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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

'97 Chevy Silverado, Brake Pulsation

Q: I own a '97 Chevy Silverado that has been totally rebuilt by national franchise. New pads, resurfaced disc in front and new drums and all in rear. After all of this, the brakes still pulsate, not as bad as it was. The shop even resurfaced the front rotors a second time. It was a little better but not perfect. Sometimes it stops smooth. The brake shop is saying it could be a bent rim or out of round. As nice as this truck is, it should stop smoothly. I have 64k miles and under ext warranty- gm protection plan. The salesman from the dealer is giving me the run-around with advice in this matter.

A: Because brakes are a wear item it's difficult to place them as a warranty issue. Asking a salesman for advice on braking problems puts a grin on the face of about any tech reading this article. I'm not sold on the bent rim as being the cause. Why? The problem is during braking only. A bent rim will cause a shake or vibration as the vehicle is being driving and will not change if brake work is done. You're going to want a tech to get serious about pining down the cause for your brake shake and that might take an hour or more. My approach would be to isolate the front brakes from the rear and test drive the vehicle. This allows one to determine if the offending brake is at the front or rear of the vehicle. Once the problem area has been determined it is time to take measurements. Not just of the brake rotor or drum, but of the surface that they are bolted to. A brake rotor or drum can be machined just perfectly, but if what they're bolted to is not then a brake shake will occur. It isn't a matter of looking in or outside of the box, it's making sure the box is built right.

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