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I had the caliper and master cylinder cleaned out with new fluid. the symptom is the rear brake acts like I am riding the brake pedal. I looked in the master cylinder and see the two holes, the big one is clean. Is the other a hole the goes through the cylinder walll too? I poked at this hole with a mini drillbit, but not sure what to expect.
 

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mine was sticking as well after it had been sitting since 89. i banged in it with a rubber hammer and it released!
 

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On my '81 1100, twice a year, my rear brake feels like that...


On the pivot point, blow out with air & use a lite oil, 'specially the big spring...

Work it up & down with hand several times...
 

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Cody in MN wrote:
On my '81 1100, twice a year, my rear brake feels like that...

The spring & pivot point, I blow it out real good, lube it with WD-40 or light oil, then use my hand to work it up & down...Took awhile to figure out that's what it was...
Don't use WD40 to lube it, you would be better off using some grease. WD tends to dry up after a while it is really a water dispersant, oh I have seen the adds too but that is just a gimmick to promote the idea that it is the ideal lubricant for every thing. WD40 was changed some years ago, it's not the same as the old stuff.
 

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WD40 absorbs moisture. If you want something to rust really nice and even just spray it with WD40 and put it in a damp place.
nftgwheaty, I doubt the mini drill bit was small enough to open the tiny little hole, a small sewing needle or bristle of a wire brush is what you need. If that doesn't do it it is either the pedal sticking or the caliper. A simple test is when it sticks, loosen the bleeder screw. If it releases it's not the caliper.
 

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I had the same issue after rebuilding the rear caliper and putting in new fluid. I tore into the caliper again when the brake was still dragging. My next step to cure the dragging brake was to rebuild the rear master cylinder. Fortunately, one day the rear brake just started working like it should. I guess the something just worked its way out.
 
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