Triumphrat

martz

I have a 06 955i with 7500 miles. I started getting a pulsation from the front brakes about 500 miles ago. I have not done any track time, all street riding. I have used my front brakes very little mainly using the back brakes. Is this common with the 955i? I have no idea what could have caused this. Any insight on this would be great. Anybody else had this problem?

sagaris

I just had a similar problem. I'd get some chatter and vibration through the bars using the front brakes. A new set of front brake pads and some copper paste (between the pad and the piston) solved the issue. I'd check pad wear first and make sure the pads aren't binding inside the calipers.

Reaper

Have heard this many times on the Tona,,,one guy even changed rotars to still have the same effect, Replace all brake fluids, drop a new set of pads in and run them in correctly, and if your like most, you will still have the same issue,,,,,,lol,, sorry,, just seems to be on some bikes..

WarpedRotorQuincy

Oh dear, I hope you're not right about that. I wonder if the wheel hub mating surfaces are slightly non-planer on some wheels. I just bought a sub 3k mile 2002 tona in perfect shape for a great price. When I rode it for the first time, I couldn't believe that the owner rode it with such a bad pulse in the front wheel with brakes applied. (Well I guess he didn't ride it, judging by the mileage.) Three weeks and six hundred miles later, I'm putting up with it while commuting and looking on ebay for something less than high $200's. Kneedragger says they sell the EBC Contour rotor for 125 each, but list the years as 199something to 2002 and show the 6 hole rotor. Why won't I pick up the phone? It's those gold EBC rotor hubs.
I've checked to see that all my rivet/buttons move freely, and it's apparent the last owner applied lube to each. Wait, contaminated disc surface? Shouldn't this have smoothed out by now? Will investigate....lab coat, UV light, magnifying glass....
I've put a straight edge from my Starrett combination square on the swept surfaces of the rotors at multiple places looking for an obvious out of round condition. I don't have a front stand yet to read runout the right way. There's no smoking gun warp, but the straight edge rocks about the center ever so slightly as if the rotor face is slightly conical. Screw this, I'm gonna do this in the daytime when it's not thirty degrees.

RexxyPup

This is fairly common on the ST, so I would try this first.

Your discs are supposed to float in the silver bobbins between forks on the rotor, and the black carrier. These frequently gum up and stop this happening which leads to pulsing, and eventually warped discs.

find something you can wedge in the bobbin hole tight enough to rotate them, now squirt some brake cleaner in the bobbin where the two sets of forks go in and rotate the bobbin. Do this for all of them and see if it has cleared the problem

Rexx

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