David Tompkins ran in practice today at New Jersey Motorsports and this was the first test of the .61 coefficient of friction brake lining and I also supplied him with two new 7" rear brake shoes with the same lining (he has only one rear brake.)
Just to set the stage, he had initially run the race lining supplied with the 8" brake that Mike Hawthorne is running. He found the squealing to be so annoying it was unsettling. He changed the lining to one used by Patrick Godet which turned out to be much better stopping with no squealing. The linings and shoes I supplied him with, which he tested today, performed the best of all according to Dave. He did race there last year and he took 7 seconds off his lap time during the practice.
We have some more testing to do, but I think this is good news for improving the Vincent brakes. I do have higher friction linings that I can try (and I probably will), but this lining performs quite well cold (.61) and they go up to .63 at 600 degrees F. That type of performance is difficult to find in any lining and I suspect that going higher in friction will require more heat in the brakes, which would not be good for street use.
View attachment 22882
A shot of the rear shoes before arcing and chamfering. The standard Vincent geometry was used for placement of the lining.
David