1990 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

TRAC System

CAUTION: Brake fluid will damage painted surfaces. If brake fluid is spilled on painted surface, wipe it off immediately and clean with alcohol. Use only DOT 3 brake fluid from a sealed container. DO NOT mix brake fluid with any other type.
  1. Bleed TRAC system by connecting a vinyl hose to bleeder plug of accumulator. Loosen accumulator bleeder plug. Start engine. Operate TRAC pump motor until all air bubbles have been bled. