August 16th, 2017, 02:07 PM | #1 |
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Name: C
Location: Houston Tx
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Front brake...brakes on it's own...
This is interesting. First mechanical issues, since I picked up the ninjette a few weeks ago. This started happening a day or two ago.
The front brake engages pressure on it's own. Both stationary, and riding. But it isn't all the time. I can park it after a quick ride, next day, front brake is locked up. Or, I can be doing a puttering ride, just to stroll around,.. Then it slowly engages on it's own. ( revs climb, bike slowly dives down. Front locked up. Other times, I come back to it, and the pressure is gone. I bled the brakes, first day recieving the bike, and has not been faulty, till recently. Going to do a full overhaul on the system. I have never experienced this situation, where it applies pressure ( and releases on it's own.) I find it interesting. I can understand items being frozen/locked. ( for ex:bike sitting for years) but not one that. Builds up , and releases on its own. |
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August 16th, 2017, 02:20 PM | #2 |
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Rubber hose is constricted.
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August 16th, 2017, 02:30 PM | #3 |
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I would look at the reservoir and master cylinder.
Check that the gasket is set properly in the cap on the reservoir so the diaphragm will expand and contract properly. It may get hot from the engine heat when parked, then not be able to expand without applying pressure. If that's not the issue, I would plan on a complete overhaul of both the master cylinder and caliper before riding. That situation could prove to be very dangerous. |
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August 16th, 2017, 02:35 PM | #4 |
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Jethro offers a good possibility.
Another possibility is a non-stock brake lever that's not letting the master cylinder's piston fully retract. That keeps the little hole covered so pressure can't get out of the line. It's very dangerous, and can lead to a locked front wheel at high speed. It doesn't take much warming up of the fluid to make it expand enough to get the brake dragging, which heats it up more, ending up with a locked wheel. It happened to a friend while riding his Buell the day after installing a non-stock brake lever. Alternatively, anything that's clogging that little hole, like dirt or corrosion, could do something similar. |
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August 16th, 2017, 03:18 PM | #5 |
Socially inept. Yet FUN!
Name: C
Location: Houston Tx
Join Date: Oct 2015 Motorcycle(s): Current machines- 1992 SECA II 600, 2006 Ninja 250, 2008 Ninja 250 Posts: 231
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Front brake...brakes on it's own...
This is interesting. First mechanical issues, since I picked up the ninjette a few weeks ago. This started happening a day or two ago.
The front brake engages pressure on it's own. Both stationary, and riding. But it isn't all the time. I can park it after a quick ride, next day, front brake is locked up. Or, I can be doing a puttering ride, just to stroll around,.. Then it slowly engages on it's on. ( revs climb, bike slowly dives down. Front locked up. Other times, I come back to it, and the pressure is gone. I bled the brakes, first day recieving the bike, and has not been faulty, till recently. Going to do a full overhaul on the system. I have never experienced this situation, where it applies pressure ( and releases on it's own.) I find it interesting. I can understand items being frozen/locked. ( for ex:bike sitting for years) but not one that. Builds up , and releases on its own. |
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August 16th, 2017, 03:24 PM | #6 |
Socially inept. Yet FUN!
Name: C
Location: Houston Tx
Join Date: Oct 2015 Motorcycle(s): Current machines- 1992 SECA II 600, 2006 Ninja 250, 2008 Ninja 250 Posts: 231
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I have extra levers, and reseviors. I'll see if the one equipped is stock (it's mounted on the adjustable knob for hand size)
I figured it stems from my actuation of the brake, and becomes a delayed/stored energy issue. Thanks for replys. Yup, if I am going to check several areas, worth doing a full overhaul/rebuild. |
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August 16th, 2017, 07:29 PM | #7 |
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Testing my memory here, but I seem to recall, long ago, an acquaintance having a similar issue due to his inattentive use of incompatible brake fluids. Other than that, I just can't remember the gritty details.
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August 17th, 2017, 06:28 AM | #8 |
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This brake issue, its cause & solution has been dealt with before on this (and other) forums but I haven't been able to find it yet though if my rusty memory is correct; the answer is above. I'll keep looking and see if there's anything different than what's been suggested.
