Popped a piston out of the caliper... - 600RR.net
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post #1 of 7 (permalink) Old 09-08-2008, 01:25 PM Thread Starter
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Popped a piston out of the caliper...

Yep, I made a newb mistake last night. I was cleaning the pistons on my brake caliper and I pulled the brake just a little too much and popped one of the pistons out. :(

So now what should I do? I was under the impression that I can't just put it back in. any help would be appreciated :) thanks!
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post #2 of 7 (permalink) Old 09-08-2008, 03:56 PM
 
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clean it - using brake fluid.
Check the rubber seals, then 'CAREFULLY' reinsert it.
I find that if the piston is smeared 'generously' with brake fluid it goes in easier..
Then refill & re-bleed.
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post #3 of 7 (permalink) Old 09-09-2008, 01:10 PM Thread Starter
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Well I tried that and it doesn't seem to build any brake pressure. When I bleed that caliper it does not seem to be bleeding right. When I pull the brake lever, fluid comes out but then when I release the lever the fluid goes back up my bleeding tube. Is that normal?
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post #4 of 7 (permalink) Old 09-09-2008, 02:28 PM
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That is supposed to happen (when you're doing it wrong). When you bleed the brakes, Open the valve on the caliper then squeeze the brake lever. Close the valve on the caliper before you release the lever. Out with the air at the bottom, in with the fluid at the top.

Once you get all the air out using the valve on the caliper, I have a trick that finishes the job. If there is air in the line sometimes it won't make it to the caliper because it keeps floating upward while you're trying to make it go down to the caliper.

put the brake pads in so you don't lose you piston again. Then I pump the brake until the pads touch and pressure will then build in the line. Wait a few minutes and maybe tap on the brake line to get the air to move back up the line to the master cylinder. Then pry your pads apart and any air that is in the line by the master cyl. will bubble out. Do this with the cap off the master cyl. If no air, Then you're done. Usually one time will do the job but if you want to make sure, do it twice.

I hope this helps

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Last edited by dcope17; 09-09-2008 at 02:31 PM.
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post #5 of 7 (permalink) Old 09-12-2008, 09:08 PM
 
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i did the same thing once
cost me some paint on my track plastics
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post #6 of 7 (permalink) Old 09-13-2008, 12:23 PM Thread Starter
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Thumbs up

Lol that sucks, I bet you were pissed!

Luckily it popped out while I had the caliper in my hand while cleaning the pistons. So it just went all over my leg instead of my paint :)

Thanks for the help guys. Cleaning it with brake fluid and sliding it back in seemed to work fine.
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post #7 of 7 (permalink) Old 09-13-2008, 01:07 PM
 
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thats good to know - you just have to love brake fluid !
I manage to tip every can I ever use of it over my garage floor.. then stand in it !
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