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Hissing from the brake pedals being push indicates that there is air in the brake system. It also indicates that the brake pads may be wore down and are not able to grab to stop the car.
The brake pedal has nothing to do with it. If air is in the system then bleed the brakes.
air coming out of the brake lines... that is if its a truck. if you aply the parking brake.
Hardness in the brake pedal can because by low brake fluid. Air in the brake lines can also cause the pedal to push hard.
If you're referring to an air brake system, you have a leak in a brake chamber... one of your emergency chambers has gone bad (if you hear it only when you depress the brake pedal, then it's a service chamber).
air in the brake lines theyneed bleed
air in the hydraulic brake system
You need to bleed the brakes. Loosen the bleeder valve on one of the calipers and have someone press and hold the brake pedal. Tighten the valve and release the brake pedal. (If you let off of the pedal with the valve loose, air will be drawn into the system and make the problem worse.)
Air in the brake system. You need to bleed the air out of the system.
dude! sounds like air brake sys.(system needs to be bled get air out of sys.)As for gettin stuck , check linkage,brake booster and master cyl.
The power brake booster is bad.
Brake system has air in it.