Rear break hanging up

fatboy250 · 01-30-2007, 11:13 AM

Have any of you found that the rear brake caliper will hang up from time to time? Dad's does and we have to stop and crack the bleeder valve to release the pressure. We've already changed the brake fluid once. The only other thing left is to completely disassemble each component to see if there is trash in the line somewhere. Before we do this, does anyone else have a suggestion as to what would be causing this?

Jason

red2003 · 01-30-2007, 01:54 PM

Quote:

Originally Posted by fatboy250

Have any of you found that the rear brake caliper will hang up from time to time? Dad's does and we have to stop and crack the bleeder valve to release the pressure. We've already changed the brake fluid once. The only other thing left is to completely disassemble each component to see if there is trash in the line somewhere. Before we do this, does anyone else have a suggestion as to what would be causing this?

Jason

Make sure you haven't filled the resevoir under the side panel too full. There needs to be some air in there to take up the pressure created in the braking system when you are up to speed and the caliper warms up. If that resevoir is too full, the pressure can't "squish" the air in there, and the caliper will begin to close. This in turn makes more heat, more pressure, etc, etc, etc. Both my brake resevoirs were full to the top when I opened up the crate. I'm sure it would have dragged if I hadn't bled some out.

fatboy250 · 01-30-2007, 04:06 PM

Ok, that sounds like that could be it. I know the resevoir is tilted the way it's mounted, so where should the top of the level be so that this doesn't happen. I know Dad has his at the top and mine is near the top. The rubber boot is also something that is in question. Should it be all the way out and into the brake fluid or should it be all the way together at the top? Could this be part of the problem?

Jason

VFRFLYER · 01-30-2007, 07:27 PM

Good question mine has done the samething twice I will check the level should I change the fluid as well. Any pointers on the best way to do that would be appreciated thanks.

BTW Jason Im legal now. I have your number maybe we can go for a ride some weekend soon. the 3 of us it'll be the only china bike gang in Cola. LOL

czowner · 01-31-2007, 04:07 AM

Maybe obvious, but is there a bit of free play in the pushrod? Mine was a little tight.

Jonathan

fatboy250 · 01-31-2007, 06:02 AM

[quote=BTW Jason Im legal now. I have your number maybe we can go for a ride some weekend soon. the 3 of us it'll be the only china bike gang in Cola. LOL

[/quote]

Great news!! Yeah, that would be great! If the weather holds for the weekend, maybe this weekend.

Jason

red2003 · 01-31-2007, 07:55 AM

Quote:

Originally Posted by fatboy250

Ok, that sounds like that could be it. I know the resevoir is tilted the way it's mounted, so where should the top of the level be so that this doesn't happen. I know Dad has his at the top and mine is near the top. The rubber boot is also something that is in question. Should it be all the way out and into the brake fluid or should it be all the way together at the top? Could this be part of the problem?

Jason

The rubber gasket should be "up", fully collapsed, and you only need that resevoir about half full. Leave a good 1/2 in. of air space in there. I'm sure this is your brake problem.

fatboy250 · 01-31-2007, 09:49 AM

Thanks!! Dad's had more of a problem than I have. He'll be glad to fix this problem. Now, if by chance the fluid is as you say with a 1/2 in of space, what next? I know I've cracked the valve on his a couple of times during a ride and let out fluid but didn't really help but for another 10-15 miles then we would have to stop again. Should I have also taken the resevoir cap off and put it back on? Another thing, I think the pad to disk tolerance is very tight when the pads are new. Mine are well worn now along with my rear tire and his aren't since he doesn't ride his very aggressively.

Jason

liverchip · 01-31-2007, 11:13 AM

That's a good point Fatboy. I found the same condition existed on my brand new TSM, but with the reservoir open and the bleed valve open I was able to open the caliper enough to slide it over the rotor, but it was tight.

red2003 · 01-31-2007, 11:20 AM

Quote:

Originally Posted by fatboy250

Thanks!! Dad's had more of a problem than I have. He'll be glad to fix this problem. Now, if by chance the fluid is as you say with a 1/2 in of space, what next? I know I've cracked the valve on his a couple of times during a ride and let out fluid but didn't really help but for another 10-15 miles then we would have to stop again. Should I have also taken the resevoir cap off and put it back on? Another thing, I think the pad to disk tolerance is very tight when the pads are new. Mine are well worn now along with my rear tire and his aren't since he doesn't ride his very aggressively.

