Lexus RX 450h 2010 Owner's Manual page 487

4-3. Do-it-yourself maintenance
Brake fluid
■ Checking fluid level
■ Adding fluid
Make sure to check the fluid type and prepare the necessary item.
Fluid type
Items
486
FMVSS No.116 DOT 3 or SAE J1703
Clean funnel
The brake fluid level should be
between the "MAX" and "MIN"
lines on the tank.