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Anonymous Posted on Jun 21, 2014

What causes your brakes to lock down without applying the brakes?

Rear brakes

1 Related Answer

ginko

Ginko

  • 19396 Answers
  • Posted on Nov 04, 2010

SOURCE: front and rear brakes locking

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.

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