Problem with Cobra Brake Install

I can't speak to the FMS kit, but the Baer runs a pre-load on the rear calipers (as I would assume most rear disc kits do) and they specifically mention that the rear brakes will make noise around corners for about the first 500 miles. My kit does not have, nor does it come with, moan brackets, however, it seems like installing them would certainly help reduce noise in your situation since the calipers are designed to be used with moan brackets.

Also, I would check to make sure the alignment is correct on the caliper to rotor. Sometimes it will be necessary to shim the caliper in order to align the rotor. This is in part attributable to the facts that the tolerances vary on the axle housings and the mounting plate may not be square to the axle. As for the axle movement, it is normal to have about an 1/8" of side to side movement. This has to be accounted for in the alignment of the rotor to the caliper.

Wish I could be more help but my rears are non-fms. Good luck and keep us posted.

Redfire 05 said:

II have 2 suspisions as to the cause:
1) I don't have the moan brackets. Could this be the cause?
2) I pulled on the axles and discovered that both have a small amount of play. You can pull them out approx 1/16" more or less (I didn't actually measure it). It is obvious that they have been moving while I drive as there is a clean portion on the axle where it has been scraping on the axle seal. Should there be play in the axles? Was I sent the wrong axles?

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Is it just the rear brakes? There is some play on the rear axles. First try the anti-moan brackets.

What did you do about the booster? To get a real M2300K Cobra booster to fit on an '86 requires a LOT of work. I know, I have the M2300K kit.