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chirpy chirpy cheep cheep...
https://www.ausmini.com/forums/viewtopic.php?f=2&t=37565		 Page 1 of 2
Author:  peter1 [ Fri Nov 09, 2007 2:54 pm ]
Post subject:  chirpy chirpy cheep cheep...
...or something like that. :roll: I've got a squeak in the RH front caliper (I think) and it's driving me ^%$%*&$ nuts :evil: . Have replaced wheel bearings, (plus all the front end bushes, tie rod ends etc), put high temp silicone behind the pads, cleaned the pads with a file (they have heaps of meat on them), had the discs machined, but still I get this damned squeaky chirpy noise just driving along at any speed. I think it goes away around LH corners, and the slightest touch of the brake pedal fixes it, or if not fixes it, at least changes the sound - so I'm thinking - do you think a change of pads would remedy it? If so - what pads are recommended for normal road use/bit of fast twisty stuff, and what should I be paying?
Another remedy I have found is to drive faster, as the noise is drowned out by engine/exhaust :roll: , (but the frequency of the chirping is relative to the road speed). Trouble with that is I need my licence!
Thanks, Peter. :)
Author:  AEG163job [ Fri Nov 09, 2007 4:31 pm ]
Post subject: 
I think the noise is caused by disc (rotor) "run out", or shimmy due to the way the disc & flange sits on the driveshaft spline. This could occur if you remove your discs for replacement, or bearing renewal and fail to instal the disc assembly in the original spot relative to the driveshaft splines.

If you have a dial guage, you can check for run out as you rotate the disc. But it is a PITA of a job (trial and error) as you have to keep removing & rotating the disc until you get it right, which means removing & tightening up the hub nut numerous times. Also, if your flanges are worn (inside splines or the inner boss which bears against the outer bearing) the problem might be hard to cure. I think the manual tells you the permissable tolerance for disc run out.
Author:  peter1 [ Fri Nov 09, 2007 5:10 pm ]
Post subject: 
mmmm, interesting and a possible cause. However, the noise started happening before we took the discs off and did the bearings etc - in fact, we did the bearings and disc machining etc to try and stop the noise, to no avail. The hubs were taken to a very good engineering shop and measured up and they built up some metal in there and machined them out so that the bearings and the spacer thingy between the inner and outer fitted perfect, so there shouldn't be any wear in there - anyway, like I said, the noise was there before all this was done......
:evil: onward we go.......
So you don't reckon new pads might cure it?
Author:  AEG163job [ Fri Nov 09, 2007 5:17 pm ]
Post subject: 
new pads worth a shot, but I'm pessimistic.

I would be tempted to undo the driveshaft nut & caliper and rotate the disc 90 degrees on the drive shaft and see if that cures/reduces it - rather than go thru the painstaking procedure I mentioned earlier..............
Make sure the nut is tightened fully.
Author:  Mike_Byron [ Fri Nov 09, 2007 6:09 pm ]
Post subject: 
I bet its the nylon cup the knuckle joint sits in. I bet that its run dry. Grease your suspension and see if you still have the problem.

Mike
Author:  peter1 [ Fri Nov 09, 2007 8:03 pm ]
Post subject: 
Thanks guys - although the suspension was only rebuilt quite recently, and greased etc I will check that out.
I think I'll start with new pads - what would you recommend - something a bit softer maybe too?
Peter.
Author:  sports850 [ Fri Nov 09, 2007 8:07 pm ]
Post subject: 
Just trying all the obscure things , do you have dust shields fitted and are the bolts etc on them tight ? The shield isn't bent a little and just touching the disc when it's spinning ?
Author:  Mini68 [ Fri Nov 09, 2007 8:11 pm ]
Post subject: 
I used to have a chirp noise too. Was cured by replacing worn drive flanges.
Author:  Morris 1100 [ Fri Nov 09, 2007 8:12 pm ]
Post subject: 
sports850 wrote:
Just trying all the obscure things , do you have dust shields fitted and are the bolts etc on them tight ? The shield isn't bent a little and just touching the disc when it's spinning ?
I once had a similar noise on my old XF Falcon. It was the powdercoat on the rear backing plate that was peeling off and touching the disc. :lol: It had me worried for a while!
Author:  drmini in aust [ Fri Nov 09, 2007 8:14 pm ]
Post subject: 
Mike_Byron wrote:
I bet its the nylon cup the knuckle joint sits in. I bet that its run dry. Grease your suspension and see if you still have the problem.

Mike

Mike, there is no lube hole in the top arm to the knuckle joint. All they get is what is in there when assembled.
The grease nipple just lubes the needle bearings in the top arm.

You can buy a grease needle, it has a nipple on the end. You spear a tiny hole in the knuckle joint boot, then pump a shot or so of lithium grease in. :wink:
Author:  peter1 [ Fri Nov 09, 2007 8:17 pm ]
Post subject: 
sports850 wrote:
Just trying all the obscure things , do you have dust shields fitted and are the bolts etc on them tight ? The shield isn't bent a little and just touching the disc when it's spinning ?

Nope, no dust shields, but good thinking.

Thanks for all the input guys - looks like it could be either of 2 or 3 things or a combination - process of elimination now I reckon!
Author:  Mike_Byron [ Fri Nov 09, 2007 8:35 pm ]
Post subject: 
drmini in aust wrote:
Mike_Byron wrote:
I bet its the nylon cup the knuckle joint sits in. I bet that its run dry. Grease your suspension and see if you still have the problem.

Mike

Mike, there is no lube hole in the top arm to the knuckle joint. All they get is what is in there when assembled.
The grease nipple just lubes the needle bearings in the top arm.

You can buy a grease needle, it has a nipple on the end. You spear a tiny hole in the knuckle joint boot, then pump a shot or so of lithium grease in. :wink:


Yes I realised afterwards that I had run two thoughts together - firtstly the knuckle joint cups had run dry and worn and then secondly the suspension was squeaking because it was also dry. Two separate thoughts that read as one.

Mike
Author:  DOZ [ Fri Nov 09, 2007 8:38 pm ]
Post subject: 
Tighten up the hub nut to the required torque setting then further till the spilt pin lines up.

Cured my funny noise anyway

Daniel
Author:  peter1 [ Mon Nov 19, 2007 6:15 pm ]
Post subject: 
FIXED! :D
New pads cured it - well, about 100ks since fitting and NO NOISE! The old pads were only 1/2 worn, but so far so good with the new ones.
Of course now that the chirping is fixed, I can hear another squeak, which sounds like a body squeak somewhere, but that's life :roll:
Peter.
Author:  1310/71 [ Mon Nov 19, 2007 6:38 pm ]
Post subject: 
peter1 wrote:
FIXED! :D
New pads cured it - well, about 100ks since fitting and NO NOISE! The old pads were only 1/2 worn, but so far so good with the new ones.
Of course now that the chirping is fixed, I can hear another squeak, which sounds like a body squeak somewhere, but that's life :roll:
Peter.


Phew,
I thought this was a name that song thread - eww wee.........
KB
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