Brakes and Traction Control: Testing and Inspection

General

Checking the brakes on a rolling road test stand cannot equate 100% to a braking sequence performed on the road.

Due to the relatively high weight differences between the front and rear axles it is normal for the front axle to achieve higher test values. Vehicles with a low rear axle loading achieve low braking forces at the rear axle.

Additionally, the influence of weight change, friction, and road surface conditions encountered when braking while driving cannot be reproduced on a rolling road test stand.

The following table shows the minimum braking force at the rear axle dependent on the actual axle loading when the vehicle is stationary.

The braking forces displayed in the following table comply with 29 StVZO (German road traffic act).

In the table, the lower limits that must be achieved are shown. A properly functioning brake system will always achieve or exceed these values.

Test Values For Minimum Braking Force At Rear Axle