Originally Posted by milkman
You guys still had residual braking, right?
Probably, but not at the precise instant the modulator was in control and removing braking.
If you think about what ABS (mine is simple 11) is doing, in response to loss of traction during braking, the system will assume a locked wheel (i.e no friction =skid=no braking anyway) so the hydro unit will relax braking effort and then re-apply it 'some time' later in a repeated cycle until both wheels are back in speed sychronism. The ABS may not know the difference between a few feet of bumps at 30mph with short skiddies and several hundred feet at 70mph. Its only information is your wheel speed and whether a wheel is locked or not compared to the other wheel. It doesn't matter what you do with the foot or hand brake, if both are hard on, the ABS will relieve the brakes and re-apply them according to its design algorithm. I don't know whether the system comes off quickly as soon as a wheel becomes unlocked, my impression on the few times I tried it was it modulates for a time afterwards - although when you're trying to keep the bike stable, you don't have much time for data and feedback analysis!
The first time I tested my ABS on a wet surface for a rear skid I found I could quickly release the brake then re-apply it less hard and stop the ABS coming on. In fact I was then using adequate braking and actually stopping a wheel lockup. Whether I can do this and stop sooner than holding the brake and letting the ABS do it is questionable and relies on rider skill not required when ABS is in control. Nobody has shown in circumstances when they had no brakes, there was sufficient friction to the road to have some brakes. Once a wheel loses grip, stability may take longer to get back than we think.
I was suggesting the system may not be clever enough to recognise short bumps and dips at slower speeds needing less 'off time' and possibly a faster modulation rate. Since the control is electro hydraulic the modulation rate may be relatively slow compared to tens of milliseconds needed for bumps and weaves. Most of the general times when ABS comes on you are riding too fast trying to stop too quick for the road surface conditions. If they fit an ABS off switch on the GS and the systems are basically the same, I think I'd assume the weakness will be low speed short duration skids/bumpy roads/gravel where you may get momentary loss of traction and the ABS kicks in with an algorithm designed for higher speed street braking on wet surfaces.
For most riders ABS has saved their ass when they probably needed it. Personally I feel if you ride to the limit where ABS is frequently active, then I'd look at joining a rider training course and learn how to use motorcycle brakes. Linked brakes you'll love or hate. If you try hard I'm sure there'll be some braking scenario which breaks the design algorithm.
I had one of the first performance diesel saloons. I always cadence brake similar to what the ABS modulator does - that was taught in all the schools. When I did this from 70mph for an emergency stop I was left with virtually no brakes and still moving. Why? because diesels use an engine driven vac. pump which (unlike carb manifolds) drops output during decel. Now with more diesels and ABS the schools recommend foot down for emergency braking.
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