There are two types of wheel alignment: two-wheel and four-wheel alignment. Two-wheel alignment involves aligning the front wheels only and was the predominant alignment method used before the introduction of today’s more sophisticated steering and suspension systems. Two-wheel alignment is satisfactory for older model vehicles and with solid rear axle.
Pedders recommends that all ‘recent’ model vehicles, i.e. those without a solid rear axle, require a four-wheel alignment. This involves aligning all four wheels together. Particularly for the front-wheel drive vehicles and those with independent rear suspension, failure to align all four wheels can compromise safety and handling qualities.