Lexus 2012 RX450h Owner's Manual page 760

4-3. Do-it-yourself maintenance
Brake fluid
■ Checking fluid level
RX350
RX450h
■ Adding fluid
Make sure to check the fluid type and prepare the necessary item.
Fluid type
Items
760
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.
The brake fluid level should be
between the "MAX" and "MIN"
lines on the tank.