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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,871 Posts
With an ABS stop, it is normal for the pedal will drop lower and buzz. If the pedal is already low to begin with, it will be even worse.
I think your problem is at the rear wheel cylinders and the drums will have to come off for a better look. If the fluid that came out of them looked bad, I'm sure that they are internally rusted. You may not see a wheel cylinder leak until you pull the drum.
There should be 2 bolt holes (in the lug nut bolt circle) where you install 2 - 8mm x 1.25 bolts to walk the drum off the hub. Use solvent and lube on the hub and the threads if the drum is rusted on.
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,871 Posts
Hot front pad odors may mean that the rears aren't doing their fair share in stopping the vehicle. Have someone step gently on the brake pedal gently while you watch for both rear shoes move outwards, one side at a time. If only the primary shoe moves, block it with a screwdriver to see if the secondary shoe moves. The inside of the drum might show how well the shoe linings are making contact.
Hold-down hardware and self-adjusters can rust up also.
Wheel cylinders can leak and sieze up after some time and they are fairly cheap to replace, if needed.
 
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