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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 01-25-2010, 09:14 PM   #1 (permalink)
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front brake caliper piston

Wondering why i still have mushy brakes, i took a closer look at the caliper. I saw one of the pistons is sticking. Does this mean a rebuild?
The book calls for blowing compressed air into the banjo fitting...to push out the pistons. So doesn't seem all that hard.

Anything i can do before i start calling around looking for a rebuild kit?

Thanks
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Old 01-25-2010, 09:29 PM   #2 (permalink)
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Blowing air through the line will get the piston to move, but may not necessarily remedy the problem. I had a rear piston sticking on my trophy, and the cause was a little corrosion that was pushing on the seal, making it stick.

I disassembled the caliper, and pulled the pistons out then removed the two seals from each cylinder and cleaned out the groves that the seals sit in. I also buffed the piston in question with emery cloth to remove some of the corrosion.

Before reassembly, I coated everything with SilGlide (a silicone compound from NAPA). Everything workd fine after that. At my next fluid change, I replaced the seals along with the pads. Actually, it does not take that long.

If you are going to remove a banjo bolt, make sure you have new copper washers to replace the old ones. I can go back and look, but I do not think the seals were too awfully expensive.
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Old 01-26-2010, 10:48 AM   #3 (permalink)
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I would definitly pull the caliper apart and clean/inspect to be sure. The hardest thing to do is bleed it which you would have to do after blowing air in anyway.
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Old 01-26-2010, 11:59 AM   #4 (permalink)
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One of the pistons is scratched too...so, emery cloth to clean it up?
And thanks for all the info
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Old 01-26-2010, 12:46 PM   #5 (permalink)
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Quote:
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One of the pistons is scratched too...so, emery cloth to clean it up?
If you must then use the finest grades, 180 or 200 or even finer such as "flour" grades.
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Old 01-26-2010, 07:55 PM   #6 (permalink)
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Yes. If I remember correctly, the pistons look yellowish, like they are nitride coated. I had some corrosion on mine, so I ran them on a soft wire wheel fairly quickly to clean them up. Then I went over them with the really fine emery cloth to clean them up further. When you lube them up and get them back into the cylinders, they will be snug, but will still move fairly readily. Getting them past the (lubed) seals is the most difficult part.

What happens often is that as your pads wear, the pistons stick out further and further. They get covered in road grime, and eventually corrode a little, which often causes the sticking.

It is a pretty good idea to pull your calipers once a year (especially if you put on the miles), and give them a good scrubbing. Change your fluid at the same time ... it is cheap.
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Old 01-26-2010, 08:40 PM   #7 (permalink)
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EDIT:

After i pulled the pistons, one of them was pretty scratched up. Wiped it down with emery cloth...but i can still feel the scratches. They feel deep. Anyways, everything looked ok...but everything back together. I have the same issue...only one piston is moving. So planning on replacing both pistons, seals, and master cylinder piston/seal...you know for good measure.

Last edited by killian101; 01-26-2010 at 11:14 PM.
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Old 01-27-2010, 04:26 AM   #8 (permalink)
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If you do need to get replacement pistons, you can buy stainless steel aftermarket parts, probably cheaper than OEM.
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Old 01-27-2010, 07:34 PM   #9 (permalink)
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OR You could upgrade your caliper to a four or even a six pot one. billet 6 , beringer, both come with stainless pistons as standard?
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Old 01-27-2010, 09:13 PM   #10 (permalink)
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OR You could upgrade your caliper to a four or even a six pot one. billet 6 , beringer, both come with stainless pistons as standard?
going the cheep route first...if all else fails, yeah...may have too
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