One problem related to brakes failed has been reported for the 2001 BMW 525. The most recently reported issues are listed below.
Power brake servo failure due to water accumulation. Driving the car and attempted to stop when there was suddenly no power brakes. Dealer indicated that it was caused by a bad vacuum line. When replacing the vacuum hose, I found the brakes booster (servo) submerged in 6 inches of water. After draining the water and disconnecting the vacuum hose a large amount of water drained from inside the power booster/servo. Car ran fine after repair. 1 week later, on 1/16/12 during sub-freezing temps, there ws no brake pedal function at all. Extensive web search found several threads devoted to the problem. . Read more...
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