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Using the procedure described in paragraph 4.1. of this Annex, perform two braking tests of the reference tyre, each consisting of at least six (6) valid test runs in the same direction on aligned segments of the track. The braking tests shall cover the entire potential braking area, including where the texture depth was measured.
Evaluate the braking tests as described in paragraphs 4.1.6.1. and 4.1.6.2. of this Annex. If the coefficient of variation of one braking test CVBFC exceeds 4 per cent, dismiss the results and repeat the braking tests.
For each braking test, the arithmetic mean .png) of the average Braking Force Coefficients shall be corrected for effects of temperature as follows:
.png)
where
ϑ is the wetted surface temperature in degrees Celsius,
ð= 0.002 â −1 and ϑ0=20 â.
For each braking test, the temperature-corrected average Braking Force Coefficient (BFCave,corr) shall be not less than 0.57 and not greater than 0.79.
The arithmetic means of the temperature-corrected average Braking Force Coefficients of the two braking tests shall not differ by more than 10 per cent of the average of the two values:
.png)
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