K1200GT 2008 // Brake lever squishy and pads drag after replacing pads - BMW Luxury Touring Community
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post #1 of 4 Old Oct 21st, 2017, 5:36 am Thread Starter
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K1200GT 2008 // Brake lever squishy and pads drag after replacing pads

Good day,

After replacing my front brake pads the lever is squishy, and the pads are dragging slightly.

The brakes / ABS still work quite well, but I can pull the lever all the way into the handlebar. Also, when the lever is pulled, a hissing noise is audible. Seems to be coming from the Pressure Modulator (the non-whirring type).

I've bled both calipers using a Mightyvac. No difference.

The lever, though, I can live with for now. But the dragging pads not so much. Even though there is only a slight drag, the brakes start whining after a few miles of highway. When checked, the calipers are both about equally hot.

Should the Pressure Modulator be bled? I don't find a procedure for that in the BMW shop manual, and it doesn't seem to have nipples.

Appreciate you help.
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post #2 of 4 Old Oct 21st, 2017, 8:14 pm
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Re: K1200GT 2008 // Brake lever squishy and pads drag after replacing pads

I am not a big fan of vacuum bleeding and prefer the conventional hose and bag while pushing fluid from the master cylinder. Easier to see the bubbles disappear over the vacuum method that sucks air in around the bleed nipple. Never see the bubbles go away.
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post #3 of 4 Old Oct 21st, 2017, 11:02 pm
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Re: K1200GT 2008 // Brake lever squishy and pads drag after replacing pads

It is important to clean the sides of the caliper pucks with a compatible fluid like 100% isopropal alcohol before you push them back for the new pucks. Be sure they are dry before pushing them in. I suggest as above a fresh bleed job using the old fashion squeeze, open/close method. If you have a GS911 activate the ABS in the brake flush program and bleed again. You have air in the system.
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post #4 of 4 Old Oct 22nd, 2017, 9:18 am Thread Starter
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Re: K1200GT 2008 // Brake lever squishy and pads drag after replacing pads

Thanks guys,


I've done the following:

- GS911 ABS bleed;

- Removed calipers and thoroughly cleaned the pistons which are in good condition;

- Bled the calipers the old fashioned way, which didn't seem to have any air in them;

- Bled the hand brake cylinder, which didn't seem to have any air either;

- Bled the control module, no air;

- Bled the point where the hose from the hand brake cylinder attaches to the pipe of the control module, no air.


Unfortunately the situation is still the same: the lever can be made to touch the handle, the wheel doesn't rotate freely, and there is a hissing or puffing noise audible from where the control module is.

I've used Brembo aftermarket brake pads, which appear to be fitting perfectly.

Here is a video which demonstrates the puffing noise: https://we.tl/BCy1Xx5pIL

Any idea?
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Last edited by Elwin; Oct 22nd, 2017 at 10:19 am.
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