Introduction (Discovery 3)

A road test or roller test is performed for various reasons. The following is a detailed description of the preliminary checks by starting and stopping the engine, the checks before the road test, the checks during the test, and the checks performed after the road test.

It is not necessary to perform a full road test until all vehicle systems have been checked. Instead, only those components that are directly related to the system(s) being tested can be isolated.

Preliminary checks

CAUTION: If the brake fluid level is low, the brake pedal travel is excessive, or a leak is detected in the hydraulic system, do not road test the vehicle until the cause of the problem has been determined and corrected.

Before a roller test or road test, it is always recommended to perform preliminary and functional checks on systems and electrical circuits that affect the safe and proper operation of the vehicle. (for example, the braking system, the lighting system and the steering system).

• Engine oil level
• Coolant level
• Tire pressure, tire type and tread pattern compatibility and wear status.
• There is enough fuel in the tank to carry out the test.
• Check all areas around the engine, transmission, and underneath the vehicle for oil, coolant, brake fluid, and fuel leaks. Mark any visible leaks and wipe down adjacent areas so that the extent of the leak can be determined upon completion of the test.