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Stoked Steve Flying Brick Rider
Joined: 01 Sep 2004 Posts: 1402 Location: Virginia Beach, VA
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Posted: Fri May 14, 2010 9:48 pm Post subject: Dragging rear brake |
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My rear brake has been lightly dragging for awhile and I can't seem to find the issue.
A few weeks ago I took apart the cailiper and pulled out the seals and covers and o-rings and such and cleaned them all real well. I found some sand-like grit under one of the seal covers and I was hoping that was the issue. No luck, still a slight dragging. So then I ordered a caliper rebuiild kit and replaced the seals, covers, and O-rings and still no joy.
When the bike is on the center stand and I rotate the rear wheel, I hear a very slight scrapping sound, it's certainly not binding, just lightly dragging. Do you guys hear any brake scrapping when you rotate the rear wheel? Even just slightly?
I went out for a ride today and it was quite hot here, about 91 degrees. After about 15 miles I pulled over and felt the rear disc, it was hot, almost too hot to keep a touch on it, and the rear end was real hot also. So I'm thinking this is from the dragging brake.
My next thought is a MC rebuild, or at least diassasemble and clean. I'm hoping it's not the brake lines, although they're old, the M/C seems to work well. No leaks and I can see the fluid pumping out, and then returning slightly when the pedal is released during bleeding.
I've checked the clearance at the foot pedal and it's fine, I even opened it up a bit just to be sure.
I'm also a little concerned that maybe the final drive is causing this heat, possibly due to, or a cause of my U-joint failure last year(?). If I spin the rear wheel as hard as I can while on the center stand, it only spins about 1 1/2 times before stopping. I tried this when I had the rear caliper removed and got about the same rotation. Does that sound about right?
Any other thoughts??? I'd like to get this sorted out before heading out for HMIII next week. _________________ Steve
Virginia Beach, VA
93 K1100RS Mystic Red SOLD
12 Suzuki DL650A VStrom |
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BobZ(IL) Flying Brick Rider
Joined: 20 May 2007 Posts: 651 Location: Bourbonnais, IL
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Posted: Fri May 14, 2010 11:41 pm Post subject: |
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My rear wheel takes much effort to get a turn and a half rotation and the brake pads are creating some noise, but I think that's pretty normal. _________________ '93 K1100LT
'78 R100S
'05 R1200GS
BMWMOA, CRBMWOA, ABC, K11OG #997
Live well, do good work, enjoy the ride. |
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Shoganai Biscuit Fluffer
Joined: 27 Apr 2005 Posts: 2234 Location: Culpeper,VA
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Posted: Sat May 15, 2010 12:17 am Post subject: |
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BobZ(IL) wrote: | , but I think that's pretty normal. |
Yes, a slight drag if fine, don't worry about it Steve. _________________ 1993 K1100RS aka The Shop Whore
1994 K1100RS aka Blue Streak
The long road is a rainbow and the pot of gold lies there.
So slip the chain and I'm off again,
You'll find me everywhere. I'm a Rover. - JT
Nana korobi ya oki |
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tmarshall57 Mad Brick Rider
Joined: 07 May 2007 Posts: 98 Location: Tottington, Bury, Lancs, UK
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Posted: Sat May 15, 2010 7:39 am Post subject: |
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Mine has slight drag also. I noticed that when I last changed the brake pads that one pad was more worn than the other. The same is occurring with the new pads.
I had thought about investigating the cause - initially just to check that both pistons are free. Have not got around to this yet.
I did a M/C rebuild due to leakage a couple of years back and this has been fine since.
To be honest I think there is a slight level of drag on most disc/pad brake systems. _________________ K1100RS Special Edition 1997
Arctic Silver/Black |
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Stoked Steve Flying Brick Rider
Joined: 01 Sep 2004 Posts: 1402 Location: Virginia Beach, VA
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Posted: Sat May 15, 2010 8:17 am Post subject: |
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Thanks for the reassurances. Reading the posts of peoples bikes catching on fire from rear brakes binding has me a little spooked.
The pads are worn pretty well, there's only about 3mm left (1.5mm is the minimum),so I've got a new set coming, thinking maybe that'll push the pistons back in a bit and they'll operate better.
Thanks again. _________________ Steve
Virginia Beach, VA
93 K1100RS Mystic Red SOLD
12 Suzuki DL650A VStrom |
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SugarHillCTD Site Admin
Joined: 10 Oct 2007 Posts: 4240 Location: Now in Eastern Pennsylvania
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Posted: Sat May 15, 2010 8:40 am Post subject: |
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skdonlan wrote: | ....Reading the posts of peoples bikes catching on fire from rear brakes binding..... |
That would liven things up at HM If you don't get those new pads, could we ask you to ride "sweep" at HM so the rest of us aren't caught up in the inferno......OH, the humanity...... _________________ John & Cathy
'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F. |
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tmarshall57 Mad Brick Rider
Joined: 07 May 2007 Posts: 98 Location: Tottington, Bury, Lancs, UK
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Posted: Sat May 15, 2010 9:47 am Post subject: |
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skdonlan wrote: | Reading the posts of peoples bikes catching on fire from rear brakes binding has me a little spooked.
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I suspect serious brake binding like this is caused by incorrectly setting the play at the pedal/master cylinder. I did something similar on the front brakes - at least you see the smoke at the front _________________ K1100RS Special Edition 1997
Arctic Silver/Black |
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Stoked Steve Flying Brick Rider
Joined: 01 Sep 2004 Posts: 1402 Location: Virginia Beach, VA
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Posted: Sat May 15, 2010 11:51 am Post subject: |
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I'd lke to keep the fires limited to the fireplaces, thank you. _________________ Steve
Virginia Beach, VA
93 K1100RS Mystic Red SOLD
12 Suzuki DL650A VStrom |
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Scott_Anderson Site Admin
Joined: 05 Sep 2006 Posts: 3119 Location: Central Iowa, USA
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Posted: Sat May 15, 2010 11:25 pm Post subject: |
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You will have an indication of real drag when you pull in the clutch and you start slowing down(more than coasting) without touching the brake pedal or levers.
I'd be looking for something then.
Mine also have a slight(very slight) pad drag on the rear disk. _________________ Ride safe.
1995 K1100LT 0302044
1997 R1100RT ZC62149
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.) |
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