I know this is strange. And for years I had no problems with the rear
brakes or noise. This car had been used by my ex until last year and I
rarely drove it unless to tend to a repair job. But in the last year,
after the rotors were replaced, this noise appeared. Since I thought it
a bad driveaxle and I was a bit short on cash and had a reliable 300TD
for a daily driver, I parked the coupe. But once I started attending to
the noise problem and replacing various parts, all with no effect, the
rotor and /or bolts are my point of attack now. These are the original
bundt pans (I labeled the inside of wheel since I sometimes swaped them
around with the others). The rotor has the locating hole and I position
it on the pin and snug everything down. One of the first times I heard
the sound I pulled the wheed and found the brake pad pins loose and
thought that was a possible source of the problem, but since then the
pins are driven home and flush with the caliper. Last night I removed
the parking shoes on the suspect wheel, so even if the bolts were too
long there is nothing in there to rub. A few weeks ago one of my
strategies was to compress the pads into the caliper before leaving in
the morning and got a little bit of relief. My thinking was a faulty
caliper with failed seals ( the caliper was the original and looked
quite worn at the piston edges). Yet replacing the caliper changed
nothing. I will check the perceived tightness of the wheel tonight
after snugging the bolts. Maybe the bolts a loosening from the hub
enough to give the problem, so I will switch bolts as a test.
Neal
Jim Cathey wrote:
more convinced that the rotor is the problem; it just seems too loose.
Maybe wheel bolts are too long to give a tight fit, but I really snug
them with a cheater bar.
This sounds totally strange. The rotor is one piece, and is supposed
to be tightly pinned between the hub and the wheel by the bolts. I
believe it has an extra sixth hole for a locator pin that's on the hub
that has to be in the right rotor hole or you can't even put the wheel
on. I don't see how the rotor could be loose at all without the wheel
also being loose. Wheel bolts that are too long (such as alloy wheel
bolts used on steel wheels) will protrude into the hub far enough to
interfere with the parking brake mechanism. That's usually obvious,
and bad!
These _are_ the right wheels for the car, right? Stock alloys?
-- Jim
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