Tesla MODEL X Owner's Manual page 261

Troubleshooting Alerts
Continue to press the brake pedal as you normally
would, and do not "pump" (repeatedly press and
release) the pedal as this will interrupt the function.
This alert will clear when your vehicle comes to a stop or
you are no longer pressing the brake pedal. It may still
be displayed for up to 5 seconds afterward.
When this assist function activates, you may feel the
brake pedal pull away from your foot and notice a strong
increase in brake pressure. You may also hear a pumping
sound coming from the brake hydraulic unit at the front
of the vehicle. This will usually last for a few seconds,
depending on road surface and vehicle speed. This is
completely normal and does not indicate any issue with
your vehicle.
Reduced braking performance is usually temporary, and
can occur for a number of reasons including high brake
temperatures after heavy brake use, or driving in
extremely cold or wet conditions. It can also indicate
that your brake pads or rotors have worn to the point
that normal replacement is needed.
If you continue to experience reduced braking
performance which does not improve over time, please
contact Tesla service at your convenience for a brake
inspection.
For more information, see Hydraulic Fade Compensation
on page 65.
(GTW_w405)
Electrical system power reduced
Vehicle may shut down
unexpectedly
The electrical system cannot maintain the voltage
required to support all vehicle features.
If this alert is present while you are driving, it is possible
your vehicle will shut down unexpectedly.
It is also possible that your vehicle will not restart after
the current drive.
It is recommended that you eliminate or reduce your use
of any non-essential features. This can help your vehicle
maintain adequate electrical power for essential
functions. It may also prevent your vehicle from shutting
down before you reach your immediate destination,
although this is not guaranteed.
If this alert remains active, schedule service immediately.
Without service, your vehicle may shut down
unexpectedly or may not restart.
Consumer Information 259