Andrew

Any suggestion for the cause of this seen as my dealer claim they are unable
to reproduce?

Audi A3 (2003) - after about 10 minutes of driving one of the wheels starts
to give a metalic squeeling sound intermittantly up to about 30mph. When
applying the brakes of any pressure the sound disappears. If (when
stationary) I press really hard on the brakes the intermittant squeeling
sound seems to disappear for a bit longer. Occurs regardless of
weather/temperature.

Not long has its MOT and nothing reported there. Had a service at an Audi
dealer who said they were unable to reproduce, but couldn't see any problems
with the wheel/brakes and suggested its probably dirt so pressure washed the
wheel. Made no difference at all.

No warning lights on the dash to indicate low brake pads etc - car doesn't
feel any different to drive and brakes still stop the car as good as ever!

Any suggestions to fix this?

Thanks,
Andy

daytripper

On Wed, 16 Jan 2008 18:03:53 -0000, "Andrew" <nospam@nospam.com> wrote:

>Any suggestion for the cause of this seen as my dealer claim they are unable
>to reproduce?
>
>Audi A3 (2003) - after about 10 minutes of driving one of the wheels starts
>to give a metalic squeeling sound intermittantly up to about 30mph. When
>applying the brakes of any pressure the sound disappears. If (when
>stationary) I press really hard on the brakes the intermittant squeeling
>sound seems to disappear for a bit longer. Occurs regardless of
>weather/temperature.
>
>Not long has its MOT and nothing reported there. Had a service at an Audi
>dealer who said they were unable to reproduce, but couldn't see any problems
>with the wheel/brakes and suggested its probably dirt so pressure washed the
>wheel. Made no difference at all.
>
>No warning lights on the dash to indicate low brake pads etc - car doesn't
>feel any different to drive and brakes still stop the car as good as ever!
>
>Any suggestions to fix this?
>
>Thanks,
>Andy

Could be a bad caliper (or, a caliper gunked up with corrosion and road crap),
could be air in the brake line to the offending corner...I suppose even a
balky master cylinder might cause something like this.

/daytripper
'00 s4 6spd

Frank

daytripper knastet inn: :
> On Wed, 16 Jan 2008 18:03:53 -0000, "Andrew" <nospam@nospam.com> wrote:

>> Audi A3 (2003) - after about 10 minutes of driving one of the wheels starts
>> to give a metalic squeeling sound intermittantly up to about 30mph. When
>> applying the brakes of any pressure the sound disappears. If (when
>> stationary) I press really hard on the brakes the intermittant squeeling
>> sound seems to disappear for a bit longer. Occurs regardless of
>> weather/temperature.

> Could be a bad caliper (or, a caliper gunked up with corrosion and road crap),
> could be air in the brake line to the offending corner...I suppose even a
> balky master cylinder might cause something like this.

My guess, air or [too much] water in the break line. Bleed all caliphers,
back wheels first, until brake fluid is clean/new (why not, change all
of it). In any case, this is a cheap & fast method before looking into
other factors.

Air can also be caused by (once) overheatet brake fluid, sloppy bleeding,
or broken/old seals in the calipher - if last, a renewal/overhaul kit
would be smart[tm] and rather cheap.

---

Might also be the (not anymore) sliding bolts on the back calipher(s),
shown by unsymmetrical worn brake pads. Quite common Audi thing ...

audiwriter@comcast.net

Try to isolate as to which wheel is making the noise. Once the noise
starts pull up on the handbrake gently to see if the noise disappears.
If it does than the problem is in the rear wheels. Once you isolate
the wheel pull the pads and check to see if they delaminated from the
backing plate. Also check the rotors to see if they are glazed. If the
appear to be glazed pull the pads and calipers to gain complete
access. Next take a roughing pad and scratch up the surface to remove
the glaze. Also rough up the pads lubricate the caliper surfaces and
reinstall and road test.





On Wed, 16 Jan 2008 18:03:53 -0000, "Andrew" <nospam@nospam.com>
wrote:

>Any suggestion for the cause of this seen as my dealer claim they are unable
>to reproduce?
>
>Audi A3 (2003) - after about 10 minutes of driving one of the wheels starts
>to give a metalic squeeling sound intermittantly up to about 30mph. When
>applying the brakes of any pressure the sound disappears. If (when
>stationary) I press really hard on the brakes the intermittant squeeling
>sound seems to disappear for a bit longer. Occurs regardless of
>weather/temperature.
>
>Not long has its MOT and nothing reported there. Had a service at an Audi
>dealer who said they were unable to reproduce, but couldn't see any problems
>with the wheel/brakes and suggested its probably dirt so pressure washed the
>wheel. Made no difference at all.
>
>No warning lights on the dash to indicate low brake pads etc - car doesn't
>feel any different to drive and brakes still stop the car as good as ever!
>
>Any suggestions to fix this?
>
>Thanks,
>Andy
>
>