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Do you have ABS?
ABS on the 05+ models came with Electronic Brakeforce Distribution, which precisely regulates brake pressure at each wheel, usually varying the front/rear brake load to first decrease initial nosedive, and later to decrease the chances of the rear brakes locking up.
I remember when I looked into doing a rear disc conversion on my old '94 Corolla (no ABS) a different proportioning valve was needed since disc brakes require different fluid pressure than drums. I would imagine that this would wreak havoc on a car with ABS/EBD.
If you don't have ABS and can find a proportioning valve from a similar car with rear discs it should work...your best bet would be one from an XRS, but I think those all had ABS standard so they wouldn't have the old-style proportioning valve.
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Toyotas in the family/next of kin:
1982 Corolla Wagon, 1989 Corolla DX, 1991 Previa LE, 1993 Previa LE,
1993 Pickup, 1994 Corolla DX, 1995 Avalon XL, 1996 Camry XLE, 1998 Avalon XL,
1998 Sienna CE, 1999 Camry XL, 2000 Camry XLE, 2002 Tundra, 2003 Tundra,
2003 ES 300, 2004 Camry XLE, 2005 Tacoma
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