Porsche 911 Carrera Owner's Manual page 69

Brake tests
Brake tests must be performed only on plate-type
test stands or roller test stands.
The following limit values must not be exceeded on
roller test stands:
– Testing speed 5 mph (8 km/h)
– Test duration 20 seconds
Handbrake tests
Handbrake tests on the roller test stand must be
performed only with the ignition switched off.
Balancing wheels on the vehicle
During finish balancing of the wheels, the vehicle
must be hoisted and all the wheels able to rotate
freely.
Towing
Please observe the chapter "TOWING" on page
321.
67
Controls, Instruments