I've experienced and read about the pulsing front brakes on the "S" model.
I've read Don E.'s threads on all he did to resolve the problem.
I've gone down the same path as Don - replaced the front wheel bearings, installed EBC floating rotors & EBC HH brake pads - the dang front brakes still pulse & shutter when trying to use the front brake by itself while coming to a stop. The use of both brakes diminishes the problem.
I do have a reference point but to make a change will be expensive . . . my R65LS had a brake rotor conversion from Spiegler Performance - I learned about this when interviewing the owner and writing a brake story for MOA. The front brakes on the R65LS are also dual and work so smoothly I could sing about it! The other thing - the EBC rotors will start to build up rust on the surface, even in the garage - when I rode it out to CA and left it covered for a couple weeks, corrosion had formed and I used 0000 steel wool to remove it - the Spiegler rotors don't do that.
Realize the front fork engineering/ geometry is different between the R65LS and K75s
Aside from this issue, I like the bike so much, I want to solve this problem - the next step is to have Spiegler convert my original rotors - the only problem is . . . I tossed the old rotors in the trash can after installing the EBC's - I did feel some improvement at first.
I've spoken with other K75s owners - one guy I met at a rally this weekend said his used to do it but not anymore - and he's using the stock OEM BMW rotors.
The input I'm seeking from you is: am I chasing a dream here or is the pulsing here to stay? My axle is straight and the steering head bearings don't bind in any way. I believe my front wheel is balanced, as I've ridden over 90 without any signs of out of balance.
If consensus says give the Spiegler rotors a try, I'll need to purchase a set of used K75 rotors, as they need the hubs to do the conversion - would a set like these work?
Want to figure this out.