# Regulation (EC) No 1222/2009 of the European Parliament and of the Council of 25 November 2009 on the labelling of tyres with respect to fuel efficiency and other essential parameters (Text with EEA relevance), Division 4.2.8.1: Calculation of the peak braking force coefficient

Extent: E+W+S+N.I.

The tyre peak braking force coefficient ( μ peak ) is the highest value of μ(t) before lockup occurs calculated as follows for each test run. Analogue signals should be filtered to remove noise. Digitally recorded signals must be filtered using a moving average technique.
μ(t) = fh(t) fv(t)
where:
μ(t) is the dynamic tyre braking force coefficient in real time;
fh(t) is the dynamic braking force in real time, in N;
fv(t) is the dynamic vertical load in real time, in N.

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Source: https://www.legislation.gov.uk/eur/2009/1222/annex/V/division/4/division/4.2/division/4.2.8/division/4.2.8.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-1222/annex-V/division-4/division-4.2/division-4.2.8/division-4.2.8.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.