Front emergency brake? Do you mean a frozen cable? If front brake is locked may be a frozen caliper Emergency brake tied to rear brakes only
There are a couple of thing that could cause this. You could have a caliper or cylinder locked up or the emergency brake cable could be frozen up. It is best to have it looked at right away. You may have driven the vehicle with the parking brake applied.
no
brake light switch would be most common cause
Brakes locked, wheel bearing frozen to spindle, emergency brake on.
If the tire locks up when you apply the brakes and you have drum brakes then you may have brake fluid leaking onto the brake shoes. If you have ABS then you may have a bad wheel sensor. The adjusters on the brake shoes are out of adjustment or broken. Springs or hold down hardware may be broken. Cracked brake linings. Backing plates are worn out.
Rear brake cylinders or calibers are corroded and need to be replaced. Also drain the replace all brake fluid.
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.
A blown out rear axle seal will cause grease to leak out into the brake drums
Major failure. Remove the cover and the cause should be easily visible.
one could be the lines need bleeding
the brake has seized take the wheel off and beat the brake with a hammer