my 2004 jeep liberty brakes keep locking up but after a wile they un lock, what is happening and what must i do to fix it....

If both sides are locking up then this is not a solution. If one side only is locking up, it might be the rubber hose extending from the brake caliper to the metal line mounted to the frame. Occasionally, the inside of the hose will crack allowing pressurized fluid to "balloon" thus swelling the line closed. Given a short amount of time, the fluid will depressurize allowing the wheel to rotate, but will re-inflate when brakes are pressed. To check;jack up offending side and carefully loosen the bleed-off located on the caliper(be careful, it may have a high buildup of fluid pressure) If this was the problem, after bleed off, the wheel should rotate freely.

Our jeep liberty 2004 we put new breaks new break pads and new calibers on it but we can go half way down the road and the breaks lock up we have to wait an hour to go again and it does good what can we do to fix this

When driving my Jeep Liberty and stop by itself the brakes get hard and lox what can I do

My Jeep Liberty does the same thing.......wheels lock up and car will not move I jacked it up....both sides on front, wheels would not move..... I loosened the bleeder valve and a shot of brake fluid shot out, tightened screw, and wheels now move Have not gone any further with problem, however there is a sign that fluid is locked in caliper and will not release brake Dealer was surprised when I called and had no answer Will post more later when results are known

High probability it could be bad rubber brake hose as the other poster noted. You have five rubber hoses in your brake system: one at each caliper and a center hose at the rear axle that acounts for axle/suspension travel. As noted above the inside of the hoses can deteriorate and cause the fluid to not release after applying the brakes. A sure sign of this is that the brake at a specific caliper releases after you open the bleeder, or in the case of rear brakes if the center rear hose is bad it can lock up or cause dragging on both rear wheels but will release both when just one of the rear bleeders is opened. If you find a bad or failed hose I would suggest you change them all as whatever caused one to fail, such as overheated or contaminated brake fluid or just plain age, has most likely left the others in poor condition. This is a common problem and fairly easily remedied as the hoses are not that costly at A1Auto or Parts4Less online. Please be sure to flush all of the old brake fluid out of the system and replace with the correct fluid from a sealed container as DOT 3 brake fluid atracts water and over time can have its boiling point lowered significantly by water contamination. Other common causes of brake lock up are siezed caliper pins (evidenced by unequal pad wear left to right on a caliper) and lack of lubrication on the pad guide rails or a piston not returning causing the pad stay applied, in this case the brake will NOT release when the bleeder screw is opened. This would of course be remedied by replacing the caliper.