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Jim Grant's Tech Tips
92 Mazda
4x4, Touchy Brakes
Q: I have a problem with my ‘92 Mazda 4x4
B2600 with 104,000 miles, The brakes are too touchy.It’s great on dry
conditions but in the rain or snow I have to be very careful. It may be
more touchy on the first pump and not the second. I have changed the calipers,
rotors, pads rear brakes. Any Suggestions? ....Joe
A:
You didn’t say whether it was the front or rear brakes that were touchy.
But because the brakes are touchy more so on the on the first pump but
not as much on the second pump, would indicate that the rear brakes are
not operating correctly. This would force the front brakes to do all the
braking which is not a good thing. If the brakes have truly been inspected
and are in good order then inspection of the hydraulic controls would
be next. Many, but not all, pick-up trucks have load sensing valves that
control the flow of brake fluid to the rear brakes. I’ve seen these valves
gummed-up, rusted or the load sensing arms bent or even unhooked. The
result is incorrect to no braking pressure at the rear wheels.. If the
brakes are good at all 4 wheels then an inspection of the control systems
may provide the answer to your touchy brakes.
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