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bladesamurai posted:I noticed low pressure in my rear brake pedal a few weeks ago, so I bled the system of air. Got a lot of bubbles out, the fluid was clear, and the pedal was rock solid. I topped off the reservoir and assumed it was fine. However here we are, 2 or so weeks later, and the pedal goes all the way to the stop again. This is indicative of a leak of some sort, no? I don't see any obvious fluid anywhere so I'm not sure where to start looking or how to start troubleshooting. Any ideas? A tube leak would probably be obvious. If you don't notice fluid spraying around it's probably burning off at your discs. It might be caliber rebuild time. Some pictures might help diagnosing this. Also some information about what you ride might be helpful. I don't like this: "so I bled the system of air". You'll never have to do such a thing, unless you're changing fluid. There's no physical way for air to enter your system unless something is seriously wrong. Of cause there's also the possibility that your initial bleeding skills sucked, your fluid was water contaminated or you mixed dino fluids with silicone (beware of DOT5 in a 3, 4 0r 5.1 system). More information and a couple of pictures, and we can probably get you safe on the road again.
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Jul 11, 2011 23:28
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| # ¿ Apr 24, 2024 18:26 |
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clutchpuck posted:Bleeding bubbles is actually routine but it [as you say] shouldn't be actual air. Brake fluid typically boils a little with use and releases bubbles of vapor into the system which, like air, will compress and compromise the system's ability to create proper pressure before you press the lever/pedal to the stop.. Pretty much correct if you run DOT3 or 4. DOT5 or 5.1 won't absorb much air moisture. To routinely bleed your brakes shouldn't be necessary at all.
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Jul 12, 2011 01:01
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bladesamurai posted:The bike is an 04 sv650 with around 14k on it, new to me this season, I've put 4k on it. Brake lines are original as far as I can tell, so it might be time for replacement. I would be really surprised if the brake lines on that bike leaks. They should be good for at least 30K on that bike, and even then they won't leak, just lose a bit of stiffness. bladesamurai posted:When I first noticed the brake feeling spongy and bled the system, the reservoir wasn't noticeably low until i started pumping fluid out of the bleed nipple on the back. Of course, then I had to refill it. The pedal had excellent feel at this point, I noticed no leaks, and I figured all was well. Exactly how low was your reservoir when you noticed it was. Can you describe your bleeding technique. I'd be really amazed by serious brake failures on a 04 SV650 with less than 30K on it. I'd be really interested in a picture of your disc and pads. bladesamurai posted:I used DOT4 as required by the plates on the reservoirs. If a previous owner had used the incorrect DOT# brake fluid, the brake fluid coming out of the caliper would show this, right? Not really. Brake fluid come in a rainbow of colors. It's quite possible that the previous owner changed to DOT5 and didn't know how to handle a effective flush before he did so. If I was you I'd buy a big can of DOT 5.1 and seriously flush your system clean before anything else. And, oh yes, even though the plates on your reservoirs states DOT4, you should upgrade to DOT5.1 Still, I'm a bit worried about your bleeding technique. Please describe it in details. bladesamurai posted:I'll grab some pictures tomorrow when I get home from work. If you ride to work, I seriously loving hope your front brakes don't have anything like this problem.
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Jul 12, 2011 12:34
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Crayvex posted:Am I being unreasonable? No, it definitely doesn't run alright. I've got lovely sound on the netbook I'm at right now, but to me it sounds like it's not running on all cylinders, at least not in low RPMs. Does all exhaust pipes get close to equally warm? (You can test this with a wet rag or the tail of a small dog you don't care much about) Could you get your hands on a cheap compression tester and post the values both warm and cold. How are the spark plug colors? Can you post a few pictures of them?
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Jul 12, 2011 14:44
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bladesamurai posted:The reservoir still had some fluid in it when I started the bleeding process, I haven't looked at it yet for this most recent problem yet. I'll crack it open before I do anything, next. And I'll look into switching over to 5.1. You can't bleed brakes with a closed reservoir. Top it up as you bleed the brakes. If it runs dry there's a pretty good chance that you hosed up. bladesamurai posted:Loosen the rear bleed nipple nut until I can move it with my fingers, slip some vinyl tubing over it. Clear aquarium tube is unbeatable. You should also use a small ring-wrench on the nipple below the clear tube. While you bleed the system, there's only two nipple-settings: totally closed while building up pressure and slightly open while you vent air and fluid out. During the bleeding the tube should be totally filled with fluid. Trim the length of the tube to reach a jar filled with water. The other end of the tube should always be under waterlevel in the jar. Tape it to the rim of the jar. Watch the tube near the nipple. Keep bleeding the fucker till you see only totally clean fluid. Then take a pause. Close the nipple and beat your caliber, and hoses a bit with a Persuadertron (TM) (reasonable piece of wood). Repeat. bladesamurai posted:Is there anything I should be taking a picture of, aside from everything? Since you're kind enough to ask, actually yes. I would very much appreciate a picture of a penguin with a silly hat. Thanks in advance. Giraffe of pain fucked around with this message at 18:37 on Jul 12, 2011 |
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Jul 12, 2011 18:06
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Z3n posted:
That's a CBX specialist tool for adjusting vents on 3 and 4. I don't think the public is even allowed to own one.
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Jul 12, 2011 20:47
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Z3n posted:You're really bad at this. But we love you for it anyways Well, at least I always try to rescue a new motogoon from road rash before I go down in a blaze of glory.
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Jul 12, 2011 21:29
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KARMA! posted:No, Don't! you're ruining it for everyone! Don't blame Z3n. Blame that loving CBX. It's cursed. Spiders are a lot nicer.
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Jul 12, 2011 21:39
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O- and X-ring chains shouldn't be lubed too much. They're much happier just being clean.
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Jul 12, 2011 22:02
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| # ¿ Apr 24, 2024 18:26 |
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Phy posted:Is there any safe way to work the foam shell out of a helmet? I want to replace one of the top vents on my HJC CL-15 and it's screwed on, and the boneheads covered the screw head with crash protection. Patience will work. I've done it on mine, and it's not very hard to loosen the padding just with your hands.
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Jul 16, 2011 12:00
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