case you may be able to feel the back
wheels after driving a little and they will feel hot or you may even
smell the brake shoes wearing.

Hi,
If you have access to a jack, and some kind of blocking (for safety), remove the wheel,and with a hammer, rap firmly around the break drum. Be careful not to strike the studs that hold the wheel on. Maybe want to screw the lug nuts back on a way so as not to damage the stud threads in case you hit them with the hammer.
By sitting the brakes have gotten "frozen" sort of rusted to the drum. The rapping of the hammer usually frees up the brake shoes.
Make sure the parking brake cable is not rusted tight also.
Wayne

A few things come to mind. First, If the vehicle is in 4 wheel drive or all wheel drive, the transfer case may be the culprit. Try slecting Neutral on the transfer case & see if things change. Second, the front wheel bearing may be siezed up. It's a fairly simple replacement of the sealed cartridge. Third, this is a long shot but I've seen cases where the front axle shaft U-joints have caused the wheel to bind up if they are rusted tight.
Also, If you drove it to the mechanic, is the wheel really locked up, or is it only when it's parked? If only when parked, my first point makes the most sense.

hi, if the car has been sitting all this time with the parking brake on then the chances are your brakes are siezed on, now the parking brake locks the back wheels so this is where you should start looking for problems.

now the front wheels should be ok you can try them by jacking each wheel up and try spinning them by hand the front will be stiff but should turn with a bit of force.

how ever you could also jack the back wheels up to check they are solid if they are then you have two options the first would be to give the back wheels a few hits with a big hammer, you will need to hit them pretty hard and doing this should free the brakes enough for you to get the car moving. do this to both sides and you should find you can then use the car.

if after doing this they are still **** then your going to need to take the back wheels off and get a big hammer and keep hitting the back drum till the brakes free up, you wont be able to get to the brakes until they have freed up a bit as the brakes will be holding the drum onto the hub so you need to get them freed up first.

if you try forcing the car to much you can damage the drum at the back beyond repair so be warned.

hitting the middle of the back wheels with a sledge hammer will usually free the wheels up allowing you to move the car once it has started to move the brakes should free up over use.

your brakes wont be much good to start of with as they will be badly corroded so bare this in mind when driving.

you may need to hit the center of the wheels a few times then try moving forwards and backwards then you may need to hit the center of the wheel again, it may take a while but it will free up if you keep going.

the red brake light tells you you are low on fluid or that your parking brake is engaged....the abs light tells you your anti lock braking system is malfunctioning. get the car up to 40mph and SLAM on the brake pedal. the pedal should pulsate and the wheels should as well. if the wheels lock up and you slide to a stop, your antilockbrake system is malfunctioning and you should have a certified mechanic check it out......tires plus and midas both do free brake inspections.......

you mean parking brake cable? loosen parking brake cables put drums on , and adjust shoes till they lightly drag, now apply brakes a few times and check the adjustment again, if all ok, now adjust park brake cables, you want to adjust so park pedal goes 5-8 clicks till the wheels are "locked up" and the wheels spin free with the park brake off

It sounds like the parking brake return spring has broken or come loose. The only way to know is to pull the wheel and drum and take a look. It sounds like the pads are still closed against the drum and haven't released. Hope this helps.

I thought the caprice had disk on all wheels?? But it sounds like it's time for the rear brakes to be serviced. If you do have rear drums the pads could be worn and the shoes are slipping and grabing. You can try backing up in a empty parking lot and backing up and giving full brake application. About the 7th application would reset the brakes, if that does not help then the breaks need to be serviced. Good kick

Brake interlock, your foot needs to be on the brake to shift out of park. If you are doing that and you still can't shift then check all your fuses, the lock circuit may be out