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August 17th, 2017, 11:00 AM | #9 | |||
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I would first so a service of the caliper, which includes flush and fill with fresh fluid
Here's the write-up. I recommend that every time you change your pads, you service the calipers, he's my write-up to help you out. It should fix your initial problem, and keep your calipers in top working order. Quote:
I also recommend flush and fill with new brake fluid, also I'd go with 5.1DOT. No matter what kind of brake fluid you choose, always periodically flush and fill with new fluid. This is the one I use https://m.motul.com/ca/en-us/product...-1-brake-fluid Also inspect the brake lines, replace is needed, http://faq.ninja250.org/wiki/Stainle..._lines_upgrade Quote:
On my 91 EX500 I have Spiegler, in orange to match that bike. Quote:
Buy quality pads,I personally recommend EBC brand either the HH, or the Extreme HH. EBC full floating rotor, replace the OEM rubber line with a stainless steel braided brake line, cheaper than replacing them with OEM. On my 500 I have Spiegler line http://www.spieglerusa.com/brakes/cy...line-kits.html On my Ninja 250 i went with Venhill http://www.venhillusa.com/products.html With all that, it will stop on a dime, and leave you nine cents in change. look here http://ebcbrakes.com/products/motorcycle/ And also read this, http://www.ex-500.com/wiki/index.php...otors_and_Pads That should answer any questions you might have.
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August 17th, 2017, 12:08 PM | #10 |
Socially inept. Yet FUN!
Name: C
Location: Houston Tx
Join Date: Oct 2015 Motorcycle(s): Current machines- 1992 SECA II 600, 2006 Ninja 250, 2008 Ninja 250 Posts: 231
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Thanks for all the info.
Long story short, I got it working again. Once when I saw how corroded everything was, I cleaned up what was usable, (caliper, pistons, resevior) replaced what was not (o-rings, hoses, rubber goods) with new. Again, thanks for the input. Super slueths have closed another case.. |
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August 17th, 2017, 12:41 PM | #11 |
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Good work, C.
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August 29th, 2017, 06:59 AM | #12 |
The Corner Whisperer
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Heated water expands, cooling water contracts... which explains your intermittent brake pressure problem. (water is a funny substance, it doesn't act like other liquids 100% of the time. it has a goldylocks temp zone)
So how did the full brake service go? I assume you got it fixed by now.
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August 29th, 2017, 07:29 AM | #13 |
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Gremlins.....
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August 29th, 2017, 07:30 AM | #14 |
Guy Who Enjoys Riding
Name: Jim
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The bleed hole in master cylinder reservoir may be blocked, preventing pressure in the system from being able to get out. This is very dangerous. I've seen it cause a locked front wheel at high speed, with the resulting crash.
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August 29th, 2017, 08:02 AM | #15 |
Rev Limiter
Name: Jay
Location: WI
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August 29th, 2017, 08:28 AM | #16 |
Guy Who Enjoys Riding
Name: Jim
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Good question Jay. I assumed this was a different case, but I didn't check.
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August 29th, 2017, 08:47 AM | #17 | |
The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
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Quote:
Sorry...
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August 29th, 2017, 08:51 AM | #18 |
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/merged
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August 29th, 2017, 08:56 AM | #19 |
Rev Limiter
Name: Jay
Location: WI
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More Gremlins at work...
Thanks Alex. |
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September 13th, 2017, 05:40 PM | #20 |
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Name: Kevin
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I just bought my 250r and it was wrecked when I bought it. It still starts, runs, and rides but on a sharp left turn it locks the front wheel. My initial thought was that the lever was hitting the mirror which was completely bent around backwards and o still think that's the case but I haven't had it running yet since I took all that off. I'm hoping it was that simple.
The lever is bent a little too so I'm not too sure it's not that. |
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September 13th, 2017, 06:31 PM | #21 |
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Also make sure brake-lines aren't routed in some weird way that causes them to be tightened when bars are turned. That will squeeze brakes too.
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