Yeah, get another quote. I completely redid my rear brakes about a year ago, lining, springs, hardware, rebuilt the wheel cylinders, and I think parts were about the same, easier to find than the ones for my 02 Cavalier, and nothing new for an old coot to figure out how it worked. Rear axles have seals, but any I ever messed with had one on each side. I have not had to do my LUV. If nobody that has reports, I will see what my shop manual says. I don't think Big O knows what they are doing and was giving a high quote to cover the unknown. It is actually a simple, cheap job.
The locking up could be old, weak springs, gummed up cylinders, or a bad hose. I think you can buy all new for $50 or less. I usually rebuild wheel cylinders in place. Saves messing with old froze up lines and bolts.
Note, LUVs use conventional inverted double flare nuts on brake lines, but they are 10 mm - 1mm thread. They look much like the 3/8''-24 thread older American stuff used. They are a little hard to find.
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