Rob Kinnan
Brand Manager, Mustang Monthly
March 1, 1999
Photos By: Brendan Maze

Step By Step

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The anti-moan bracket (one per side) triangulates the caliper mounting bracket to completely get rid of caliper vibration and, hence, that irritating moaning noise. The stock bracket is too tall to fit earlier cars, so it must be cut where indicated here.
About an inch needs to be removed. GRC used a cut-off wheel for the cut.
Once the bracket is cut, bolt the pieces to the rearend housing as shown, making sure they touch each other. The axle tube bracket is held on with a U-bolt, and the other half is fastened with the caliper bolts. Once everything is lined up, tack weld the pieces together.
The finished bracket is shorter, but it’s also not quite as wide, as shown here.
Here is the finished bracket. This shows how the anti-moan bracket triangulates the caliper mount to prevent it from vibrating.

SVO and Stainless Steel Brakes both have excellent, affordable rear–disc-brake swap kits for 8.8-equipped Mustangs, but what they both leave out are two little brackets that Ford engineers finally figured out with the ’94 model.

With rear discs, there is often a harmonic that resonates from the rear of the car when you get on the brakes. This harmonic comes from the calipers vibrating. As long as the stereo is cranked or your 3-inch exhaust is blasting, you probably won’t notice it, but it’s loud enough that some people get annoyed. The SVO rear-disc kit comes with the factory anti-moan brackets but, in some cases, they’re too short to fit the earlier housing.

GRC Performance recently showed us how to modify a pair of these brackets to quiet an earlier car’s rear discs. It only takes a little bit of time, but the only hangup for most of us is that it requires welding. Now, granted, disc-brake moan might not be your top priority, but for those of you irritated by the noise, GRC has the fix. Check it out.