Hydroboost

[mortten]

04 Yukon with hydroboost. There’s a hose that goes from the reservoir to a unit on the frame with an electric motor. What is that?

 

[rockola1971]

04 Yukon with hydroboost. There’s a hose that goes from the reservoir to a unit on the frame with an electric motor. What is that?

If you are talking about down low on chassis then that is your ABS pump. Up high on the firewall then that is your Hydroboost.