K11 Owners Group

dwerbil · Posted: Sun Feb 28, 2016 2:26 pm Post subject: '93 K1100RS calipers

The front left caliper is a bit sticky, not wanting to release its grip right away. Since there are no leaks from the calipers, can one open them up to clean and use the same seals?
Mileage unknown...salvage title.
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93 K1100RS ~ 2004 R1150RT ~ 84 RS ~ 78 R100/7 ~ 65 R60/2
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Randy at Round Rock, Texas

Jim · Posted: Sun Feb 28, 2016 4:09 pm Post subject:

I wouldn't consider re using anything that's 23 years old...

New brake fluid? Brake lines replaced?
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Grunter · Posted: Sun Feb 28, 2016 5:01 pm Post subject: Callipers

You may find it useful if you remove the offending calliper but leave the brake line still attached. Remove pads.

Place a piece of wood (or metal) between the pistons thick enough to mimic the disc and worn out pads and gently pump them out but not so far as to pop the pistons out of the cylinders. Now detach the calliper from the blake line

Release the bleed screw and attach a piece of tube to the end. Clean the edges of the pistons and dust seals with brake cleaner and something like an old toothbrush rinse the crud off with brake cleaner again, dry off and coat them with brake fluid and press the pistons back into the cylinders.

Now refit the calliper and pads. Repeat for the other side. Bleed the brakes as normal. There is more than a chance that all that is causing the brake to be a bit sticky is simply a bit of dirt.

It is well reported that it is not good practise to split the 4 piston callipers as fitted to K1100 bikes because of the difficulty of getting a perfect seal
after they are split apart.
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1997 K1100LT
1994 R1100RS

Flying Duck · Posted: Mon Feb 29, 2016 7:57 am Post subject:

It could just be crap in a brake line. Give the whole system a good flush with new fluid.
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dwerbil · Posted: Mon Feb 29, 2016 8:14 pm Post subject:

Thanks for the replies. The front and back brakes were just flushed with new fluid about 400 miles ago. Have some new front disc pads due in next week. Will try Grunter's advice then follow with a good flush again.
_________________

93 K1100RS ~ 2004 R1150RT ~ 84 RS ~ 78 R100/7 ~ 65 R60/2
Click for pics
Randy at Round Rock, Texas

Jim · Posted: Mon Feb 29, 2016 10:29 pm Post subject:

If those are the original brake lines, you might want to think about replacing them.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Flying Duck · Posted: Tue Mar 01, 2016 7:29 pm Post subject:

Grunter · Posted: Thu Mar 03, 2016 7:32 pm Post subject: Brake lines

Flying Duck · Posted: Thu Mar 03, 2016 9:08 pm Post subject: Re: Brake lines

Jim · Posted: Fri Mar 04, 2016 2:12 am Post subject:

At least one rider on the forum has had the brake line turn into a one way valve as the brake line deteriorated inside. It would allow fluid to move toward the caliper, but not back to the master cylinder - causing the caliper to hang up.

At 23 years of age, most of the rubber bits on a bike will be deteriorating - including the brake lines.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

Grunter · Posted: Fri Mar 04, 2016 5:19 am Post subject: Brake parts

Let us hope that it is only the brake lines are the real problem. I have just checked the original parts list and new seals and dust covers are listed as being supplied to BMW Dealers only! Non genuine parts may be available but I would not like to use them

I have also checked several independant BMW parts suppliers and they do not list them. Parts are available for the rear twin piston calliper but not the front.
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1997 K1100LT
1994 R1100RS

Scott_Anderson · Posted: Fri Mar 04, 2016 7:56 am Post subject:

You can get Breembo caliper kits and Magura master cylinder kits from Motobins. I just got some back in June.

Apparently the "sales restriction" must only apply to U.S. sales.
Some dealers may sell the parts, but only if they do the install......
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1997 K1100LT 0302488(R.I.P.)
1997 R1100RT ZC62149(sold)