Re: [DML] Chirping sound and more

["Walter Coe" <Whalt@xxxx>]

If the squeak happens only when you apply the brakes & is worse when the
brakes are cold, then it sounds like you have glazed pads. This can happen
when new pads are not broken in properly. To fix this, what you need to do
is take the pads off, rough up the pad's surface with sandpaper and do the
same for the rotors. If this is your problem then you will see a noticeable
difference as you sand the glaze off. (The glaze usually gives the pads &
rotors a blue/gray color.) I suggest using a coarse grit sandpaper such as
100 or 150 grit. Before you finish, spray the pads & rotors liberally with
disk brake cleaner to remove any grease, fingerprints & sanding residue. Be
extra careful with the dust if you are using asbestos-containing brake pads.
Then with everything back together, break in the brakes carefully. Bring
the car up to approximately 30 miles per hour, then apply the brakes very
slowly & gently until the car stops. Wait at least 20 seconds then repeat
this procedure for a total of 10 cycles. The purpose of this procedure is
to help get the pads seated properly. This is especially important if you
have not had your rotors cut in the process of replacing your pads. The
high spots (grooves) on your rotors will touch the pads first providing
inadequate surface area to dissipate heat. This heat buildup is what causes
the glaze to form. Once you have done the initial break-in, continue to use
the brakes gently for the next 500 miles while the pads wear to match the
grooves in the rotors. Even with new (or cut) rotors, a 500 mile break-in
period is the rule of thumb for all cars.

Walt Tampa, FL