SRAM RSC Service Manual page 21

7 Place a rag over the lever body to prevent the piston assembly spring
from forcefully ejecting.
Use your hand to push out the contact adjust knob.
⚠CAUTI ON - EYE HA ZARD
Use safety glasses.
The piston assembly is spring loaded and will forcefully eject from the
lever body when the contact knob is removed.
8 Remove the piston assembly from the lever body.
9 Spray isopropyl alcohol on the lever body and the lever blade and
clean them with a rag.
Piston Assembly Removal 21