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I love that you can't bleed brakes without the special computer. Fuckin cars man.
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Sep 3, 2015 02:20
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Technically that's true on almost anything with ABS. However as long as you are careful and the system didn't run completely dry (aka air didn't make it to the ABS HCU while you were working on the brakes) you can usually bleed the normal way and forget all about it. All the computer generally does is cycle the ABS solenoid valves in an abnormal way so you can bleed the air out of the ABS HCU.
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Sep 3, 2015 02:23
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tater_salad posted:I love that you can't bleed brakes without the special computer. Fuckin cars man. Its pretty well the only way to do it properly on any car with ABS and/or Traction Control. There are a bunch of solenoid valves and at least 1 gear pump/motorised piston actuator that helps do all the magic brake trickery, and any air in those places can cause bad things(TM)
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Sep 3, 2015 11:44
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Great I guess I'm the mechanic failure. When I'm done doing brakes on my cars I always bleed a bit and look for air in the mitivac line to make sure I didn't introduce air into the system.
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Sep 3, 2015 12:35
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tater_salad posted:Great I guess I'm the mechanic failure. When I'm done doing brakes on my cars I always bleed a bit and look for air in the mitivac line to make sure I didn't introduce air into the system. It's more of an issue if you have to replace lines, hoses, or something like the master cylinder. Just regular bleeding shouldn't introduce air, unless you let the MC go dry.
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Sep 3, 2015 13:23
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kastein posted:Technically that's true on almost anything with ABS. However as long as you are careful and the system didn't run completely dry (aka air didn't make it to the ABS HCU while you were working on the brakes) you can usually bleed the normal way and forget all about it. And when you have drained enough that the ABS has air in it, you bleed, bleed, bleed (preferably power bleeder) then go out in the grass and lock 'em up a bunch of times, come back and bleed more. One or two cycles of that usually takes care of it. Yeah, having the right cable/software makes things a lot easier.
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Sep 3, 2015 14:14
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Is there a reason why ABS units cannot have bleed nipples fitted at the factory other than $cost$ ?
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Sep 3, 2015 14:37
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ShittyPostmakerPro posted:Is there a reason why ABS units cannot have bleed nipples fitted at the factory other than $cost$ ? Some of them do. And I've found you still need to run the bleed procedure or go out sliding around.
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Sep 3, 2015 14:41
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You could, but you would need to put them in all the sections of plumbing in there that are blocked off during use. That gets prohibitive pretty quickly, for example by my count you would need four on even an old WJ with only 3 ABS circuits and no ESC/ETC. And that still gives no way to bleed the pump itself. Add another channel and more capabilities and the number goes up. Here's a hydraulic diagram and writeup for the simplest ABS I can think of used anytime in the last 14 years: http://www.aa1car.com/library/abs_teves_mk20.htm
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Sep 3, 2015 15:07
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gently caress that web page for trying to block right clicks with javascript.
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Sep 3, 2015 15:09
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xzzy posted:gently caress that web page for trying to block right clicks with javascript. Javascript turned off by default, sure it makes the initial visits to a new website a hassle but it cockblocks that bullshit right away. So would this whole ABS bleeding stuff possibly be why I could never get the brakes right on the old volvo I had as a teenager after the brakes overheated? It was a mid 80's model, no idea if it actually had ABS or not. Worked with my uncle and replaced the MC, new fluid and bled that sucker half a dozen times and they never worked right.
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Sep 3, 2015 16:02
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My car has ABS built into the master, and has 3 bleed nipples for the whole thing. I'm pretty sure that's all I need to bleed. But the master cylinder unit is a huge pile of mystery and doesn't resemble a modern ABS unit at all, so who knows
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Sep 3, 2015 16:51
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We were having braking problems on our time attack car at one event and figured there was some air in the abs. So I drove it around on the grass near the pits and did a bunch of sliding abs stops. Then we re-bled and the brakes worked great after that.
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Sep 3, 2015 18:12
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It's not broken in this picture but went oozing for something and got sidelined and I don't even know any more. It's a VAG product. 
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Sep 3, 2015 23:16
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 WHEN IN DOUBT, ADD AN L FOR FUCKS SAKE  gently caress. Somebody fucked around with this message at 00:48 on Sep 4, 2015 |
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Sep 3, 2015 23:33
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Splizwarf posted:
quoting to see what the gently caress
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Sep 3, 2015 23:34
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I think the problem are the ghosts in that image
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Sep 3, 2015 23:49
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Raluek posted:quoting to see what the gently caress It's part of the wiring for the glow plug on a Wärtsilä RT-flex96C, right? I know it doesn't
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Sep 3, 2015 23:59
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Whatever it is, it's a very large failure. Looks like an ignition coil pack with a split in the boot?
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Sep 4, 2015 00:02
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Not too many people post images that blow things up on my 4k screen, 
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Sep 4, 2015 00:42
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Splizwarf posted:
Just when I was considering a volvo.
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Sep 4, 2015 00:48
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Sep 4, 2015 02:18
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gently caress YOU TRAIN, I QUIT.
