Vehicle is a 2006 frontier with 220k miles. When I’m on the gas cruising and need to quickly brake, the pedal will feel very stiff for a half second before depressing and slowing the truck. Very pronounced if I have cruise control on the highway and hit the brakes hard without cancelling cruise first. When I’m driving normally and leave a bit more time between coming off the throttle and going to the brake it feels normal. I’m assuming this a master cylinder issue, can someone explain what is happening? Can it be repaired or should the whole cylinder be replaced? Thanks for your help!