Dynamometer testing

DYNAMOMETER TESTING

General

IMPORTANT: Use a four wheel dynamometer for brake testing if possible.

WARNING: Do not attempt to test an ABS function on a dynamometer.

Four wheel dynamometers

Provided that front and rear rollers are rotating at identical speeds and that normal workshop safety standards are applied, there is no speed restriction during testing except any that may apply to the tyres.

Before testing a vehicle with anti-lock brakes on a four wheel dynamometer, disconnect the ABS modulator. The ABS function will not work, the ABS warning light will illuminate. Normal braking will be available.

Two wheel dynamometers

ABS will not function on a two wheel dynamometer. The ABS light will illuminate during testing. Normal braking will be available.

If brake testing on a two wheel dynamometer is necessary, the following precautions should be taken:

• Traction control must be disabled
• Neutral selected in gearbox

When checking brakes, run engine at idle speed to maintain servo-vacuum.