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Author Topic: Caliper piston still stuck!  (Read 1806 times)

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Offline Cartman98

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Caliper piston still stuck!
« on: August 23, 2009, 11:59:17 AM »
So when I bought my bike the PO said the caliper had locked up.  I took it apart and scraped all the corrosion I could out of it and put it back together, that didn't work.  I took it apart again and used a brass wire wheel on a Dremel, it was a bit better but it is still grabbing!  I did it again and no joy.  Is there something else I should try?
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Offline twowheellord

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Re: Caliper piston still stuck!
« Reply #1 on: August 23, 2009, 12:00:35 PM »
replace the seal also you might try cleaning any corrosion up with a polishing wheel
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Offline Cartman98

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Re: Caliper piston still stuck!
« Reply #2 on: August 23, 2009, 12:16:15 PM »
Should the piston move almost as freely as when the seal isn't in the caliper?
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Offline BeSeeingYou

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Re: Caliper piston still stuck!
« Reply #3 on: August 23, 2009, 12:31:50 PM »
It should fall out without the seal in place.
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Offline Cartman98

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Re: Caliper piston still stuck!
« Reply #4 on: August 23, 2009, 12:37:25 PM »
I know the piston moves freely without the seal in place, but should it move almost as easy with the seal in?
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Offline BeSeeingYou

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Re: Caliper piston still stuck!
« Reply #5 on: August 23, 2009, 01:30:20 PM »
No it should take a bit of force to push the piston in with the seal in place and it should stay in place if you turn it upside down.
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Offline Toxic

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Re: Caliper piston still stuck!
« Reply #6 on: August 23, 2009, 04:11:55 PM »
Your Honda dealer has the seals for 5 bucks. If the resistance is the same with or without the seal, your seal is toast or you removed too much material from the groove.  Not likey if you used a brass brush.
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Offline Cartman98

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Re: Caliper piston still stuck!
« Reply #7 on: August 23, 2009, 05:04:06 PM »
No, the problem is that the piston does not move very freely at all once the seal is in.  It is much better now that I've cleaned it all out, but when I took it around the block the rotor is nice and hot because the pad is not releasing as much as it should.
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Offline ekpent

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Re: Caliper piston still stuck!
« Reply #8 on: August 23, 2009, 06:12:25 PM »
Did you put in new pads by chance. I bought 4 sets from TAS that were super inexpensive,made in italy but they needed alot of prep.Had to remove some of the brake material around the outside edges,or dress them up, so that they would fit properly and not bind up.Just a thought ???
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Offline Cartman98

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Re: Caliper piston still stuck!
« Reply #9 on: August 23, 2009, 06:25:26 PM »
The pads were all chewed up from when he tried to remove them or something.  I ordered more from Dennis Kurk so hopefully they will help.
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Offline ekpent

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Re: Caliper piston still stuck!
« Reply #10 on: August 23, 2009, 06:33:52 PM »
When you get them just try test fitting them in the caliper first to make sure there is no binding and if they are too tight dress up the outside with some sandpaper or something so all will work smoooooth. Good luck and let us know how it turns out.
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Offline Cartman98

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Re: Caliper piston still stuck!
« Reply #11 on: August 25, 2009, 03:44:31 PM »
I got all the parts and took the caliper apart again and took the wire wheel to it once more to make sure I didn't have to do it again.  I test fit the new pad and I would have had to press the thing in there if I wanted it in the caliper where it belonged.  I took off all the paint on the pad where it would contact the surface of the caliper and it finally fit with no binding!  Long story short it works and doesn't bind at all anymore!

... I did find out that the master cylinder appears to be leaking from around where the lever is!  Never ending!
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Offline MoTo-BunnY

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Re: Caliper piston still stuck!
« Reply #12 on: August 25, 2009, 08:22:05 PM »
Quote from: Cartman98 on August 25, 2009, 03:44:31 PM
I got all the parts and took the caliper apart again and took the wire wheel to it once more to make sure I didn't have to do it again.  I test fit the new pad and I would have had to press the thing in there if I wanted it in the caliper where it belonged.  I took off all the paint on the pad where it would contact the surface of the caliper and it finally fit with no binding!  Long story short it works and doesn't bind at all anymore!

