IS - 2nd Gen (2006-2013) Discussion about the 2006+ model IS models

Brake Pedal gets HARD (booster leak?)

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Old 04-15-11, 10:11 PM
  #16  
Tarmac04
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did some more technical research, 95% sure it could be a bad vacuum booster one way check valve.

anyone agrees with this conclusion according to the symptom?
Old 04-16-11, 02:30 PM
  #17  
Toymota
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Originally Posted by Tarmac04
The pedal gets hard by itself (without me pumping it)
What have you been putting in your gas tank? You may have discovered the next blockbuster ED drug!

Just kidding. I just started working from home so sometimes I don't use my car for a week or two. I have also noticed the brake pedal going hard after being left off for so long. The brakes operate normally after starting the car, but I'm still interested if you resolve this issue.
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