The disk is picking up the pad, slapping it against its pins and/or the cutout
in the caliper, then letting it drop as
it rotates. There's some debate as to whether rotors can 'warp' (Carroll Smith
was adamant that 'warping' was caused by
uneven buildup of pad material on the rotors). At any rate, turn the rotors
and try a different pad. I've had great
results with Ferodo pads--better stopping as well--but some of the modern
ceramics may be even better.
Bob
On 8/21/2013 7:30 PM, Mike Garvey wrote:
> My front wheels make a clicking noise as I drive; it's reminiscent of my
> childhood days when I put a playing card to flap against the spokes of my
> bicycle.
>
>
>
> My tentative diagnosis is that it is the disk pads that get "pulsed" once
> every time the wheel rotates and the fit of the pads is loose enough that
> they "click". The clicking stops when I apply the brakes. Suspecting that
> perhaps the disk was the root cause (since the rolling resistance varies a
> bit as I rotate the wheel by hand), I measured the run-out of the (outside)
> surface of the disk; it measures 0.005 inches, peak-to-peak. The BMC manual
> says that run-out should not exceed 0.004 inches. It's not easy to measure
> the disk thickness, so I've not done that yet.
>
>
>
> The disks appear to have been replaced during the restoration (by the former
> owner) about 2 years ago. I recently installed the shims that Moss sells to
> alleviate brake squeal (which are very effective I find).
>
>
>
> Do all/most Healeys make this noise? Should I just have the disks turned?
>
>
>
> Thanks in advance, Mike
>
>
>
> Michael Garvey
>
> 1967 BJ8/38046
>
> Swampscott, MA
> _______________________________________________
>
>
>
--
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Bob Spidell San Jose, CA bspidell@comcast.net
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