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Author Topic: Rear brake not releasing properly  (Read 409 times)

Offline Mark3k

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Rear brake not releasing properly
« on: June 10, 2013, 06:04:19 PM »
 ^-^ Here's the gist of the issue: I had a friend help me change out the rear tire of my 2003 V-Star 1100. When we got her all back together, the back brake didn't work at all. Checked the fluid...yep, needed a fill up. I bled the fluid like I was told, then took off again. This time, the brakes worked TOO WELL!! With my foot completely off the brake pedal (and NO front brake applied), the bike would come to a complete stop. I do need some new caliper pins (there are currently bolts and nuts there...had to improvise) and they are headed this way from the U.K. I took the caliper apart and cleaned it but it still doesn't release if I apply the back brake too much.
Help...? Please...? ^-^
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Offline SlowRoad

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Re: Rear brake not releasing properly
« Reply #1 on: June 10, 2013, 06:10:04 PM »
If you have cleaned the caliper piston well, the rubber line could be breaking down on the inside.  Had that happen on a couple of trucks where the brake was slow to react and release on one side.  Made it seem like a caliper was sticking.  I replaced calipers on the first one before I figured out it was the rubber line.  Second one, lines got replaced first!!   :-*
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Offline Mark3k

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Re: Rear brake not releasing properly
« Reply #2 on: June 10, 2013, 06:11:45 PM »
So maybe just doing a rebuild kit? Or replacing the entire back brake line?
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Offline yamahamer

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Re: Rear brake not releasing properly
« Reply #3 on: June 10, 2013, 06:26:36 PM »
If you kinked or twisted the brake line during the tire change it's what Tim said.
Replace the rear brake line.

Offline springer

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Re: Rear brake not releasing properly
« Reply #4 on: June 10, 2013, 06:29:34 PM »
 From what you said in your first post you had replaced the pins with bolts cause the pins were worn? How are the pads sliding? On the threads? If so the threads will catch the pads, not allowing the pads to come off the brake disk. This will cause the disk. caliper, and brake fluid to get very hot. Depending on how hot it could cause the fluid to expand and push the piston out, causing MORE heat until the brake locks up.

 If the pins are worn, it is time to rebuild the caliper and replace the line. It is very advisable to rebuild the master cylinder too.


 And take a very good look at the front brakes too.
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Offline SlowRoad

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Re: Rear brake not releasing properly
« Reply #5 on: June 10, 2013, 06:31:05 PM »
If it's the line, it'll just be in the rubber part.  You can replace just the rubber line on some bikes, but some are all made together so that you have to replace the whole line. 

Are your return springs on the pedal working properly?  If it just started acting up after you worked on the rear, I would check all the linkages and mounts first and make sure they all look good.

Did you remove the piston during the cleaning process?  If not, you may need to push it out past where it was running and clean it really well.  If you have already done that, I would check the pedal and linkages, then go from there.
"The thing I like most about BR is you never meet strangers just new friends."      Smiley

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1998 Kawasaki KLR650
1981 Kawasaki KZ1100 project
1979 Kawasaki KZ750 twin project in waiting

Offline springer

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Re: Rear brake not releasing properly
« Reply #6 on: June 10, 2013, 06:31:45 PM »
^-^ Here's the gist of the issue: I had a friend help me change out the rear tire of my 2003 V-Star 1100. When we got her all back together, the back brake didn't work at all. Checked the fluid...yep, needed a fill up. I bled the fluid like I was told, then took off again. This time, the brakes worked TOO WELL!! With my foot completely off the brake pedal (and NO front brake applied), the bike would come to a complete stop. I do need some new caliper pins there are currently bolts and nuts there...had to improvise) and they are headed this way from the U.K. I took the caliper apart and cleaned it but it still doesn't release if I apply the back brake too much.
Help...? Please...? ^-^
Never improvise a brake system.
BamaRides...come for the ride, stay for the harassment!-Davinci
Here we are, trapped in the amber of the moment, There is no why. Kurt Vonnegut

Offline Mark3k

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Re: Rear brake not releasing properly
« Reply #7 on: June 10, 2013, 06:32:27 PM »
From what you said in your first post you had replaced the pins with bolts cause the pins were worn? How are the pads sliding? On the threads? If so the threads will catch the pads, not allowing the pads to come off the brake disk. This will cause the disk. caliper, and brake fluid to get very hot. Depending on how hot it could cause the fluid to expand and push the piston out, causing MORE heat until the brake locks up.

