From an article in Kit Planes. https://www.kitplanes.com/aircraft-brakes/
First Surprise—Heat
One fairly warm summer day I landed at Milwaukee’s Mitchell Field to
visit my parents. The landing was followed by a rather long taxi to the
FBO, including multiple stops and possibly some inadvertent brake
dragging, which often accompanies steering a castering nosewheel plane.
I thought nothing of it until returning later that evening and finding
two large puddles, one at each main wheel. How nice—there was all my
brake fluid on open display, clearly indicating that this bird was not
going to fly anymore that day!
Having heard of the heat problems (including some fires) that Cirrus had
in their earlier days, it didn’t take me long to figure out that the
heat of substantial braking, aggravated by tight-fitting wheel pants,
had flattened the O-rings in the brake calipers and allowed the fluid to
pass by. A quick cab back to my folks and snatching one of their cars, I
drove 100 miles home and the next day came back equipped with new
O-rings, fluid and bleeder—a genuine “field repair.”
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