K11 Owners Group Forum Index K11 Owners Group
K11 Owners Group
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Dragging rear brake

 
Post new topic   Reply to topic    K11 Owners Group Forum Index -> Tech
View previous topic :: View next topic  
Author Message
Stoked Steve
Flying Brick Rider


Joined: 01 Sep 2004
Posts: 1402
Location: Virginia Beach, VA

PostPosted: Fri May 14, 2010 9:48 pm    Post subject: Dragging rear brake Reply with quote

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
Back to top
View user's profile Send private message
BobZ(IL)
Flying Brick Rider


Joined: 20 May 2007
Posts: 631
Location: Bourbonnais, IL

PostPosted: Fri May 14, 2010 11:41 pm    Post subject: Reply with quote

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.
Back to top
View user's profile Send private message
Shoganai
Biscuit Fluffer


Joined: 27 Apr 2005
Posts: 2234
Location: Culpeper,VA

PostPosted: Sat May 15, 2010 12:17 am    Post subject: Reply with quote

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
Back to top
View user's profile Send private message Send e-mail
tmarshall57
Mad Brick Rider


Joined: 07 May 2007
Posts: 98
Location: Tottington, Bury, Lancs, UK

PostPosted: Sat May 15, 2010 7:39 am    Post subject: Reply with quote

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
Back to top
View user's profile Send private message
Stoked Steve
Flying Brick Rider


Joined: 01 Sep 2004
Posts: 1402
Location: Virginia Beach, VA

PostPosted: Sat May 15, 2010 8:17 am    Post subject: Reply with quote

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
Back to top
View user's profile Send private message
SugarHillCTD
Site Admin


Joined: 10 Oct 2007
Posts: 4107
Location: Sugar Hill, NH, USA

PostPosted: Sat May 15, 2010 8:40 am    Post subject: Reply with quote

skdonlan wrote:
....Reading the posts of peoples bikes catching on fire from rear brakes binding.....


That would liven things up at HM Shocked 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...... Laughing
_________________
John & Cathy

'92 K100RS4V Pearl White
2009 R1200RT Black
gone-'14 Triumph Daytona 675R
IBA Several-SS1k, BBG, 50CC NYC to S.F.
Back to top
View user's profile Send private message Send e-mail
tmarshall57
Mad Brick Rider


Joined: 07 May 2007
Posts: 98
Location: Tottington, Bury, Lancs, UK

PostPosted: Sat May 15, 2010 9:47 am    Post subject: Reply with quote

skdonlan wrote:
Reading the posts of peoples bikes catching on fire from rear brakes binding has me a little spooked.


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 Smile
_________________
K1100RS Special Edition 1997
Arctic Silver/Black
Back to top
View user's profile Send private message
Stoked Steve
Flying Brick Rider


Joined: 01 Sep 2004
Posts: 1402
Location: Virginia Beach, VA

PostPosted: Sat May 15, 2010 11:51 am    Post subject: Reply with quote

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
Back to top
View user's profile Send private message
Scott_Anderson
Flying Brick Rider


Joined: 05 Sep 2006
Posts: 2878
Location: Central Iowa, USA

PostPosted: Sat May 15, 2010 11:25 pm    Post subject: Reply with quote

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.


1997 K1100LT 0302488
1995 K1100LT 0302044
Garmin StreetPilot 2820
Garmin Zumo 550
"One who does not ask questions is ashamed to learn" Danish proverb
Back to top
View user's profile Send private message Yahoo Messenger
Display posts from previous:   
Post new topic   Reply to topic    K11 Owners Group Forum Index -> Tech All times are GMT - 4 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group