Sabotaged Brake system on bike.

[BaldBaBoon]

Over the course of the past year or so, a lot of " faults " have been appearing on an irregular basis on my and other peoples bikes whenever I/they have used them to travel into work. Normally after I have had to leave them unattended when working away or overnight.

This is a secure and guarded military establishment with a large civilian workforce.

BMWR100GSPD....previous problems.

Two occasions when all the bolts holding the rear wheel on loosened off ( four bolts on this BMW ) and in fact I ended up losing 2 bolts out of the wheel hub when traveling home after a night shift with this.

Previously completed a 18,000km ride around Europe without incident, then first night shift a few days later....the bolts loosened.

Second occasion was after doing a weekend of off-roading, bike gets covered in mud and stays dirty until 3 weeks later when after a night shift I decide to wash bike down on way home....2 wheel nuts missing after I had actually re-torqued the nuts the day before.

Also had the bike checked by a main dealer to see if any mechanical problems...none found.

BMW G650GS

This just happened, I noticed a couple of weeks ago that the oil in my rear remote reservoir had rapidly changed to a dark engine oil colour and the rear master cylinder was sticking.

Finally got around to fixing it after the rear cylinder gave out.

After stripping the reservoir/pipes/master cylinder apart I found a odd substance inside.

1) A very thick residue that looked like axle grease...thick and in solid lumps,and a light tan in colour.

2) What appeared to be shards of very thin brittle plastic or really looked like crystalized sugar in the actual reservoir pot floating around in the oil and further down the remote pipe.

Could this be someone contaminating the oil on my brakes...they are nothing more secure than a plastic lid away from being able to do so?