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Sep 4, 2015 02:26
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 Well poo poo son.
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Sep 4, 2015 03:14
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The oil splatter on the wall is so Ralph Steedman.
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Sep 4, 2015 03:20
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Cloudy with a chance of fragged locomotive piston? Holy gently caress.... 
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Sep 4, 2015 04:33
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What's that? INCOMING BOGIES SIR GET DOWN  Source: British Rail, of course. http://www.railengineer.uk/2015/03/31/finding-the-real-causes/ The bearing and axle had nearly a million miles on them and the bearing seized, spun, and heated the end of the axle until it lost strength and failed. That was a terrible pun and I regret nothing 
kastein fucked around with this message at 04:44 on Sep 4, 2015 |
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Sep 4, 2015 04:40
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For a minute I thought the failure was that hosed up roof design on the porch.
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Sep 4, 2015 04:54
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My reaction was literally when I realized what I was looking at (I also thought it was some hosed up roof design at first).
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Sep 4, 2015 04:55
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Sorry, my bad. Phoneposted from the scene of the crime. Looked good in Awful App. 
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Sep 4, 2015 14:19
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Splizwarf posted:Sorry, my bad. Phoneposted from the scene of the crime. Looked good in Awful App.
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Sep 4, 2015 23:54
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That one is a classic and is metal as gently caress.
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Sep 5, 2015 00:56
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There was a power station in South Africa that was doing a turbine overspeed test. Basically they pushed the turbine into overspeed on purpose, there were three systems that would automatically regulate or shut the system down, and a person ready at an e-stop button to kill the test if things went sideways. In ten seconds the turbine goes from 3000 RPM to 4500 RPM, 150% of rated speed. (It should never exceed about 3450 RPM, or 115%). All three systems failed, and the guy who was supposed to press the emergency stop if things went sideways did not press the emergency stop. (Reports say he wasn't even where he was supposed to be.) Things went very, very sideways. https://nolstuijt.wordpress.com/2011/11/27/duvha-powerstation-turbine-blowup-sa/ Things that were trashed:
If you search for "Duvha power station" there are more pictures of the chaos.
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Sep 6, 2015 21:14
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Whose drat idea was it to overspeed a multi million dollar piece of equipment to 150 percent, without the man at his post? The chain of events that lead to this is mind blowing. Horrible idea for a test, failed safety system, and the drat dead mans switch guy wasn't near it. drat.
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Sep 7, 2015 01:56
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Yeah seriously. Let's have a test of a safety system, by doing the most unsafe thing possible! What could possibly go wrong!
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Sep 7, 2015 02:06
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rainwulf posted:and the drat dead mans switch guy wasn't near it. drat. And wasn't there some, like, power plant or something in Ukraine that did basically the same thing except it turned out worse? 
Friar Zucchini fucked around with this message at 02:11 on Sep 7, 2015 |
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Sep 7, 2015 02:06
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rainwulf posted:Whose drat idea was it to overspeed a multi million dollar piece of equipment to 150 percent, without the man at his post? The chain of events that lead to this is mind blowing. Chernobyl would like to remind you that it was largely a mixture of known defects and bad management. Friar Zucchini posted:And wasn't there some, like, power plant or something in Ukraine that did basically the same thing except it turned out worse? If you are talking about Chernobyl: Yes. It wasn't entirely an issue with the positive void coefficient, but a failure of proper control over the test sequence being carried out on the reactor.
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Sep 7, 2015 02:28
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CommieGIR posted:If you are talking about Chernobyl: Yes. It wasn't entirely an issue with the positive void coefficient, but a failure of proper control over the test sequence being carried out on the reactor. Probably 15ish years ago I read a translated Russian book about the Chernobyl accident and yeah, this. IIRC, after thoroughly dissecting all the technical aspects of the accident and the deficiencies of the RBMK reactor design, the author put most of the blame on human factors. Despite all the problems with the reactor's design, he felt the test could have been run without causing an accident if the Soviet system hadn't populated the administrative structure of nuclear power with nepotistic picks who weren't given enough training.
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Sep 7, 2015 02:57
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BobHoward posted:Probably 15ish years ago I read a translated Russian book about the Chernobyl accident and yeah, this. IIRC, after thoroughly dissecting all the technical aspects of the accident and the deficiencies of the RBMK reactor design, the author put most of the blame on human factors. Despite all the problems with the reactor's design, he felt the test could have been run without causing an accident if the Soviet system hadn't populated the administrative structure of nuclear power with nepotistic picks who weren't given enough training. Yeah, the RBMK is still in service, althought most of them have been fixed, but the plant had operated fine through multiple similar tests, except this time they basically started the test and then totally forgot it was going on, and the test continued to run over a shift change and no proper control was passed to the new shift.
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Sep 7, 2015 03:30
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Oh, yeah could be that, but the first thing that reminded me of was Sayano–Shushenskaya Dam turbine failure I'm not gonna repost the pics here again but it was pretty severe to say the least.
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Sep 7, 2015 06:08
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