Originally Posted by Farway
Just bought my first Bm and went for a K1200RS 1998 model.
Must admit, the bike is growing on me day to day but have a few issues. At 6'4 , i find the bike a bit cramped. will be ordering the pegs lowering kit from pirates today an probably look to lift the seat an aditional inch or so. My big gripe is front rotors... mine have circularplay in thrm which indicates either the bobins have worn or the disc slots have opened up. also at very low gentle stopping speeds the bike discs seem to have a varience in thickness as you can feel uneven stopping. I have also been told the rotors on these are a bit of a design issue. The bike has 55k miles on but rotors are not masively scored or worn yet. Do i ignore this issue and keep riding it?? Any advice appreciated.
There are many things on Beemers that are done differently to other bikes. Don't make the mistake of doing what comes naturally or what you think is best - it could be wrong and cost you a lot some time ahead. Go and buy the Clymer workshop manual off Amazon and read the posts on this site. All the information you will ever need is here, you just have to put some effort in yourself and search for it.
The front rotors are designed to float in order to take up any slight out of true when the pads close. The holes in the rotors are supposed to be oval! However, this ability to float has a downside and that is a tendency for the rotor to 'rattle' or it may give a clunk when the pads grip. To reduce this problem BMW fit wave washers we call crinkle washers under the bobbins. They are supposed to have sufficient tension that if you grip a rotor and try and move it there should be tension and not hard rattle.
It is a very common problem for these simple and cheap washers to lose their wave/crinkle when they no longer give tension. The solution is to take each one off and replace them, or using a fine pair of needle pliers, reshape them. I have reshaped mine quite a few times, until I had a convenient visit to the Stealer and bought some new spares.
Now you just may have warped or out of true rotors some have found, mot more likely on an older bike is one or more caliper pistons have seized and that is the uneveness you are getting. On a UK MOT they will fail a bike which puts fluctations on their brake effort meter when they gently apply a brake.
I check all my brake caliper pistons are free every annual service now.
As for Loctite, you don't go around using the stuff willy nilly - it will give you a big headache later on. If the spec' says use it then use it. Those wheel bobbins from memory are only M5 or M6. If you have to free up Loctite then use heat. If you shear the stud then it will be a pain repairing the wheel rim thread.
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