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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

87 Plymouth Voyager, Front Brake Lock-up
Q: This is in regards to an '87 Plymouth Voyager front brake problem. I have changed the front brake calipers (both) and when you use the brake, it will engage, stopping the vehicle with no problems but will not release. This is only after driving for about 25 - 35 minutes and using the brakes. The vehicle will lose power because of overheating due to the binding brakes then shuts down. It will be ok to drive again as soon as the brakes cool down and retracts to normal position. What could be the possible cause of this problem? Thanks in advance...........Phil

A: The problem with your brakes is that the brake fluid cannot return, get back to the brake master cylinder when the brake pedal is released. The most common cause for that type of condition is incorrect push rod adjustment to the brake master cylinder. Whenever the brake pedal is applied and then released, the pistons in the brake master cylinder must retract to the full rest position. If these pistons do not retract completely they will cover/block a passage in the brake master cylinder that allows the brake fluid to return when the brake pedal is released. As the brakes heat up, the brake fluid absorbs some of the heat and expands. If there is no place for the brake fluid to go, pressure will build in the system and the brakes will apply. This creates more heat and more fluid expansion. The result, is smoking brakes and a vehicle that does not want to go. Have your technician inspect the brake pedal push rod to the master cylinder adjustment.

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