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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Harrpics on March 21, 2025, 09:18:03 AM
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Hi all, Hoping for answers! Have rebuilt front calipers and master cylinder on 94 K1100 w/o ABS. New brake lines, too. With reservoir cover removed, I bled the brakes and have a good lever feel. On the bench, the wheel spins freely and the brakes work properly. When I put the bellows and cover on the reservoir and apply the brake, the pistons will not release and the wheel, obviously, is difficult to spin. Thoughts? I've read there's a vent hole but also read there is no vent. Really puzzled. Thanks!
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I've read there's a vent hole but also read there is no vent.
There are two holes in the floor of a Brick's front master cylinder reservoir, regardless of what you have read. One of the holes is much smaller than the other. Empty fluid completely from the reservoir, wipe the reservoir with a clean, lint-free cloth and observe. The smallest could be clogged; a fine wire will be needed to clean it. Attached is a photo of a 2V front master cylinder reservoir showing the difference in diameters. Your 4V master cylinder will have a similar difference.
(https://www.motobrick.com/gallery/2/1601-240619012226.jpeg)
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Thank you so much. Will empty the reservoir and take a look tonight.