Patent ID: 8108117

Claim:
A method for measuring and estimating a brake factor in a vehicle brake system, the vehicle comprising a towing vehicle and a trailer having a plurality of wheel axles, comprising: initiating a controlled braking manoeuvre involving at least a first wheel axle and a second wheel axle; and obtaining values representing the brake factor for the first wheel axle and the second wheel axle by means of a control unit which is provided with a brake adaptation function to obtain a brake balance between the towing vehicle and the trailer; braking, in a forced manner, the first wheel axle when retardation of the vehicle is requested; estimating the brake factor for the first wheel axle by determining the brake pressure and braking torque for the first wheel axle; providing a transition phase after which the second wheel axle is braked, in a forced manner; and estimating the brake factor for the second wheel axle by determining the brake pressure and braking torque for the second wheel axle.