The first thing I noticed was that the right and
left front brake rotors had a blue tint. The left
front pads seemed to be equal to each other, but
the right side was not. I then pulled off the
wheels and calipers to check the pads up close,
where I discovered that the right side was
wearing very unevenly. The inner pad width was
down to 1 mm and the outer pad was at
approximately 2.5 mm, which suggests that the
brake pads are getting jammed or stuck.
I also noticed that the caliper carriers were
rusted. The caliper carriers are where the brake
pads sit. Upon further investigation, I found that
each pad was wearing unevenly (high on one side
and low on the other). The pads were not floating
and instead were getting stuck in the carrier and
preventing the brake pads from properly
addressing the rotor surface. This started to
cause abnormal heat buildup in the brake pads
and rotors. When the brake rotors overheat, they
lose their shape and thus cause the pulsation.
The reason my customer was only noticing the
shaking on the freeway is that city driving does
not get the rotors hot enough to cause the
distortion. The blue coloring I mentioned earlier
was caused by the constant overheating of the
brake rotors.
After diagnosing the car, all I had to do was
change the front brake pads and rotors and the
pulsating went away. My customer can now drive
happily on the freeway without worrying his
brakes could go out. Problem solved.
Matt Pataky
https://www.losaltosonline.com/special-sections2/sections/on-the-road/47438-matt-solves-the-mysterious-case-of-the-professor-s-brake-shake

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