Removal Procedure

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Thoroughly clean the brake master cylinder reservoir and the brake master cylinder body to remove any dirt and debris.
Using a suitable tool, remove and properly dispose of the brake fluid from the brake master cylinder reservoir.
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Radiator Surge Tank Air Separator Nut (1) - Remove [3x]
Fuel Cooler Coolant Surge Tank (2) - Reposition away
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Battery Positive Cable Nut (1) - Remove
Battery Positive Cable (2) - Position aside
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Radiator Surge Tank Bolt (2) - Remove [2x]
Radiator Surge Tank Nut (1) - Remove
Without disconnecting the hoses, remove the radiator surge tank and position aside. (3)
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NOTE:
Some components not shown for graphic clarity.

Disconnect the brake fluid level indicator electrical connector
Brake Fluid Level Indicator Switch (1) - Remove