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Showing results for tags 'hardbrakepedal'.
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Porsche-mates, I came upon this issue a couple of days ago. I noticed while driving, the brake pedal became very hard to push down. Braking power seems to be there to some degree but the power assist is gone. I looked up some of the potential reasons for when a vacuum may not be there for the power assist, such as 1) Bad AOS - No white smoke, oil filler cap comes off easily, and no related engine codes. 2) Cold weather - so it is in the 50s in Phoenix but even when it warms a bit, the brake pedal is hard. Some other observations - not sure if related, i) Every once in a while, I get a CEL with a P0153. When I reset it, it stays off for a long time and when I go to higher altitudes, say Flagstaff or Prescott, it comes back on. Car did pass emissions last year. ii) Engine normally purrs around 7-800 rpm but at times, especially after this "hard brake pedal" issue, when the brake pedal is pressed, can go upto 1100 rpm. Recently, I've noticed that when the engine is idling, there seems to be some kind of a rattle from the back, not loud enough to be scary but enough to be noticeable. This becomes more prominent right at the point when the engine is turned off. iii) Since this is my daily driver, it has braved a ton of rain recently in the Valley here. Car is a 2000 S and has 163K miles on it and the last AOS was replaced at 102K miles. Plenty of other preventative maintenance has been performed to it, including the IMS upgrade. Brakes were recently updated as well. What could I be looking at here? Has the Brake Booster unit gone on me? Appreciate your ideas.