Quote:
Originally Posted by Mxfrank
Exactly right. Water in the fluid boils when the fluid is hot. Water vapor compresses, so no brakes. Once the fluid cools, water condenses, liquid water is incompressible, so brakes return. The first thing to do is get the brake system flushed.
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If he flushes he needs to do it while the brakes are hot because the bleed screw is at the top and water does not easily get up top if it is condensed at the bottom. It would also work better if the Caliper Pistons were pushed all the way in allowing less space for trapped water.
But, the sticky caliper piston/s and Master Cylinder with internal leakage are also possible. But, one would think that if it was the Master Cylinder the pedal would sink ever if very slowly.