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2018 XT5 Platinum, 2014 S550
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1,653 Posts
Discussion Starter #1
Noticed that more than a few times when I get into the car to start, the brake pedal is extremely hard, just like when you shut off the car and press the pedal a few times and release the pressure. No other problems other than when you Press the Pedal to start some times it is normal other times it is not.
 

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2011 SRX
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96 Posts
My 2011 has identical behavior, but only after two or three days of not using. The Factory Service Manual lists a vacuum brake booster, so based on cars I have owned in the past there is a leak "somewhere" in the vacuum system. It may possibly be the vacuum brake booster itself.
 
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