Re: '72 Suburban - brake proportioning
I drove a 71 sub for 10 years and never had the problem of back brakes locking; wet, dry or snow. I don't think it is normal. One of the major complaints of subs of most generations is that they don't use enough of the rear brakes and thus they tear through front pads and rotors very fast. I would think if it were normal, all the trucks would constantly be locking since there is way less weight in the back but has the exact same brake system.
No solution for you but that is my experience.
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