Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: chrisgixer on 26 October 2013, 16:45:31

Title: Near side rear brake fluctuating...
Post by: chrisgixer on 26 October 2013, 16:45:31
...but not excessively.

I was going to look at this today but Spent too long pissing about with self levelling pumps before rain stopped play. ::)


Causes? :)


Must admit I thought it was the front discs, as it started when I fitted ebc front discs. But there's no clue through the steering, and the mot guy says its defo near side rear.
Title: Re: Near side rear brake fluctuating...
Post by: Seth on 26 October 2013, 16:54:16
Sounds like discs ...

Bit of a ball-ache maybe, try swopping 'em side-to-side and re-test perhaps?
Give the pad/caliper recesses a thorough clean too ...

Long shot ... air in system ... ? ???
Title: Re: Near side rear brake fluctuating...
Post by: 05omegav6 on 26 October 2013, 17:34:04
Any sign of the TC light :-\

Might be worth pulling the disc off and checking with a straight edge.... how old are the discs :-\
Title: Re: Near side rear brake fluctuating...
Post by: robson on 26 October 2013, 19:30:02
When I changed my back pads the pads were stuck to the caliper  maybe you have the same problem try to  take the pads out to check
Title: Re: Near side rear brake fluctuating...
Post by: chrisgixer on 26 October 2013, 22:16:32
Feels like an out of round or an out of true disc. Makes your head nod just as the car pulls up.

Bloody weather.

Title: Re: Near side rear brake fluctuating...
Post by: Andy H on 26 October 2013, 22:45:52
Feels like an out of round or an out of true disc. Makes your head nod just as the car pulls up.

Bloody weather.
you know what the problem is..........
Title: Re: Near side rear brake fluctuating...
Post by: chrisgixer on 26 October 2013, 22:52:04
Not yet. If the rain holds off I may be able to get at it and check.

Could be warped, or badly mounted, or badly made.

Or something else..? Hand brakes a bit high so I don't think that's binding. :-\

Title: Re: Near side rear brake fluctuating...
Post by: chrisgixer on 26 October 2013, 23:04:35
Actually ignore the hand brake thing, that would cause a constant judder. :-[ ::)
Title: Re: Near side rear brake fluctuating...
Post by: Andy B on 26 October 2013, 23:07:09
Do you have or have access to a DTI? Not wanting to teach Granny etc etc but you'd need to bolt the discs back on without the wheel to do the test though.
Title: Re: Near side rear brake fluctuating...
Post by: TheBoy on 27 October 2013, 09:38:55
As Andy B implies, try another pair of wheels at the back - we know Irmscher Sportstars are soft
Title: Re: Near side rear brake fluctuating...
Post by: chrisgixer on 27 October 2013, 09:50:18
As Andy B implies, try another pair of wheels at the back - we know Irmscher Sportstars are soft

Appologies to Andy I'm not sure what he means.


TB if it was the wheel, wouldn't it vibrate at speed...? And all the time? Not just when braking?
Title: Re: Near side rear brake fluctuating...
Post by: chrisgixer on 27 October 2013, 09:55:32
Are we talking measuring any run out with a gauge?

If so I sort of have a plan for that. :)
Title: Re: Near side rear brake fluctuating...
Post by: TheBoy on 27 October 2013, 09:56:45
As Andy B implies, try another pair of wheels at the back - we know Irmscher Sportstars are soft

Appologies to Andy I'm not sure what he means.


TB if it was the wheel, wouldn't it vibrate at speed...? And all the time? Not just when braking?
It can often be balanced out by a good fitter, so only shows up a very low speed. Had similar on a crappy old Nova I had, where the (steel) wheel was buckled, but round. Slowing from walking pace to stop, felt like the brake disc wasn't of a consistent thickness (what we often incorrectly call warped).

For time it takes to whack on another pair of wheels - even if its just the 2 spares out of your 2 Omegas just to test around teh block :)
Title: Re: Near side rear brake fluctuating...
Post by: Andy H on 27 October 2013, 10:00:19
Not yet. If the rain holds off I may be able to get at it and check.

Could be warped, or badly mounted, or badly made.

Or something else..? Hand brakes a bit high so I don't think that's binding. :-\
IIRC you drive yours every day so unlikely to be caused by rusting of the discs.

Following on from TBs suggestion - if it is an out of true wheel it may be that it is only noticeable at walking pace. When starting off you have other things to hold your attention which isn't the case as you slow to a stop,

Can you feel it if you try driving at 2-3mph?
Title: Re: Near side rear brake fluctuating...
Post by: TheBoy on 27 October 2013, 10:04:29
Has this happened since replacing tyres? Just thinking aloud if such a low profile (40s on your arse?) would be rigid enough that tyre imperfections could cause it to act like a buckled wheel?

Either way, a simple test to pop some other wheels on.
Title: Re: Near side rear brake fluctuating...
Post by: Andy B on 27 October 2013, 10:14:58
As Andy B implies, try another pair of wheels at the back - we know Irmscher Sportstars are soft

Did I?  :-\

I was suggesting to use a dial test indicator on the rear disc  ;)  ;)
Title: Re: Near side rear brake fluctuating...
Post by: Andy B on 27 October 2013, 10:15:39
As Andy B implies, try another pair of wheels at the back - we know Irmscher Sportstars are soft

Appologies to Andy I'm not sure what he means.


TB if it was the wheel, wouldn't it vibrate at speed...? And all the time? Not just when braking?

I think Jamie was confuddled  ;)  ;)  ;)
Title: Re: Near side rear brake fluctuating...
Post by: Andy B on 27 October 2013, 10:16:57
Are we talking measuring any run out with a gauge?

.....

Yes  :y
Title: Re: Near side rear brake fluctuating...
Post by: TheBoy on 27 October 2013, 10:25:52
As Andy B implies, try another pair of wheels at the back - we know Irmscher Sportstars are soft

Did I?  :-\

I was suggesting to use a dial test indicator on the rear disc  ;)  ;)
Ah, my bad, I was obviously paying my attention to my Marmite on toast, then your post  :-[

Either way, my comment stands :)
Title: Re: Near side rear brake fluctuating...
Post by: Andy B on 27 October 2013, 10:26:52
.....
Ah, my bad, I was obviously paying my attention to my Marmite on toast, then your post  :-[

 ;D ;D ;D

Either way, my comment stands :)

Obviously  :y
Title: Re: Near side rear brake fluctuating...
Post by: chrisgixer on 27 October 2013, 11:15:49
It's been there since.... Bit vague.... Iirc wheels and discs fitted. Over a year?

All tyres replaced since.

There was a vibration or balance issue at motorway speeds. But that's done been balanced out.

Spose I better pone a screw driver at hand brake adjusters while I'm there. Poxy things.
Title: Re: Near side rear brake fluctuating...
Post by: chrisgixer on 27 October 2013, 11:18:16
I should add I didn't bother investigating further as I was sure it was the used Ebc discs on the front causing it. Didn't expect them to last, but they are wearing well with no rust line.
Title: Re: Near side rear brake fluctuating...
Post by: chrisgixer on 02 November 2013, 19:14:05
Changed the front pads last weekend. Old ones where ok ish, but changed them before winter sets in.

...and its early days. But I'd swear the head nodding on the brakes has gone. ::)