Anyone have their brake pedal go rock hard on hot days? - Toyota Yaris Forums - Ultimate Yaris Enthusiast Site

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Anyone have their brake pedal go rock hard on hot days?

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07-28-2009, 11:20 AM	#13
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	There is a vacuum check valve on the brake booster. If that valve fails it will cause the pedal to become mighty hard. You can unscrew it from the booster and blow in either side to see if it is OK.

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