car shaking on track under hard cornering. halp me lrn how 2 bleed breaks!
#21
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#22
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yeah its not bullshit if its a proven fact. https://vimeo.com/29409946
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#23
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yes I bled all 4 bleeder valves. I even tapped the caliper with a rubber hammer as suggested to convince any bubbles to come up. When I first put on my wilwoods and bled the brakes I took it out for a test drive, all excited about my new brakes only to turn right around and head back to shop the first time I felt them because they were so spongy. I was surprised that after bleeding a 2nd, then test drive, 3rd, then test drive, and even 4th bleeding attempt (yes back to front) that there was no air in the lines. I also tried a motive power bleeder to be 100%. I even got a new master, bench bled it, and bled every thing again with no improvement.
I don't know what I could be doing wrong but at this point I really don't care about weather I can lock up my brakes or not I'd really just like some suggestions on what this shaking could be. And if it was flat spotted tires I would feel it accelerating in a straight line also, which I do not. it is only under hard cornering.
I don't know what I could be doing wrong but at this point I really don't care about weather I can lock up my brakes or not I'd really just like some suggestions on what this shaking could be. And if it was flat spotted tires I would feel it accelerating in a straight line also, which I do not. it is only under hard cornering.
#24
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yes I bled all 4 bleeder valves. I even tapped the caliper with a rubber hammer as suggested to convince any bubbles to come up. When I first put on my wilwoods and bled the brakes I took it out for a test drive, all excited about my new brakes only to turn right around and head back to shop the first time I felt them because they were so spongy. I was surprised that after bleeding a 2nd, then test drive, 3rd, then test drive, and even 4th bleeding attempt (yes back to front) that there was no air in the lines. I also tried a motive power bleeder to be 100%. I even got a new master, bench bled it, and bled every thing again with no improvement.
I don't know what I could be doing wrong but at this point I really don't care about weather I can lock up my brakes or not I'd really just like some suggestions on what this shaking could be. And if it was flat spotted tires I would feel it accelerating in a straight line also, which I do not. it is only under hard cornering.
I don't know what I could be doing wrong but at this point I really don't care about weather I can lock up my brakes or not I'd really just like some suggestions on what this shaking could be. And if it was flat spotted tires I would feel it accelerating in a straight line also, which I do not. it is only under hard cornering.
if it was a blister or a flat spot you should be able to see it. so give it a look when you get the car up in the air. on one of our Ghetto miatas we race with nasa SE we had a really bad shimmy under hard turns. it was 100% in the steering wheel. you could feel it in the steering, car would really start shaking, and the car would push. turned out to be a bad rack. it was violent and the car would go into understeer city. but do check the hubs and ball joints. remember the weight needs to be off the suspension components to check the ball joints.
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#25
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if it was a blister or a flat spot you should be able to see it. so give it a look when you get the car up in the air. on one of our Ghetto miatas we race with nasa SE we had a really bad shimmy under hard turns. it was 100% in the steering wheel. you could feel it in the steering, car would really start shaking, and the car would push. turned out to be a bad rack. it was violent and the car would go into understeer city. but do check the hubs and ball joints. remember the weight needs to be off the suspension components to check the ball joints.
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#28
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I had a similar problem on left-hand turns, except it was accompanied by the tire rubbing against the spring. I thought the alignment had slipped, leading to excessive negative camber. Turns out it was the passenger-front wheel bearing. Jack up the front end and check for play by rocking the wheel/tire.
#30
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BTW - thanks for letting me know what company not to buy anymore parts from.
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#32
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__________________
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800.934.9112
703.430.3303
info@ogracing.com
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800.934.9112
703.430.3303
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#33
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wheel bearings are oem from the dealer and brand new. why dont you go ahead and read everything I've listed about trying to get these brakes to work and then tell me what I'm doing wrong? Because I've tried everything, no short cuts, and they still suck.
BTW - thanks for letting me know what company not to buy anymore parts from.![Thumbsdown](https://www.miataturbo.net/images/smilies/thumbsdown.gif)
BTW - thanks for letting me know what company not to buy anymore parts from.
![Thumbsdown](https://www.miataturbo.net/images/smilies/thumbsdown.gif)
If you are looking for a vendor who will politely tell you exactly what you want to hear, I would strongly advise that you look elsewhere.
#34
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dang, that's really unfortunate. I wonder what could cause such premature failure? I'll definitely check mine. I also had mine professionally installed - at an outrageous price none the less. $450 for installed rear wheel bearings, and helping me repack the front. I should have just bought blueprinted hubs with bearings already installed at that price.
#35
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i've had really great luck with Moog. i was using timkin because "made in Japan", that I would repack myself, and they would last 2 events. i got a Moog last time and didn't pack it. just installed it as it came. it's lasted 2 and a half years and still going. i'm sold on moog now, and also not repacking them myself :P.
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800.934.9112
703.430.3303
info@ogracing.com
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800.934.9112
703.430.3303
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#36
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I told you on Facebook a week ago (I'm Andrew Kidd). You haven't gotten the air out of the system yet. I understand you've bled them umpteen billion times, but the symptoms of your problem indicate that you still have air in the system. Could be technique errors, could be a stubborn air pocket, but it's certainly not your calipers as other vendors would have you believe. I have stood in your shoes (difficult air pockets after new install) so I speak from direct personal experience.
If you are looking for a vendor who will politely tell you exactly what you want to hear, I would strongly advise that you look elsewhere.
If you are looking for a vendor who will politely tell you exactly what you want to hear, I would strongly advise that you look elsewhere.
#38
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did you say wilwood?
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800.934.9112
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#40
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Any amount of play or lack of stiffness can cause a shimmy like that. Similar to wheel hop, but for the suspension. I would guess at the rear end, since it's more loaded under acceleration. Right hand corner puts load on the left side. Check control arm bushings, axle slop, wheel bearings, diff bushings, driveshaft slop, etc. It's still possible it's in the front, so check steering rack and linkages. Issues that cause a severe shimmy like that are usually identifiable by hand, if play in a component is the root cause. Aka, if your control arm bushing is causing it, you'll most likely be able to move it around by pushing hard on it.