Jason

The only reason it would lock up ONLY after riding for a while is if the pressure buildup in the caliper cannot escape. This means one of 2 things. 1) not enough airspace in the resevoir, or 2) a restriction in the line that wont let the fluid return to the resevoir. Easy way to tell is pull off the caliper and try to push the piston back. If you cannot push it back, there's your problem. Could be something in the line, or a collapsed brake hose. If dropping the level in the resevoir doesn't fix it, you'll have to look for a restriction in the line somewhere. If the caliper was frozen, releasing the bleeder valve wouldn't make it any better, so it's gotta be a pressure build up issue as the caliper heats up going down the road. Keep us posted!!!!

fatboy250 · 01-31-2007, 04:29 PM

Yeah that pretty much describes it. He'll be riding along fine at like 50-60 and then start noticing the engine struggling to pull. I will let you know.

VFRFLYER · 01-31-2007, 06:02 PM

Today I took the cap off the brake resovoir sure enough the diaphram was down inside it and was completely extended. I think that may have been my problem. L had never taken the cap off I could just see fluid through the plastic and that was good. Ill ride a while and report back.
fingers crossed

Ray

FMYStreetRacer · 01-31-2007, 10:57 PM

mine has done the same thing twice so far. ui have ordered a complete new new rear brake setup. we'll see if it helps...... i think it;s just the adjustment of the pedal though.

blimpman · 02-02-2007, 08:58 AM

Mine got tight too. Caliper & rotor got purty hot... I just grabbed my 8mm wrench from my toolkit, ( everyone rides with tools, right?) popped the pressure on the caliper and it has been OK since. I am going to replace all the fluid (front & Back) with good DOT 4 fluid soon so it should be OK.

shadowred · 02-04-2007, 02:02 PM

I had a lot of problems with my brakes seizing and I found that my brake line was not lined up correctly which was stopping the fluid flowing back from the brake.

01-30-2007, 11:13 AM	#1
fatboy250 Join Date: Sep 2006 Location: COLUMBIA, SC Posts: 973	Rear break hanging up Have any of you found that the rear brake caliper will hang up from time to time? Dad's does and we have to stop and crack the bleeder valve to release the pressure. We've already changed the brake fluid once. The only other thing left is to completely disassemble each component to see if there is trash in the line somewhere. Before we do this, does anyone else have a suggestion as to what would be causing this? Jason __________________ 2008 Jonway MC-70-150 2007 Roketa DB-07B (RSM-200E) 2006 Roketa DB-07A (RSX-200E) 1995 Kawasaki Concours (ZG1000)
	0

01-30-2007, 04:06 PM	#3
fatboy250 Join Date: Sep 2006 Location: COLUMBIA, SC Posts: 973	Ok, that sounds like that could be it. I know the resevoir is tilted the way it's mounted, so where should the top of the level be so that this doesn't happen. I know Dad has his at the top and mine is near the top. The rubber boot is also something that is in question. Should it be all the way out and into the brake fluid or should it be all the way together at the top? Could this be part of the problem? Jason __________________ 2008 Jonway MC-70-150 2007 Roketa DB-07B (RSM-200E) 2006 Roketa DB-07A (RSX-200E) 1995 Kawasaki Concours (ZG1000)
	0

01-31-2007, 06:02 AM	#6
fatboy250 Join Date: Sep 2006 Location: COLUMBIA, SC Posts: 973	[quote=BTW Jason Im legal now. I have your number maybe we can go for a ride some weekend soon. the 3 of us it'll be the only china bike gang in Cola. LOL [/quote] Great news!! Yeah, that would be great! If the weather holds for the weekend, maybe this weekend. Jason __________________ 2008 Jonway MC-70-150 2007 Roketa DB-07B (RSM-200E) 2006 Roketa DB-07A (RSX-200E) 1995 Kawasaki Concours (ZG1000)
	0

