Caliper Reseting - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 11 (permalink) Old 04-18-2007, 07:43 PM Thread Starter
 
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Caliper Reseting

What is the best way to force the pistions back into place if the brake has been squeezed while off the rotor? Best meaning easiest and won't crack my pads.
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post #2 of 11 (permalink) Old 04-18-2007, 08:27 PM
 
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Ah, yes; the old "I didn't put anything between my pads, and my little brother cranked on the brake lever while I was in the bathroom" dilemma.

The answer is....depending on the model, and how much backing plate is showing; I used an old screwdriver, put it in a vise, and heated it up until the tip got cherry red...then put 1/8 in. in the vise and bend it down 90 degrees or so, and quench. This gives you a wide flat surface with with to GENTLY pry the BACKING PLATES apart...work the front and the back of the calipers, taking your time alternating. Some brakes have the retaining clips under a cover on the top of the caliper...once you get the pads a wee bit apart, pop the cover, remove the retainers, and slide the pads out. Now you have much more clearance to push the pistons back in, but, before you do, get some brake cleaner and a couple of Q tips and clean the sides of the pistons off before you go shoving all that road gunk into the bores of your calipers......guaranteed to seize the brake pistons at the most inopportune time.....
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post #3 of 11 (permalink) Old 04-18-2007, 08:56 PM
 
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PS...make sure that when you are done and get it all back together that you REPLACE THE FLUID AND BLEED THE SYSTEM. Moving that amount of fluid back and forth thru the system guarantees you'll get some air/moisture in there, and dislodge muck thats been sitting in line junctions, ect. Do it right.
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post #4 of 11 (permalink) Old 04-18-2007, 09:00 PM Thread Starter
 
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Ah, do you know of any how to's on the web with pictures? Brakes are one thing I've always been afraid of messing with.
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post #5 of 11 (permalink) Old 04-18-2007, 09:55 PM
 
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If your brake pads were still in place, maybe the pistons didn't come out of their bores. Try taking the top off the master cylinder, put a bunch of paper towels around it (brake fluid eats paint), and use a screwdriver like oldtymebiker says to pry the pads apart. This will force brake fluid into the master cylinder and it may shoot out or overflow. So be prepared. If the pistons came out of the bores, I would replace the piston seals.
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post #6 of 11 (permalink) Old 04-18-2007, 10:02 PM
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a big c-clamp will be your friend!!




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post #7 of 11 (permalink) Old 04-18-2007, 10:21 PM Thread Starter
 
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Hmmm, I'm sure all these methods work, but I started with the easiest, simple prying them apart with hard rubber and plastic screwdrivers. Turns out they didn't compress fully and came apart with almost no pressure. My front calipers have 4 pistons and 2 pads: two pistons per pad. There's a gap just wide enough between the pads to slide a screw driver in. Job done... Unless you still think I should bleed the lines. Only 10,000 miles on this bike so far tho.
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post #8 of 11 (permalink) Old 04-19-2007, 06:46 AM
 
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I keep a large paint stir stick in my tool chest (for 5 gallon paint buckets). I sanded the end down like a chisel and wedge that in between the pads (after blasting the brakes out with brake cleaner). The stir stick is just a fraction thicker than the rotor and after it's wedged in, it's the perfect gap. Plus, wood won't scar the pads.

2005 GIXXER 1K and 2008 ZX 10R.
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post #9 of 11 (permalink) Old 04-19-2007, 06:59 AM
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I just don't hit the brakes when I have the wheels off... has worked for me on my bikes and cars for years.




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post #10 of 11 (permalink) Old 04-19-2007, 05:08 PM
 
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what I've done, although only with 2 piston calipers, is I just pull the pads out if I can, if not, I put a piece of wood in between the calipers and use a pair of plumbers pliers to compress the piston(s).

just have to be careful about it. if you've got 4 or 6 piston calipers, you may have a harder time.
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post #11 of 11 (permalink) Old 04-19-2007, 06:04 PM
 
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i agree with all.

c-clamp for 2 piston cals. (there is usually a place for it to fit)

assorted wedges and drivers for more pistons.
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