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Sticking brake calipers. This can be caused by moisture in the brake fluid which will cause the calipers to rust. Replace the calibers and replace all the brake fluid. It can also be caused by driving with your foot on the brake.
Warped brake rotor(s). Brake pads and calipers should also be inspected.
Accumulation of brake dust over time will cause the calipers to stick and the brakes will heat up from the friction. They might need cleaning and relubing. Driving with your foot resting on the brake pedal will also do it.
No. air in brake lines will cause you to have a mushy pedal or no brakes at all. normal causes for brakes to drag are either bad calipers/wheel cylinders or rubber brake lines to have deteriorated on the inside forming a kind of one way valve or the emergency (hand) brake cable is hanging up/frozen.
This problem occurs mostly with disc brakes. Over time moisture can condensate inside the calipers causing rust and the calipers to stick. This can cause excessive brake wear. Ford SUVs are especially prone to caliper problems and the Explorer line often wore out the brake pads within 10k miles..
Warped brake rotors will cause pulsation (or vibrations at high speeds) when the brakes are applied. This may also go on to misalign the calipers and cause other vibration related damages.
If brakes lock up on a 1999 Hyundai Sonata there may be a problem with one or more of the brake components. Improper brake fluid mixture or leaks in the lines will cause the hydraulic calipers to malfunction. The entire brake system should be checked for the safety of the driver when dealing with this issue.
Your power brake booster may be defective. You may have a vacuum leak or the booster itself could need replacing.
No. If your calipers are leaking, they need to be replaced. Calipers leak because they're worn out, or because you didn't change the fluid and it corroded the inside of the piston bore.
The rear brakes are called a dual servo brake system... it uses one shoe to activate the other in a braking situation. When the rear brakes are over adjusted the slightest touch of the brake pedal will cause them to engage. what is actually happening is your rear brakes are engaging before the fronts even get close. You need to either back off the adjusters yourself if you know how or take it to a garage and have them back them off.
After changing the brakes the first few times you press on the brake pedal it will go to the floor; that's because the calipers haven't been pushed back to position. Remember that you had to retract the calipers completely before you could put in the new brake pads. Sometimes it takes a few pumps before the calipers are back in position. Make certain that the brake fluid is all the way up, then bleed the brakes again, and watch that fluid level. If it goes low for just one pedal push then you'll suck air again and you'll have to start over. Just one bubble of air in the brakes will cause trouble.
You probably did not lubricate the calipers when you changed them and they are sticking. Or its entirely possible that the rotors are too thin. Always clean and lubricate the brake assembly before reassembly.