Page 110 - Annual Training Class 4_7 classroom 20-21

Calculating brake efficiency

For most vehicles the MOT testing service will calculate brake efficiencies automatically.

If MTS is not working, add the brake efforts from each wheel for the system that is being

tested and carry out the following calculation:

The vehicle test weight will depend on the vehicle test class.

 Classes 3 and 4 use the weight shown by the brake test equipment. Otherwise, take

the weight from a weight data chart or some other reliable source.

 For Class 7 use the DGW from the manufacture’s plate or, the nominal DGW of

2,600kg if using a plate brake tester and the presented weight is less than 2,000kg.