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This is why the BRAKE PEDAL gets hard when braking with the engine off. EXPLANATION.
My brakes is making a hissing sound (like air coming free) when I brake but it isn't affecting the brakes, what could it be? Could it be a leak maybe? : r/Cartalk
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Why Is My Brake Pedal So Hard to Push and How do I Fix It?
C/S hard brake pedal and check engine light on. Tech A said it's a failed Vacuum pump and cam sensor. Tech B found... : r/Justrolledintotheshop
WHY BRAKE PEDAL IS HARD. WEAK BRAKES, HARD BRAKE PEDAL EXPLAINED
