6.1K views · 44 reactions | Learn how to properly perform speedometer tests and brake tests on rollers for accurate results. Find out why these tests cannot be done if the front and rear wheels are linked, and discover a step-by-step process for disengaging 4WD on a vehicle equipped with viscous coupling type IVWD with ABS. #SpeedometerTests #BrakeTests #RollerTests #4WDDisengagement #ViscousCoupling #ABS #VehicleMaintenance #AutomotiveTips #TestProcedures #4WD | Mechanic Jerome | Facebook

Beautiful morning to check some brakes. The Performance Based Brake Tester measures each axles coefficient of friction to ensure proper brake performance. An overall score is generated for a pass. An individual axle fail will warrant further inspection such as a pad not contacting the drum. | South Dakota Highway Patrol