I have a issue with my brake pedal that only occurs on very cold mornings (intermittently). For a new seconds my pedal is stiff while the car is running and in park position, then after a few repeated pumps pedal responds normally. Searching online, the problem might be the power brake booster check valve, i’m not able to locate this part so i can test it, does anyone has any idea where this might be, if it exists. I heard it might be built into a hose that provides a vacuum.
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