Brake fluid leaking...

2000 Sonoma 4x4 w/ rear disc brakes...I'm losing fluid from a black box on the driver side rear, mounted near the frame. Is it a booster of some sorts? It's blowing fluid all over the axle and spare tire.
Not a great time for this to happen of course.:frown:

Did you find it Josh?
The black box is the vapor canister for collecting fuel vapor when the engine is not running. Probably a brake line spraying fluid on it when you hit the brakes.