Test the brake system on a road that meets the following conditions:
| • | Dry |
| • | Clean |
| • | Smooth |
| • | Level |
Do not test the brake system on a road with any of the following conditions:
| • | Wet |
| • | Oily |
| • | Slippery |
| • | Crowned |
| • | Rough |
A wet road may cause hydroplaning.
An oily road may cause slipping.
A slippery road may cause the tires to slide.
A crowned road may cause the tires to grip unequally.
A rough road may cause the tires to bounce.
Test the brake system at different vehicle speeds. Test the brake system with light pedal pressure and with heavy pedal pressure. Locked brakes and skidding tires do not indicate brake efficiency. A vehicle with locked brakes and with skidding tires needs a greater distance to stop than a vehicle with tires at the limit of adhesion. The limit of adhesion is the greatest possible force on a tire before a tire skids.
Because of a higher deceleration capability, the driver may feel a firmer pedal at higher deceleration rates.
