I found this interesting read !! Also, Tables 1 and 2 about brake friction reduction. Montreal Runway Excursion, Royal Air Maroc, Boeing 747
.....The test report for November 1999 indicates that the surface of runway 06L/24R had a
poor texture and low friction starting about 3 300 feet east of the threshold of runway 06L, near the intersection of taxiway B2, and worsening in the touchdown area between 1 300 and 2 600 feet from the threshold of runway 24R. The test results for May 2000 exceeded the standard prescribed in TP312; the report notes, however, that these tests were conducted after a period of cold and rainy weather, which made for optimum runway surface conditions. According to the report, the average coefficient for the full runway and the coefficient for any 100-metre section degrade as summer approaches. The test results for 16 June 2000 and 21 July 2000 indicate
friction coefficients requiring that remedial maintenance action be planned. The 21 July 2000 test results for the other two runways indicated average friction coefficients of 74 for runway 06R/24L and 82 for runway 10/28. These coefficients are 30 per cent and 43 per cent higher, respectively, than for runway 06L/24R......
http://www.tsb.gc.ca/en/reports/air/...4/a00q0094.asp