Brake booster vacuum hose

[swat2380]

What is the part number for the vacuum hose going from the booster check valve to the intake on a 99 Yukon OBS? I have searched and searched...Truck has new master, rebuild booster, new rubber hoses, and back to soft brakes and intermittent good brake pressure depending on what the motor is doing. ABS has been cycled and cycled, last parts are the actual ABS pump, and vacuum hose/possibly defective check valve. Any other ideas? Thanks in advance

 

[SunlitComet]

get a equivalently sized piece of heater hose or softer hose that wont collapse under a vacuum.