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Brake Run-Out and Noise
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Author:  BKozan [ Fri Aug 15, 2014 4:09 pm ]
Post subject:  Brake Run-Out and Noise

I recently installed new rotors and pads up front on my Rover, and it was pretty sweet for about 20km. Now the passenger side is making a noise similar to a warped rotor (scrape, scrape, scrape scrape...) I had the brand new rotors machined before installing them.

What's really strange, is that the noise almost entirely disappears when I am turning right, and gets very loud when I am turning left. Of course I'm going to jump in and investigate (tomorrow), but anyone have an idea what could cause this asymmetric noise making?

-Brian

Author:  timmy201 [ Fri Aug 15, 2014 4:31 pm ]
Post subject:  Re: Brake Run-Out and Noise

Have you got the stone shields installed?

Author:  Mick [ Fri Aug 15, 2014 4:37 pm ]
Post subject:  Re: Brake Run-Out and Noise

To have it disappear around a corner means that the disc is moving in relation to the hub. It shouldn't really be making that noise at all if the discs have been machined back to true.

You need to check your CV nut tension. If the nut is up to tension, it could be play in the wheel bearings that is causing the disc to move in relation to the hub under load.

Your CV could be worn, as could your drive flange. A loose nut creates this wear, and thereafter no amount of tightening will repair it.

Author:  MiniBob [ Mon Aug 18, 2014 12:59 pm ]
Post subject:  Re: Brake Run-Out and Noise

Hi Brian, just wondering why you had brand new rotors machined ??

Author:  BKozan [ Mon Aug 18, 2014 2:47 pm ]
Post subject:  Re: Brake Run-Out and Noise

MiniBob wrote:
Hi Brian, just wondering why you had brand new rotors machined ??

Some people disagree, but I always have new rotors machined. Firstly it ensures they run true, and the scrape, scrape, scrape is something that drives me nuts so I avoid it at all costs. (Unfortunately it didn't work out for me this time.) Secondly, I believe it helps the pads bed in a bit quicker, without having to run them up to super temperatures. (EBC even recommends it).

I do however think I've solved the problems, thanks to my personal help line (AusMini).

Mick wrote:
You need to check your CV nut tension. If the nut is up to tension, it could be play in the wheel bearings that is causing the disc to move in relation to the hub under load.

How tight is too tight for this CV nut? Or is that impossible?

Because of the strife I went through removingthe thing, I probably didn't tighten it quite as much as I should have. Also, since I am using a meter long bar, i didn't want to lean on it too hard. So I am genuine about the question - How tight is too tight for that CV nut?

I took it all apart, re-tightend the ba-jeezus out of the CV nut, and then uniformly toqued the drive flange onto the disc. This solved the problem of noisy turning. Thanks Mick! Unfortunately, now it was simply making noise all the time. :x I went back through it and discovered that the new pins and clips I ordered were the culprit. I took a dremel to the inside edge of the clip, which had been rubbing against the rotor and whoila, happy days are here again.

Author:  Mick [ Mon Aug 18, 2014 3:01 pm ]
Post subject:  Re: Brake Run-Out and Noise

The torque settings are really important. The CV nut settings are 150 lb/ft for the Disc Brake CV nut.

Without a torque wrench, then as tight as you can with a meter long bar will come somewhere close to it.

Author:  Morris 1100 [ Mon Aug 18, 2014 3:01 pm ]
Post subject:  Re: Brake Run-Out and Noise

BKozan wrote:
MiniBob wrote:
Hi Brian, just wondering why you had brand new rotors machined ??

Some people disagree.

I disagree.

Author:  BKozan [ Mon Aug 18, 2014 3:44 pm ]
Post subject:  Re: Brake Run-Out and Noise

Morris 1100 wrote:
BKozan wrote:
MiniBob wrote:
Hi Brian, just wondering why you had brand new rotors machined ??

Some people disagree.

I disagree.

:lol: :lol: :D :D :o :o :o

Author:  9YaTaH [ Mon Aug 18, 2014 4:12 pm ]
Post subject:  Re: Brake Run-Out and Noise

Morris 1100 wrote:
I disagree.


Probably Mike, because you are disagreeable :shock: :P :arrow:

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