Matty,
It turns out that it is more likely that your Girdraulics do not dip during braking because the fork seizes as you squeeze the brake lever. The new JE steering stem will allow the fork to dip because the new axle path does not cause the fork to seize. This is the same problem that occurs during the brake test video that causes the tire to squeal. As the brake is applied the fork seizes and eventually causes the tire to slip, which causes the squeal. Squealing tires generally indicate a reduction in tire grip or poor traction, not superior traction.
Many modern riders prefer the dip as they learned to ride with telescopic forks.
I suppose the tire in the video is underinflated to give a large contact patch. The manufacturer determines the pressure at which the tire is called "flat." The manufactures of large truck tires tend to choose 10% as the number. A tire with a recommended pressure of 100 lbs. is considered flat at 90 lbs. and will not be warrantied.
I still think it is a good thing to know what brake lining material you are using. Because Safetek is one of the largest sellers of ScanPac linings, I would guess you are using GGW (assuming the linings are green). I also think that these would work on steel or cast because the linings use aluminum oxide, which works well on both materials.
David
The tire squeal in the video is from the rear tire. I've learned to not pull quite so hard on the front brake as to lock the front tire.
It would also be best not to lock the back wheel , but I find that difficult to do in hard braking. As the weight comes off it tends to lock, so the rear just slides along for the last bit.
My wife and I were on this bike on a 70 mph highway some years ago when a pickup truck pulled out from a hidden driveway. We came around a corner and there was the truck rolling across our line of travel. As she pulled onto the road, the driver saw us and did the worst possible thing. She panicked and stopped, completely blocking our lane.
There was oncoming traffic so the only thing to do was apply the brakes hard. We went from 70mph to zero in a very short amount of space. We came to a full stop just a few feet from the door of the pickup truck.
The braking forces were enough that I ended up sitting on top of the fuel tank.
You can ride for years and never really need much braking and then one day events come together such that you need everything working.
On the dive/no dive topic, it's interesting that the latest greatest front forks, the Showa big piston used on Thruxton R, late model GSXR and other bikes with names that end in R, has an anti dive feature built in. It seems to make cornering at speed a lot easier than with the previous generation sportbike front end, that is anything built before 2014. Maybe I should say anything built between 1955 and 2014
Glen