Our Supra's use Dot 3 brake fluid. Try bleeding the brakes first. Air in the lines doesn't always result in a spongy pedal. While you are bleeding the brakes, inspect the rubber brake hoses at each of the wheels for any splits or cracks. Move them around a bit and make sure they are still flexible. Brake hoses are often neglected, and therefore a common failure point on 20ish year old cars.
If the brake lines are in good shape and bleeding the brakes does not fix the problem, remove the master cylinder and bench bleed it. If that doesn't fix it, then that is likely your issue.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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