i have no experience what so ever with modern anti on mc's, but i can't fathom how the brake would lock up on a non-running bike , most likely with the key off. i'd be looking for mechanical interference. is it completely locked in both directions? no play forwards or backwards? braking system cold at the time? you didn't just get done riding did you? i have seen old school bikes lock up during or after a ride. never cold.

 

The bike was cold and I feel the same way. How was it possible? The bike had sustained damage from a fall from a while ago. But the damage was to the front handlebar and not the rear brake. I replaced the handlebar, throttle grip switch assembly, front brake master cylinder, grips, new battery and bleed the front and rear brakes.

Front brake works fine. Rear brake locks up after moving the bike forward or backward a foot each way.

I'm going to check the rear caliper next. Any input is welcomed.

 

did the rear disc get bent? i'd unbolt the caliper and see how it spins then. if it does, hold a screw driver to the disc and spin the wheel. easy way to see if the disc is still straight. if it won't spin without the caliper..... fried bearings? bolt backed out and jamming?
pull the caliper. and see if the wheel spins. i suspect it's the caliper at fault here.

 

I

Thank you, I appreciate the advice and will try it out!!

 

luck!
l'll check back after i mow a couple acres.

 

Have you checked that the pin holding the brake pads is fully located? If not it will catch on the wheel spokes.
Check the wheels very carefully for "witness marks" to see if anything is interfering with the wheel.
Good luck
Rob

 

I did check the pin and it's not hindering it. I do feel some slight rubbing coming from the caliper, though. The rim is locked in the position to where I can't fully remove the pin, it keeps hitting the spoke. Any other ideas?

 

now THAT'S something i would do! doesn't sound like she just did a brake job though.

 

I only flushed the brake fluid. I did pop the sprocket off tonight and found it spins freely at the point of the engine with the chain off. Rear tire is still locked up.

 

i think i might be losing something in the translation between our languages. you took the countershaft sprocket off? wheel still stuck? you did pull the caliper off the disc, right?
i'm sorry. i'm still trying to figure out why you're now thinking it's related to your transmission........

 

I tried taking off the caliper, but I don't have enough strength to loosen the bolt. So, I decided to check the other end, until I can find someone to loosen the bolt to remove the caliper. It's definitely the caliper that's causing the issue, since the gear spins freely when I take off the chain. Apologize for not knowing the terminology. I'm new to repairing my own bike and I haven't worked on a vehicle since my 20's.

 

sorry. i just woke and haven't had my coffee. grumpy old man stuff.

 

Don't know if you need to move it NOW or not but you could get it rolling again with the bleed screw on the caliper. Turn it just enuf to release pressure in the caliper... clean up any brake fluid released. Love your nails!

 

I tried that with the bleeder screw, it didn't release enough. I did however, take off the back tire and remove the caliper. Then started putting it back together and that may have did the trick. The tire can now rotate fully. I also released the bleeder valve while putting the brake pads back on. Fingers crossed when I tighten everything up it cured the issue. Thanks about the nails, they need a touch up after this. Lol

 

Good that you figured it out ... now try to change that brake fluid. If the problem was from corrosion from water this will flush out the water at least. If it is corroded (white or opaque fluid) then you'll need to take that caliper apart.

 

agree with condesending Spartusux comment. rebuild the caliper. or at least get those nails dirty and give it a good scrub down with a scotch bright pad.

guess i'll back out. continue mowing the lawn. let the pedicurist take over for a bit.

 

Condescending? Trying to help here, bud... that's all.

 

sorry. i'm not in good place and am grouchy. please accept my apology?

i hope she's having luck on that bike though. knee-deep in a caliper re-build, is still my best guess.

 

You're right, the caliper seems to be causing the issue. When I take the break pads out the wheel doesn't lock up. When I put them back in and tighten everything up, it locks up or rubs really bad on the wheel.

 

no worries mate

 

See if you can (with pads out) pry the brake pistons open with a flat blade screwdriver. Then slip the pads back in .. should give some space. If the pistons won't move then they are seized.
Do the prying carefully, you don't want to bend the rotor.

 

Thank you, I just went ahead an ordered another one on ebay cheap. I kinda tried what you suggested yesterday, only I think I made it worse. Because a scraping sound started happening to the rotor.

 

Best guess is hydraulic lock -- you bled the brakes; put the reservoir cap back on and then pressed the pads back to install the rear wheel. Pressing the pads back (in a closed system) created enough pressure to force the pads into the disc.

 

I wish that were the case, my brakes locked up when I moved my bike from one side of the garage to the other. I bleed the brakes to try and unlock it.

 

Its possible that one pad has become detached from its backing plate. Thus it jams when moved. I have only ever seen this once, but it exactly describes your problem. An very unusual issue

 

Thank you for the advice. I pulled the pads and they were okay. I found my wheel was out of alignment and I also had the spool that my rear motorcycle lift sits on screwed in too far, causing it to catch.

The good news out of all this, I learned how to replace my caliper, take it apart, how to manually push the piston back, also how to properly torque my rear axel bolt, align my rear tire, and tighten my chain. Lessons I'm not going to easily forget.

 

It sounds as though the fluid isn’t returning to the master cylinder. This usually happens with older brake hoses that have swollen from old, moisture-laden brake fluid. There is also potential that there is some crud in the line blocking the tiny return hole in the master cylinder or there could be corrosion in the caliper piston/bore. Good luck!

edit I just re-read one of your posts. It looks like you may have found the issue with the wheel pushed too far forward. What do you think was making contact?