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Do you know what really grinds my gears? No, tell us, we really want to know!

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Old 21-04-2012, 10:42 AM   #1
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Angry Possibly throwing away 150

Ordered some CRN grooved front discs as I received an advisory for excessive vibration under braking on my MOT and I was told the discs might be warped. Since then I've been looking for information on which way to fit them, i.e / or \ and it appears that \ is the "correct" way as it's less "aggressive" than /.

So no prizes for guessing which way my current discs are fitted. Yep, /. So the vibration could simply be cured by changing my / to \ and the discs might be fine.

Guess I should have done some research before reaching for my wallet.
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Old 21-04-2012, 10:46 AM   #2
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Yeah but that wouldn't cause the wheel to wobble when breaking
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Old 21-04-2012, 10:51 AM   #3
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Originally Posted by Tillysrb25 View Post
Yeah but that wouldn't cause the wheel to wobble when breaking
It's not the wheel that wobbles, it's just very bad vibration through the brake pedal. I guess it's better to be safe than sorry though.

Just been reading through this guide to brake vibration and the myth of warped discs,

http://www.powerbrake.co.za/download..._01_judder.pdf

and, given the state the rest of the car was in when I bought it, I can well believe that the discs and pads were not properly bedded in after being fitted.
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Old 21-04-2012, 10:54 AM   #4
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If the peddle is moving up and down under breaking then i'd be inclinded to do disc and pad change anyway. somethings warped
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Old 21-04-2012, 11:03 AM   #5
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If the peddle is moving up and down under breaking then i'd be inclinded to do disc and pad change anyway. somethings warped
That's the plan now. I might swap the o/s and n/s discs before fitting the new ones just to check my theory about rotation direction though.
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Old 21-04-2012, 11:04 AM   #6
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Split tie rod bushes can cause wheel wobble, as can split track rod ends..
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Old 21-04-2012, 11:10 AM   #7
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Split tie rod bushes can cause wheel wobble, as can split track rod ends..
I'm inclined to think that in this case it's just the discs/pads as the MOT test didn't pick up any problems with the front bushes or track rods. Thank God!
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Old 21-04-2012, 11:41 AM   #8
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I dont understand how that can show up on a normal MOT. They only check for visible brake condition and braking force/balance as a percentage. Am I missing something, could someone explain how this can fail a Mot?
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Old 21-04-2012, 11:49 AM   #9
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If they are warped cant you just have them skimmed?
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Old 21-04-2012, 11:53 AM   #10
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I dont understand how that can show up on a normal MOT. They only check for visible brake condition and braking force/balance as a percentage. Am I missing something, could someone explain how this can fail a Mot?
According to the MOT manual (3.7.b.1c)

http://www.ukmot.com/3-7.asp

b. Evidence of severe brake grabbing or judder as the brake is applied.
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Old 21-04-2012, 04:37 PM   #11
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Quote:
Originally Posted by Kashmir View Post
I've been looking for information on which way to fit them, i.e / or \ and it appears that \ is the "correct" way as it's less "aggressive" than /.

So no prizes for guessing which way my current discs are fitted. Yep, /. So the vibration could simply be cured by changing my / to \ and the discs might be fine.
Probably best to read this first mate before deciding that \ is correct and not / :-

https://www.skylineowners.com/forum/s...ighlight=vanes
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Old 21-04-2012, 04:42 PM   #12
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How would you test for that on a car with ABS? don't ABS breaking systems cause the peddle to 'judder'?
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Old 21-04-2012, 08:40 PM   #13
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How would you test for that on a car with ABS? don't ABS breaking systems cause the peddle to 'judder'?
abs only works when all 4 wheels are rotating and the roller brake tester doesnt activate the abs
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