Rear brakes on 66 dart NOISE and stutter?? HELP

Haven't tried it, but I would sure expect the fronts to skid first when going in reverse since they are designed to give 70% of the braking force, as needed when going forward. That would be way off in reverse, where they then should act as rears (need 30% of force). When going forward, the fronts should skid slightly before the rears skid. You don't want the rears to skid first or the rear-end can slip around. Test in a wet parking lot and keep applying until the rears also skid. Of course, design is for factory bias-ply tires, certain brake linings, etc. You can tweak the ratio w/ an adjustable proportioning valve to the rear circuit, which almost mandatory when installing after-market front disks or unequal F/R tires. Many pickups and vans must deal with greatly varying loads and have an "automatic prop valve" which has a lever finger to sense the sag in the rear to compensate for various loads.

Re asbestos, that is the State Mineral of CA (serpentine). The El Dorado Hills east of me (and SF East Bay) is filled with it, and I think many gravel roads have it, so imagine all that white dust churned up in the dry summers. A few years ago, the EPA did tests, sliding on a baseball field while wearing moon suits and air samplers. Also, reports of dogs autopsied w/ lungs full of asbestos. Then it all became quiet. Those are very expensive neighborhoods, so the lawyers probably pressured congressmen who pressured the EPA. Always "follow the money" and things make more sense.