i have an 87' supra.....and i had the same problem, first i checked the bulbs, bulbs were good, then i checked the fuse, the fuse was good, then i checked the "yellow box" you were talking about, i opened it up and found a burnt circuit( the box is under the driver's tailight ), so i replaced it and the brakes work perfect now........i got it on ebay LAMP FAILURE TOYOTA model no. 89373-32120, its cheap and easy to fix, because the toyota dealer was charging me 280 over here in jersey..........hope it helped you
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