Question about Jeep Liberty

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Front and rear brakes locking up on 2003 jp liberty.seems to happen more often in warmer weather. can be driving and they lock up without applying brakes, free up after you let it sit.

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  • maciasjim Nov 04, 2010

    front rotors calipers and lines were changed in the front. could it be brake fluid contamination or do you think it might be the master cylinder ?

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  • Jeep Master
  • 19,396 Answers

Hi.

If this happens when driving, you may need to check the ABS system. The ABS module can be scanned using a com utility available at the dealer or at any authorized garage.

Check the master cylinder, that is the hydraulic system that connects to hydraulic control unit (HCU ) and regulates pressure in brake lines, it is located at base of reservoir. There had been a recall affecting 2008-2010 Jeep liberty because of possible brake locking. The 2003 models are not affected.
There is a master cylinder recall affecting 2002 models, but that does not cause locking but leaks, and reduced breaking power. I posted at the end as note. Check the master cylinder as well by the way.

Under all conditions, the brakes must be taken apart to check parts the brake system. Parts expand more in hot conditions. If there is a mechanical problem in there, this can contribute to lock up more often when weather is hot.

Regards.

Ginko.

Note:Jeep Liberty 2002 master cylinder recall:

Item Affected: SERVICE BRAKES, HYDRAULIC
Date Announced: 3/13/2006

Description of Recall:
CERTAIN AFTERMARKET BRAKE HYDRAULIC MASTER CYLINDERS SOLD AS REPLACEMENT BRAKE CYLINDERS FOR CERTAIN FORD, DAIMLERCHRYSLER, AND JEEP PASSENGER VEHICLES. THESE BRAKE CYLINDERS WERE SOLD UNDER THE BRAND NAMES OF NAPA, RAYBESTOS, AIMCO, AC DELCO, CARQUEST, BENDIX, AND WAGNER. ONLY PRODUCTS THAT WERE MANUFACTURED FROM JULY 27, 2005 THROUGH JANUARY 17, 2006 (DATE CODES 0529 THROUGH 0602) ARE SUBJECT TO THIS RECALL. WHEN SUBJECT TO VERY COLD TEMPERATURES, AN INTERNAL SEAL IN THE MASTER CYLINDER COULD LOSE FLEXIBILITY AND MAY CAUSE BRAKE FLUID TO LEAK.

Action Needed To Fix It:
AFFINIA (BRAKE PARTS, INC.) WILL REPLACE THE SUBJECT BRAKE HYDRAULIC MASTER CYLINDERS FREE OF CHARGE. THE RECALL BEGAN ON MARCH 20, 2006. OWNERS CAN CONTACT AFFINA GROUP CUSTOMER SERVICE AT 1-800-323-0354.

Posted on Nov 04, 2010

  • Ginko
    Ginko Nov 04, 2010

    Hi.

    More than brake fluid contamination, brake fluid must be bleed properly, to ensure that there are no air gap. Air gaps do cause brakes locking up on their own and staying locked however. Same if fluid was contaminated, at most you had reduced braking power and leaks.

    This model has ABS. If lockup occurrs and persists while driving, then ABS is definitively involved.

    Master cylinder normally do not cause lock up, but leaks, pedal going down and low or erratic pressure in lines. Since some of the master cylinders mounted in Liberty from those years were quite dodgy, I would also have a look at this part, so to exclude possibility even if remote.

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