If you don't know the last time your rubber lines were replaced, it's time to replace them! Rubber lines can go bad "internally". They will swell on the inside allowing fluid to go into the caliper, clamping the rotor but, because of the blockage, the caliper will bind and stick. After a few minutes, they will release. Sound familiar? You need new lines.
Rubber lines, while they eventually faail as mentioned above, give you a great "heads up" before they go. We generally prefer rubber lines for street car use.
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