Almost burnt down this moring...GREAAAAT..

[TonUpSoldier]

SOoo, I rode to work this morning, after dickin with those carbs my whole weekend, just to see how she'd do...still needs dialed in a bit, down low especially. At any rate, about half way there, i start noticing every time i let off the throttle the bike decels rapidly, at first i was thinking i was having engine trouble, because i had just rebuilt my rear master, and pulled the caliper apart and cleaned it a couple weeks ago, so i didnt think anything of that, and my front was responding fine, but then i notice my rear brake has gone stiff as hell, so i limp it to the nearest gas station and by the time i get there theres so much smoke pouring off the back of my bike i cant tell what the hell is on fire... Then the smoke clears a bit and i see its coming off my caliper. The pistons are stuck, and rubbing like a SOB and cooking the fluid. $HIT! No good at all..im very irritated because i stripped that damn thing apart and found nothing, no rust, dirt, glop, no warping, nothing...Luckily there was a guy there in a work van who lent me an adjustable wrench and after it cooled a bit i loosened the bleeders and pumped some fluid out, careful not to let any air in..i used the wrench to push the pad off the rotor and limped it to work without using the rear. At lunch i had a buddy from work run me home to grab a wrench, my bleeder kit and i bought some new fluid and flushed the system, hoping that the little bit of sediment i found in the bleeder kit resoviour was the culprit. Alas, it was not as it started to get tight again on the way home.. I repeated the process from earlier in the day and limped it home. So now i dunno..ill strip the caliper apart again and see if i see anything going bad..Other than that i cant say what the hell is causing it?

Anyone have any idea?
Whats a good place to find complete rebuild kits for these?


Thanks!!

 

[tobiism]

Sounds like one of two things, the return port in the reservoir is clogged, or the dust seal on the piston has junk in it that will not allow it to retract after you let off of the brake.

 

[locOleoN]

contact harry at Sirius Consolidated...

Harry is also a member...aka: Harry

He should have everything that you need to rebuild that puppy.

(519) 585-0534

62 McBrine Place Suite #8
Huron Business Park
Kitchener, Ontario
N2R 1H3

 

[TonUpSoldier]

Thanks N! I found a rebuild kit that even has new piston cups, but its kinda spensive...not bad but ill give Harry a call and see what he's got...someone suggested i should switch to steel line in the back there too since the old rubber might be starting to break down and throw crap into my fluid. I pulled that caliper apart today and aside from some surface corrosion where the cups are open to the air, i really didnt see anything...bled the system real good, but it still doesnt feel right and i rode for a bit and my rotor was hot as hell when i stopped...Not TOO worried right now, cos for the time being im not riding shit. My KZ is out of comish for an electrical issue, still havent gotten that XS400 running on anything but choke, and i just stripped apart my carbs on the GS...bummer...my season my be over already..But its all for the best i spose

 

[brian weir]

SOoo, I rode to work this morning, after dickin with those carbs my whole weekend, The pistons are stuck, and rubbing like a SOB and cooking the fluid.
Anyone have any idea?
Thanks!!

I agree, This sounds like the classic little tiny return or relief port in the reservoir is plugged somewhere, my CBX had that and it was so small it was almost impossible to spot. it acted as a check to pump up the brake until it locked. After ever so carefully taking it apart and finding the hole and slightly enlarging it, all was well. Pretty scary as the front wheel got tighter and tighter.