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you have a stucked brakes, possible cause is clogged flexible brake hose, to find, compare temp of each wheel after running, the stucked brake would be hottest. check and replace, sometimes the bracket that holds the hose become rusted and compresses the hose, if so just remove rust on the bracket and problem solved. if not, replace hose.
most common cause would be a bad disk brake caliper, or bad brake hose.
the way to find out witch one, is to jack up the front of the car and put it on jack stands. put the transmission in neutral. then turn the front wheels one at a time and wile turning the wheel have some one apply the brake the wheel should stop turning immediately and then wileapplying pressure on the wheel have the person in the car release the brake pedal the brake should release immediately if not, then open the brake bleeder on the offending caliper if the brake releases then. you have a bad brake hose if the brake still does not release with the bleeder open then you have a bad brake caliper.
most likely have a bad diaphram in the brake booster that hisssing sound is vacuum leaking under hood there will be hose going to brake booster unhook hose and pinch off hose start car does hissing sound disappear if so bad booster
you will need to have the brakes checked, you may have a bad hose or sticking caliper, also if you have drum rear brakes then the rear drums may be out of round, this is if its the rear brakes that are grabbing, if it is then you may just need the drums resurfaced and also make sure theres no gear oil or brake fluid on the shoes. if the fronts are grabbing then you may have a bad brake hose or a bad caliper.
if both wheels have this problem check the flex brake hose that comes from the frame to the rear axle,if only one wheel has the problem it could be the caliper or that wheels flex hose,also check the slides on the caliper or the caliper bracket the brake pads have to be able to move after pressure is released,in most cases the slides freeze up causing one brake pad to constantly apply pressure.and there for heating up the rotor one other thing is your emergency brake cable hanging up.
Check the caliper ,and the caliper brake hose,if the caliper will lock down,and not release,loosen the bleeder screw on the caliper,if the caliper releases,the brake hose is bad,if it does not release the caliper is bad.
its common for older calipers to lock up. try cleaning the slides and lubing them. also when the calipers are off make sure the piston moves by depressing it all the way in. then drive again.
also very rare but you could have a bad brake hose causing pressure to stay inbetween the colapsed hose and caliper. this will keep a slight pressure on the side with a bad hose. but not so common like i said.. checking a bad hose by removing hose from caliper side. fluid should continue to flow out. if nothing flows out after 2 or 3 minutes you have a resriction somewhere. then remove hose from the hard line to see if fluid flows from the brake line. if fluid flows from brake line you have a bad hose. if fluid still does not flow from brake line you have other issues before the brake line. could be bad master.check master the saem way you check hose hopefully its easy. GOOD LUCK