ADVrider

Go Back   ADVrider > Bikes > Orange Crush > Crazy-Awesome almost Dakar racers (950/990cc)
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 05-03-2015, 09:57 PM   #1
tomdubz OP
getting there
 
tomdubz's Avatar
 
Joined: Jun 2010
Location: POW
Oddometer: 522
Rear Brake Fire

Well, I went and rebuilt by brake calipers all around.

Similar to this: http://www.ktm950.info/how/Orange%20...ndon_rear.html

Was confident that they were solid after going for a quick 10 min ride around the block last week. But I was wrong. I went for a longer ride and stopped for gas. Low and behold my rear brake was on fire - lost pressure, fluid squirting out the pistons when pressing pedal, cooked/melted pads, and gunk all over the caliper. After getting a fire extinguisher on the scene, I was able to limp home w/o using the rear brake. I kept testing the front on the way home, worried that they would fail too. They did not. I'm assuming I did something horribly wrong with the seals.

The questions:

Do I just order another caliper or could I possibly salvage the old one? It was on fire and my instincts tell me to just break down and get another. Anyone with experience?

Will I be able to get the cooked gunk off the rotor or am I looking at buying a new one of those too?

And... should I be worried about the fronts?
__________________
This is my signature: TD
tomdubz is offline   Reply With Quote
Old 05-03-2015, 11:42 PM   #2
gefr
Life is a trip
 
gefr's Avatar
 
Joined: Nov 2005
Location: East Med, Greece
Oddometer: 4,012
Most probable cause would be air in the lines. This expanded with heat and pressed the pads on the disc continuously, setting them on fire. Discs can be scrubbed with scotch brite. The master pump could have problems, from the high temps. Can't comment on that.
Cheers
gefr is offline   Reply With Quote
Old Yesterday, 01:34 AM   #3
Peanuts
Beastly Adventurer
 
Peanuts's Avatar
 
Joined: Sep 2009
Location: UK
Oddometer: 1,673
You may have had too much fluid in the system. As the brake warmed up the fluid expanded and had no-where to go but push out the pistons, making the situation worse and worse.

Another possibility is there was not enough play at the lever, closing the port in the master cylinder, having the same effect.
Peanuts is offline   Reply With Quote
Old Yesterday, 03:45 AM   #4
Racer111v
Studly Adventurer
 
Racer111v's Avatar
 
Joined: Aug 2011
Location: Hudson, NH
Oddometer: 816
Replace the wheel bearings on at least the brake side. Every time I have had a rear brake drag it cooks the seal on the wheel bearing. They don't last long after that. The rear rotor is most likely warped also and will need to be replaced. The piston most likely stuck in the bore and dragged the pads.
__________________
2004 KTM 950 ADV ...............................1979 Suzuki RM400 VMX Race bike
2006 DR-Z400E plated........................... 2001 Ducati ST2 944
2001 YZ250N 2T plated.......................... 1986 Yamaha FJ1200
Racer111v is offline   Reply With Quote
Old Yesterday, 11:37 AM   #5
tomdubz OP
getting there
 
tomdubz's Avatar
 
Joined: Jun 2010
Location: POW
Oddometer: 522
Quote:
Originally Posted by Racer111v View Post
Replace the wheel bearings on at least the brake side. Every time I have had a rear brake drag it cooks the seal on the wheel bearing. They don't last long after that. The rear rotor is most likely warped also and will need to be replaced. The piston most likely stuck in the bore and dragged the pads.
I love good news. So, replace the caliper entirely or rebuild?
__________________
This is my signature: TD
tomdubz is offline   Reply With Quote
Old Yesterday, 11:48 AM   #6
booger1
Studly Adventurer
 
booger1's Avatar
 
Joined: Mar 2010
Location: Arizona
Oddometer: 907
Laugh

I would replace. I'm not saying I could have rebuilt it ( I've never done it) but if that was my first results. My bike catching on fire.
__________________
Eating_goat_with_the_Cartel , Never_ventured_never_gained
oncostaricantime , boundlessbooger , 1998xr400buildwithe-start
Good judgment comes from experience. Experience comes from bad judgment - Mark_Twain

.
booger1 is online now   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 05:31 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2015