I have a 2002 H2 and noticed a leak under the vehicle basically under the driver compartment. Noted it was definitely break fluid and see the fluid is low. Looked today to see about a repair and note all fluid is gone from the reservoir. What is this part that all of the brake lines appear to run through under the vehicle? A booster?

thanks

 

Any Help on the part identification before I have to tow this in?

 

I think it's called a junction box or maybe what you're is the power brake booster