It has been 10+ years since I put new brakes on a Lumina. I can't remember what I did last time. I am doing the rears on my brother's 1994. I bought the square tool to turn in the pistons on the calipers. If I turn clockwise the piston seems to come out. If I turn counterclockwise it seems the piston goes no where.

Anyone familiar?

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

You have run into a well known problem on these cars. It is about 99% that the piston is frozen in place and can never be retracted.

The only cure is to buy a rebuilt caliper. These are not expensive and will bolt right up.

By the way, due to a principal of Physics that is too complicated to go into here, the frozen caliper piston on the rears can destroy your front brakes as well since they are now doing about 180% of what they are rated for, so installing a new or rebuilt rear caliper will not only get your rear brakes working but will also save your fronts.

stick with VW bugs they are the ultimate skinflint car--well maybe an old diesel vw is.

X2 on this one. Rebuilds are cheap at your local napa, as it's just a typical gm passenger platform.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth