The friction brake alone is sufficient to hold a fully loaded SLRV (with 219 passengers) on a 9° slope. In addition, six electromagnetic track brakes are provided; on the Muni cars, the track brakes are controlled independently to hold the car in place when starting on a slope, and on the MBTA cars, the track brakes are blended into the main brakes.
The friction brake alone is capable of holding a fully loaded SLRV (with 219 passengers) at a 9° incline.  Six electromagnetic track brakes are also included for additional stopping power. On Muni vehicles, these track brakes operate independently to hold the car in place when starting on a slope. On MBTA cars, they are integrated into the main braking system.