Rear caliper not releasing

  • vanlagan
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Re: Rear caliper not releasing-FIXED

29 Aug 2006 14:29
#73255
Thanks All,
It was indeed the tiny little hole that Terry refered to
as the "Spooge" hole. I got a very thin piece of wire and it sure enough wouldn't go through without a little persuassion. I pumped it for about 5 minutes straight (after a good bleeding) and it turns freely.
Thanks again,
Thom

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Re: Rear caliper not releasing-FIXED

29 Aug 2006 14:32
#73256
Thanks All,
It was indeed the tiny little hole that Terry refered to
as the "Spooge" hole. I got a very thin piece of wire and it sure enough wouldn't go through without a little persuassion. I pumped it for about 5 minutes straight (after a good bleeding) and it turns freely.
Thanks again,
Thom

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  • tommyp76
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Re: Rear caliper not releasing-FIXED

23 Sep 2009 13:19
#323521
Bringing an oldie back from the dead...

Where exactly is this hole you guys are referring to? I'm having the same release problem.
1978 KZ650B

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  • Patton
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Re: Rear caliper not releasing-FIXED

23 Sep 2009 14:01 - 23 Sep 2009 14:02
#323528
Inside m/c reservoir at the bottom are two holes, one that's relatively larger and easily visible, and another tiny pin prick size hole.

The larger hole provides fluid from the reservoir into the m/c bore for the piston to push against when activating the brake (squeezing the handlebar brake lever or pressing the foot brake lever) by pressuring the hydraulic fluid through the line into the caliper.

The tiny hole allows the in-line pressure to release when the brake lever is released and no longer being squeezed.

If the tiny hole is clogged, the brake may remain activated or partially activated even after the brake lever is released.

Another cause for the rear brake to heat up and grab is sometimes an insufficient gap (free play) between the adjustable external rod that's pushed by the foot brake lever up into the m/c against the m/c piston. Assure there's plenty of gap in this adjustment when rear brake is cool.

Good Luck! :)
1973 Z1
KZ900 LTD
Last edit: 23 Sep 2009 14:02 by Patton.

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