There are several things I would need to know to answer correctly:
The fact that one brake does work means there is an underlying problem with the rest that needs to be repaired.
Usually on a car one brake working means that the other three have seized hydraulic systems in each brake and require the replacement of the cylinders or Calipers.
To replace a faulty brake caliper with a new caliper or a rebuilt caliper and assuming that is all it needs, a garage would probably charge you one hour of labor plus the cost of the caliper and brake fluid. Call your local auto parts store to get a quote on the brake caliper.
If only one wheel is grabbing, check the opposite side for problems like a frozen caliper, pinched brake line, a restricted brake hose or a bad grease seal allowing grease to get on to the rotor.
it is either bad signal flasher or bad signal switch assembly try another flasher, swap the hazards one in place of the signals one if the hazards work right now if the hazrds dont work either then it is most likely worn switch assembly(common problem in these cars) i am working on a corsica right now that has no brake lights except the third one and it is the switch assembly worn out in it, flashers are good in it
Replace the flickering light.
You have a leak in the caliper piston most likely due to rust which causes brake fluid to leak past the rubber seal. To fix, you have to either rebuild the caliper yourself or buy a rebuilt caliper from the parts store. If you buy a rebuilt caliper, it will come loaded or unloaded. Loaded = comes with brake pads. Unloaded = caliper by itself (no pads).
Try changing the light bulb
There are a few reasons that the third brake light is the only one working. One reason could be that there is a short in the wires of your main brake light. Another reason is that the light bulb has blown out.
It's a brake circuit B malfunction. So probably one of your brake lights is not working. If they are working you probably need to get the car to a shop because your anti skid system may be affected.
No fixing that one, replace it with a new one.
you have brake fluid leak in your brake system somewhere that need to be check.
I'm assuming that one of your brake light bulbs is not working
check the switch which is located above the brake pedal. needs adjusting or a new one!
There are likely one of two reasons why a brake light on a Brava is not working. Either the bulb is burned out or a fuse is blown.
Try to find out if the car have fuses for left and right brake lights. And did you replace the bulb on the side that is not working?
Check your owners manual. If you don't have one copy & paste this link. http://www.genuineservice.com/genuineservice/en/gloveboxresults
Check and clean the pedal system and the cable that it connects to. Lube any connections necessary, and make sure that the return spring is working, if your ATV has one.
Ok so i figured this one out on my own. Remove the rear tire that the brake is locked up on, if the hand brake is on, lower the lever in the car. locate the e-brake wire on the rear of the disk brake/caliper. This should be behind the rotor and caliber and is identifible by the fact that it is not a hydraulic line. You should see that it is held in place by a bracket with tension on it, hence why the brake is "locked" remove the bracket holding in the brake line in place {not the hydraulic line!!} Once the bracket is removed simple pull out the e-brake line with a pair of pliers, Shazam! the brake should release. If not a few light taps with a hammer should help. Save the bracket for the e-brake as you will need it if you ever decide to fix it. This is a temporay fix with no real long term affects to your braking system, Except the fact that you will only have one E brake working.