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Discussion Starter · #1 ·
I recently installed an accutronix kit. Everything was working fine, except my rear brake was a teeny bit spongy. I did take the bike on a 300mi road trip and evreything worked just fine.

Anyway, (after the trip) last week I decided to firm the brake up one more time with a good brake bleed.I was very pleased with the result; I got it firmed up just as firm as the stock pedal. I used a different brand of fluid though... (I originally used a valvoline DOT4 synth, but used another type when I bled the second time. I bled all the way through though, so there should be little remaining of the original valvoline fluid if that makes sense)


The problem:
I just pulled into work. I noticed the bike was dragging going up the hill to my office, anyway, after I turned, I almost dumped the bike when I pulled in the clutch because it began to stop... fast! I hobbled it into a spot and stopped. The Pedal is now VERY VERY firm, no play in it at all. I could smell that "riding the brake" smell. I stopped short of licking it to check it's temperature, but it was definitely hot.

sooo... I'm at work. What should I check?
 

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if you used a different brake fluid you may have damaged the seals and caused a hydrualic lock. not all fluids are compatable. its just a hunch though, you could hhave a mechanical failure...
 

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Discussion Starter · #3 ·
The valvoline said "compatible with all dot4 systems" thats why I figured it was safe...

I did have to ride it through a ton of rain on friday. I got caught in a torrential downpour.
 

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Mixing DOT3 and DOT4 is generally going to be OK, DOT5 is totally incompatible. Still, even if that was the case, you're not going to see what you're seeing right now. Incompatibilities will cause corrosion, but not in like, a few days :)

Possibilities include:
Mechanical problem -- Something's stuck in the pedal, I haven't looked at my 1300 but there may be an adjustment to how the pedal sits (I know there is on my VLX), and that may have gotten messed up. These are things that may be entirely unrelated to the hydraulics part and it's just coincidence it happened around the time of a brake bleed.

Something (exhaust?) seriously heating a brake line. Brake fluid will expand under heat. Previously, after installing the kit, you had a bit of air in your lines, which was able to be compressed when the line heated up. Now the fluid expands and it's got nowhere to go but pushing the pistons. This puts even more heat into the system from friction.

Hrm, can't think of anything else right now..
 

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Discussion Starter · #5 ·
jimduchek said:
Mixing DOT3 and DOT4 is generally going to be OK, DOT5 is totally incompatible. Still, even if that was the case, you're not going to see what you're seeing right now. Incompatibilities will cause corrosion, but not in like, a few days :)

Possibilities include:
Mechanical problem -- Something's stuck in the pedal, I haven't looked at my 1300 but there may be an adjustment to how the pedal sits (I know there is on my VLX), and that may have gotten messed up. These are things that may be entirely unrelated to the hydraulics part and it's just coincidence it happened around the time of a brake bleed.

Something (exhaust?) seriously heating a brake line. Brake fluid will expand under heat. Previously, after installing the kit, you had a bit of air in your lines, which was able to be compressed when the line heated up. Now the fluid expands and it's got nowhere to go but pushing the pistons. This puts even more heat into the system from friction.

Hrm, can't think of anything else right now..

If it's the heat, then it should unlock itself after it cools down. (right?)

The mechanical problem seems like a possiblity. I don't remember tightening the screw on the shaft for the MC plunger. If that somehow moved backwards and extended the throw, the MC would be under pressure all the time.

I'm praying and crossing my fingers it the second one. That would be an easy fix
 

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Sounds like you've still got some air in the line. When air heats up, it will expand a lot more than fluid will. Just try cracking your bleeder valve and see if any air comes out. Relieving the pressure should free up the brakes.

Good luck,

-Dave
 

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Discussion Starter · #7 ·
well I just went out there and checked it. The nut that holds the shaft adjustment for the master cylinder was all the way forward (It should be all the way back). The may have caused the shaft to 'adjust' itself. It looked like

I unscrewed the shaft a few turns and tightened the nut with my fingers. Now I can lift the pedal a tiny bit before it falls...

Any other ideas? It's monday, the shop it closed :( gonna have to fix this myself
 

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Discussion Starter · #8 ·
I also pushed down on the pedal as hard as I could several times. I finger checked all the hose connections that I had messed with and they were bone dry... so no leaks! (I hope)
 

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Hopefully that adjustment did the trick. If it's still locked up, crack the bleeder valve and drain most of the fluid out... assuming it's not something really nasty with the pistons being stuck or something, you'll end up with a no rear brake, but it'll be ridable. Who needs it, anyway? ;) Ride safe and careful and get her home to figure out ...

Jim
 

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Discussion Starter · #10 ·
Well after I fixed the nut... I went to an old casino parking lot in North KC and rode the brake for a bit. I stopped when I caught a hint of 'asshole riding the brake' smell.

I took off my glove and held it near the brake and it was definitely smokin hot. I tried touching the banjo bolt, and that was very hot as well.

Anyway, I proceeded to accelerate and pull in the clutch. The bike drifted just fine. I stopped and rolled it back and forth. Everything seems to be working just fine.

Rode home with no problems! I think i found the culprit. I'm gonna locktite that shit.
 

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Discussion Starter · #11 ·
Happened again and the nut is still where it should be. The pedal got extremely firm and the brake was slowly starting to lock. Definitely sounds like water boiling in the lines, because twice, it has only occured during the hottest part of the day when I was riding hard.

There was no water near me when I bled these things. The fluid came from a sealed bottle... But i'm thinking I got some shoddy break fluid. I'm going to bled the shit out of it on thursday and put the Valvoline Synthetic back in.

Any other suggestions would be helpful, but i think i've located the problem
 
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