Join Date: Mar 2010
Location: Mount Vernon, WA, USA
Re: Question about brake bleeding
The part mentioned in the above post is referred to as a grub screw. Also used on the clutch bleed port on the end of the access hose for the clutch slave cylinder. It has a bit of a change of pace to use. As mentioned there is a ball check valve at the bottom of the BMW fill port that we are talking about. So to use the grub screw the technique is just the opposite of a usual bleeding sequence. Normally you loosen the nipple to bleed a little fluid then close it before sucking air back in when you release your lever. With a grub screw you need to lightly bottom it to let the tip of the grub screw push open the ball check valve and then fluid will flow. Back off the grub screw to seal the check valve before you release the lever. It takes little torque on things to do this, in face you can do it by finger if you like but wear vinyl gloves as brake fluid as other chemicals are not good to get on your skin. I also keep a spritz bottle of water and a drop of dish soap in it to de activate spilled brake fluid and help wipe any mess.
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I change your tires $50, you buy them on the web.
K13S, S1000R (gone through a few GS's & RT's)