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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

99 Suburban K2500, New SUV with a brake History
Q: Jim, I’m having some serious brake problems on our ‘99 Suburban K2500 4x4 with a 7.4L engine. Here’s the history: The rear axle seals leaked when new. Warranty replaced the seals and installed new brake linings on both sides of the rear axle. The front rotors warped fairly early on, and were replaced under warranty. Also the front brake pads were replaced. The problem is continuing brake rotor warpage (now ready for second set of new rotors at 33K), and violent brake action if the linings get the least bit of moisture on them. Is it possible that the rear linings and front pads are not compatible with each other, or not compatible with the ABS System?
Your wisdom on this please, I am about out of warranty at 36K and am not happy with the brake problems we are having.

A: Not sure about the wisdom part, but I can tell you that brake problems that you are experiencing on your Suburban are not uncommon. The ALLDATA Information System shows Service Bulletin # 99-05-24-001A addressing braking concerns that you are describing. Vehicles affected range from ‘92 to ‘99 Chevrolet, GMC, pick-ups and Suburbans . Also ‘96 to 2000 Chevy and GMC vans.

The condition is often described as a brake pull while braking or premature front brake wear. The fix requires the installation of upgraded front brake pads and rear brake shoes. Also the brake system’s Combination Valve must be replaced on Suburbans. This valve regulates brake fluid pressure to the front and rear brakes. If the valve is not replaced as outlined in the service bulletin other brake problems can result

Front brakes that are doing more than their share of the work to stop a vehicle will overheat and wear rapidly. This greater amount of heat will also take its toll on the front brake rotors causing them to warp. Also, the rear brakes should not be acting violet when wet.

One last note, I did a check at the National Highway Traffic Safety Administration’s Consumer Complaints Database and found that your vehicle is not alone with this problem. It may be in your best interest to register your complaint with NHTSA on the web at


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