Make sure the rear shoes are adjusted properly, and you need to bleed that lspv.
From the link below: The proper order for bleeding the system is to start with the longest hydraulic line and work around the vehicle to the shortest line, and then do the LSPV last. So in this case, the order is: driver's rear wheel, passenger rear wheel, passenger front, driver's front, LSPV."
Check this link, helpful break stuff:
Care and Bleeding of Your Brake System.
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92 ExtraCab on 38s: built for go, not for show
88 4runner: Solid axle, doubler, fun stuff
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