A stringent Road Test procedure is required for modified vehicles with changed wheels and tyres, modified suspension such as coil-overs, brake modifications, engine changes or any other modifications which may affect the on-road performance.
Part of the road test is the cyclic brake test, which requires the Certifier to perform three or five hard stops from 100kph to zero within two minutes, on a typical, uneven road surface.
Problems which can occur during the Brake Test are
1 Brake Fade, where the brakes or brake linings are inadequate for the performance or the weight of the vehicle,
2 Brake imbalance, where front and rear brakes are not matched, and wheel lockup is happening before optimum braking is achieved,
3 Wheel bounce and chatter, where the suspension is unable to keep the tyres in contact with the road surface to achieve good braking,
4 Dangerous effects on the steering, where the vehicle becomes unstable, or is hard to keep on course during braking.
5 Malfunction of ABS, EBD, Brake assist, and Stabililty Control systems.
The car being tested here is a 1988 Nissan Silvia, fitted with a SR20DET motor with drivetrain, front intercooler, S14 brakes and 5 stud hubs, adjustable platform struts, adjustable caster bars (front) Adjustable camber arms and adjustable toe arms (rear) and competition seats. It has been set up as a drift car, but it is an excellent handling car for road use.