... I did find out that the master cylinder appears to be leaking from around where the lever is!  Never ending!

You can get a rebuild kit for the MC and fix that or replace it with aftermarket or MC off of other bikes that will work.

Lots of past posts that cover that, if you do a search. I wish ya luck as brakes = good to have.    ;)
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Offline mystic_1

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Re: Caliper piston still stuck!
« Reply #13 on: August 25, 2009, 08:25:55 PM »
Clean the pressure release hole inside the master cylinder reservoir.  There's a big hole and a small hole, when bikes sit for a long time the small one tends to clog up and cause this problem.

mystic_1
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Offline MoTo-BunnY

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Re: Caliper piston still stuck!
« Reply #14 on: August 25, 2009, 08:46:05 PM »
Quote from: mystic_1 on August 25, 2009, 08:25:55 PM
Clean the pressure release hole inside the master cylinder reservoir.  There's a big hole and a small hole, when bikes sit for a long time the small one tends to clog up and cause this problem.

mystic_1

The hole clogging up causes the leak?  weird, if so. ..  .
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hoppin' on down the bunny trail . . .

1973 Honda CB500K2
1970 Ding-How aka Nova R-S w/3.5HP Tecumseh MiniBike
1970 Taco Model 22 deluxe w/3.0HP Briggs & Stratton MiniBike
1973 GMC Vandura 3/4 Ton Van (350CID V8)
1973 Dodge "Chinook" RV (360CID V8)
1985 Toyota Tercel Wagon SR5 (4WD - 3A engine)
1982 Toyota Pickup Truck (2WD - 22R engine)
1962? DriveX Pack-Mule (Tote-Gote clone)
1989 VW Jetta GLi 16V
1991 Diamondback Mtn. Bike

Offline mystic_1

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Re: Caliper piston still stuck!
« Reply #15 on: August 25, 2009, 08:50:13 PM »
Oops, missed the last post where he resolved the retraction problem.

My bad.

mystic_1
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"A ship in harbor is safe, but that is not what ships are built for."
- John Augustus Shedd

My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline MoTo-BunnY

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Re: Caliper piston still stuck!
« Reply #16 on: August 25, 2009, 08:52:37 PM »
Quote from: mystic_1 on August 25, 2009, 08:50:13 PM
Oops, missed the last post where he resolved the retraction problem.

My bad.

mystic_1

Oh, OK. . .lol. .  .you threw me there, I was trying to think through the physics of that and coming up with *huh*?    ;)
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---> instagram.com/moto_bunny# <---

[img width= height=]http://farm4.static.flickr.com/3440/3846213109_ae572002d4_o.gif[/img]

hoppin' on down the bunny trail . . .

1973 Honda CB500K2
1970 Ding-How aka Nova R-S w/3.5HP Tecumseh MiniBike
1970 Taco Model 22 deluxe w/3.0HP Briggs & Stratton MiniBike
1973 GMC Vandura 3/4 Ton Van (350CID V8)
1973 Dodge "Chinook" RV (360CID V8)
1985 Toyota Tercel Wagon SR5 (4WD - 3A engine)
1982 Toyota Pickup Truck (2WD - 22R engine)
1962? DriveX Pack-Mule (Tote-Gote clone)
1989 VW Jetta GLi 16V
1991 Diamondback Mtn. Bike

Offline ekpent

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Re: Caliper piston still stuck!
« Reply #17 on: August 25, 2009, 09:08:48 PM »
OK-He has a leak-whoops so do I be back in a second----------Make sure you do not have a bad line also. Sometomes a hydro line will let you put the pressure in but will not let the pressure release and cause the caliper to "seize". Found out the hard way on my Dodge Maxi Van on  200 mile road trip from the North one time,made it Home without hittin the brakes ;D
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