I ride a set of Hayes HFX Comp (plastic master cylinders) that are probably 4 years old. Today on a loooooong steep fireroad descent I was on the brakes for minutes at a time. I stopped to give my hands a quick break and when I started going again the levers pulled almost all the way to the bar with little braking effect. I was able to stop and then I pumped the levers and things went back to normal. This happened again when I stopped one other time.
What's causing this? Did I boil the fluid? I don't remember the last time the brakes were bled, it was at least 1 year ago probably more.
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Thread: Did I boil my brake fluid?
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