2021 GMC Sierra 3500HD 6.6 duramax diesel

[Corey Smith]

I experienced a fluid leak under my truck yesterday. Im wondering what the fluid was it dripped hard from a hose until the fluid was gone. 

Edited May 11, 2022 by Corey Smith
Added another pic

[Duelin]

On page 45 of your GMC 2021 6.6 Duramax Diesel Engine Supplement Manual there is an over view of the engine compartment. Hope this helps.

[dsr611]

On the left is "Low Temperature Cooling Circuit Coolant
Reservoir and Pressure Cap"

 

Middle is "Brake Fluid Reservoir"

 

Right is "Engine Coolant Surge Tank and
Pressure Cap"