01-31-2007, 09:49 AM	#8
fatboy250 Join Date: Sep 2006 Location: COLUMBIA, SC Posts: 973	Thanks!! Dad's had more of a problem than I have. He'll be glad to fix this problem. Now, if by chance the fluid is as you say with a 1/2 in of space, what next? I know I've cracked the valve on his a couple of times during a ride and let out fluid but didn't really help but for another 10-15 miles then we would have to stop again. Should I have also taken the resevoir cap off and put it back on? Another thing, I think the pad to disk tolerance is very tight when the pads are new. Mine are well worn now along with my rear tire and his aren't since he doesn't ride his very aggressively. Jason __________________ 2008 Jonway MC-70-150 2007 Roketa DB-07B (RSM-200E) 2006 Roketa DB-07A (RSX-200E) 1995 Kawasaki Concours (ZG1000)
	0

01-31-2007, 11:13 AM	#9
liverchip Join Date: Nov 2006 Location: Mystery Spot Posts: 1,223	That's a good point Fatboy. I found the same condition existed on my brand new TSM, but with the reservoir open and the bleed valve open I was able to open the caliper enough to slide it over the rotor, but it was tight. __________________ 2009 XR650L Big Red Pig Tusk bar risers 2007 X-Moto(Jetmoto) GY250 --mods--- 15/40 sprockets UNI Pod Filter 2007 Shineray TMS 200XYi--Betsy Betsy Mods:______________________ Acerbis DHH headlight FMF Powercore pipe Uni Pod Filter
	0

01-30-2007, 07:27 PM	#4
VFRFLYER Join Date: Oct 2006 Location: Columbia, S.C. Posts: 62	Good question mine has done the samething twice I will check the level should I change the fluid as well. Any pointers on the best way to do that would be appreciated thanks. BTW Jason Im legal now. I have your number maybe we can go for a ride some weekend soon. the 3 of us it'll be the only china bike gang in Cola. LOL
	0

01-31-2007, 04:07 AM	#5
czowner Join Date: Sep 2006 Location: North East England Posts: 313	Maybe obvious, but is there a bit of free play in the pushrod? Mine was a little tight. Jonathan
	0

01-31-2007, 04:29 PM	#11
fatboy250 Join Date: Sep 2006 Location: COLUMBIA, SC Posts: 973	Yeah that pretty much describes it. He'll be riding along fine at like 50-60 and then start noticing the engine struggling to pull. I will let you know. __________________ 2008 Jonway MC-70-150 2007 Roketa DB-07B (RSM-200E) 2006 Roketa DB-07A (RSX-200E) 1995 Kawasaki Concours (ZG1000)
	0

01-31-2007, 06:02 PM	#12
VFRFLYER Join Date: Oct 2006 Location: Columbia, S.C. Posts: 62	Today I took the cap off the brake resovoir sure enough the diaphram was down inside it and was completely extended. I think that may have been my problem. L had never taken the cap off I could just see fluid through the plastic and that was good. Ill ride a while and report back. fingers crossed Ray
	0

01-31-2007, 10:57 PM	#13
FMYStreetRacer Join Date: Nov 2006 Location: Ft. Myers, Fl. Posts: 416	mine has done the same thing twice so far. ui have ordered a complete new new rear brake setup. we'll see if it helps...... i think it;s just the adjustment of the pedal though. __________________ Roketa DB-07a HID Headlight
	0

02-02-2007, 08:58 AM	#14
blimpman Join Date: Sep 2006 Location: Cuyahoga Falls, Ohio Posts: 267	Mine got tight too. Caliper & rotor got purty hot... I just grabbed my 8mm wrench from my toolkit, ( everyone rides with tools, right?) popped the pressure on the caliper and it has been OK since. I am going to replace all the fluid (front & Back) with good DOT 4 fluid soon so it should be OK. __________________ The destination is merely a by-product of the journey. '06 KLR650 '06 XT225 '92 XT225 Serow ( MBD.... Multiple Bike Disease...)
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02-04-2007, 02:02 PM	#15
shadowred Join Date: Aug 2006 Location: Scotland Posts: 38	I had a lot of problems with my brakes seizing and I found that my brake line was not lined up correctly which was stopping the fluid flowing back from the brake.
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