 If the pins are worn, it is time to rebuild the caliper and replace the line. It is very advisable to rebuild the master cylinder too.


 And take a very good look at the front brakes too.

The pins weren't worn, one was just missing. We couldn't get any at 6:00 in Cullman, so we had to use the bolts. The brakes were working fine BEFORE the tire change. It is possible that the line was twisted.
Just a pilgrim passing through this life, living to serve a Risen King...hoping to pass many a mile between here and There...
“Forgive me for being so ordinary while claiming to know so extraordinary a God.” ~ Jim Elliot
www.needgod.com www.safehavenchurch.com

Offline Mark3k

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Re: Rear brake not releasing properly
« Reply #8 on: June 10, 2013, 06:34:15 PM »
If it's the line, it'll just be in the rubber part.  You can replace just the rubber line on some bikes, but some are all made together so that you have to replace the whole line. 

Are your return springs on the pedal working properly?  If it just started acting up after you worked on the rear, I would check all the linkages and mounts first and make sure they all look good.

Yes, the return springs are fine.

Did you remove the piston during the cleaning process?  If not, you may need to push it out past where it was running and clean it really well.  If you have already done that, I would check the pedal and linkages, then go from there.

I did remove it and clean it.
Just a pilgrim passing through this life, living to serve a Risen King...hoping to pass many a mile between here and There...
“Forgive me for being so ordinary while claiming to know so extraordinary a God.” ~ Jim Elliot
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Offline kwb377

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Re: Rear brake not releasing properly
« Reply #9 on: June 10, 2013, 06:59:53 PM »
Any particular reason the pins were ordered from the U.K.?

If you haven't checked here already, Ron Ayers is a great place to get OEM parts. You will usually have them on your doorstep in @ 3 days.


http://www.ronayers.com/REAR-BRAKE-CALIPER--C41190.aspx
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'11 Ninja 1K

Offline gdenn

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Re: Rear brake not releasing properly
« Reply #10 on: June 10, 2013, 08:32:18 PM »
BINGO for springer.  The bolts are keeping the brakes from releasing.  Replace them with the correct pins and problem solved.

Offline Mark3k

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Re: Rear brake not releasing properly
« Reply #11 on: June 11, 2013, 02:41:10 PM »
The pins from the UK were the best and quickest I could find on ebay. I will bookmark the site you gave so I can get stuff quicker (thanks for that).

The only thing about the bolts (and I have no doubt that isn't helping) is that the problem existed before we put those in and it was missing a pin. Hopefully the proper pins will solve the problem.

Someone else also mentioned the possibility that there was too much fluid and I should bleed more off.
Just a pilgrim passing through this life, living to serve a Risen King...hoping to pass many a mile between here and There...
“Forgive me for being so ordinary while claiming to know so extraordinary a God.” ~ Jim Elliot
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Online Brian A

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Re: Rear brake not releasing properly
« Reply #12 on: June 11, 2013, 04:59:21 PM »
It's a stretch but worth checking.....

The brake pedal will push a rod that runs into the brake master cylinder. The master cylinder pushes the brake fluid to the caliper assembly to compress the pads.
If, for whatever reason, the pin is in a bind and not releasing when you let off the brake pedal, then the brakes are still on when you let off the pedal.

Easy enough to check and rule out.

Also... is there ANY chance you got some spacers messed up and the rear rotor is not riding in the proper position? Shifted to one side a little and as a result constantly pressing against a pad?
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Offline Mark3k

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Re: Rear brake not releasing properly
« Reply #13 on: June 11, 2013, 05:35:18 PM »
Also... is there ANY chance you got some spacers messed up and the rear rotor is not riding in the proper position? Shifted to one side a little and as a result constantly pressing against a pad?

There is a chance but I don't think so. We did a complete sweep of the garage when we were done. Nothing left on floor. Good thought though...!
Just a pilgrim passing through this life, living to serve a Risen King...hoping to pass many a mile between here and There...
“Forgive me for being so ordinary while claiming to know so extraordinary a God.” ~ Jim Elliot
www.needgod.com www.safehavenchurch.com