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if you don't have return pressure... is that all the time or only if you hold your foot on the clutch for a given amount of time?
Early Mr2's have cast iron master cylinders --- which after time the water absorbed into the fluid will pit the cylinder of the master cylinder -- so it's quite common for Toyotas with cast cylinders to feel ok going in, but the fluid actually gets trapped in the walls of the cylinder, and when you pull back the seal actually seals better going backwards and pulls fluid into the cab.
If this is the case, order a new one -- DO NOT REBUILD because you will have the same problem shorty after. When you do order one, order a Clutch master cylinder for an 89 -- that way to ensure you get the better aluminum pieces that don't pit.
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