Volvo S70 Owner's Manual page 186

1999 S70 & V70
pg. 120 Servicing
Rolling road (spin) test (models with AWD and viscous coupling)
When checking brakes using a rolling road (spin) test, or when balancing the wheels directly on the car,
the other wheels must be free to roll, see illustration. This ensures that the viscous coupling is not
damaged. The drive power is transferred automatically by the viscous coupling to the car's other drive
wheels. If you are unsure, consult your nearest Volvo retailer.
Hoisting the car
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