\[\eta_{\text {Brake }}=\frac{\text { Brake Power }}{\text { Energy in fuel per second }}=\frac{b_{p}}{m_{f} \times C_{v}}\]
\[\eta_{\text {Brake }}=\frac{\text { Brake Power }}{\text { Energy in fuel per second }}=\frac{b_{p}}{m_{f} \times C_{v}}\]