I went ahead and purchased the brakes to go with my Dynafit Superlight 2.0 bindings despite the fact that I really prefer a leash for backcountry skiing. My thought was that for resort days cruising with my son, I would be able to easily slap on the brake and not have to go on-and-off with the leash.
The brakes came in both at 80g - 5g under their claimed weight - which was nice. The finish quality of the brakes looks great and installing them is a piece of cake. Unfortunately, taking them off requires tools - you need to depress the pins on the sides of the bindings all the way down past the inside face of the frame that attaches the brakes to the bindings - so a couple screwdrivers or allen wrenches or any other device to push the pins in all the way past the brake mounting frame is required. This seems like a bit of an oversight to me - with a nice round chamfer on the ends of the pins you would be able depress them far enough with your fingers to get the brake off without tools - but maybe Dynafit has a reason for making them this way that just isn't apparent to me.
Stepping in to the bindings is basically just as easy (or hard depending on what you think of the Superlight 2.0's step in force) as without the brakes. If you've ever used the Radical ST or FT, the principle to get the brake out of the way in tour mode is the same, just hold the heel pad down the to the ski with your hand and twist the rear portion of the binding so that the pins point toward the back of the ski and the brake is secured up.
The reason I give these brakes 4 stars rather than 5 is that on numerous occasions the brakes have not deployed when I have stepped out of my skis - while I haven't crashed and had a ski just slide away down the mountain, that's what makes me nervous about these brakes.
When you step into the binding the heel pad pivots the brake arms up and then as they come to the top of the upswing, they pinch inward. That inward pinch and the resistance of the steel brake arms running through the pivot hole in the steel frame is what prevents the brakes from deploying properly when I come out of the bindings. I've tried a couple different lubricants (PTFE and a waterproof grease), but haven't noticed a significant difference in how often the brakes end up sticking. Also, the more snow that accumulates under your boot and in the brake, the more likely it seems that the brake will catch. Hopefully this is something that will 'run in' and over time the issue will go away.
And, for what it's worth, for backcountry skiing these brakes have done nothing to change my opinion that a leash is the best choice.
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