SRAM GUIDE RSC 2015 Service Manual page 12

Place a rag over the lever body to prevent the piston assembly
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spring from forcefully ejecting across the room.
Use your hand to push out the contact knob.
C A U T I O N - E Y E H A Z A R D
Use safety glasses.
The piston assembly is spring loaded and will forcefully eject from
the lever body when the contact knob is removed.
7 Remove the piston assembly from the lever body.
Spray isopropyl alcohol on the lever body and the lever blade and
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clean them with a rag.
Piston Assembly Removal 12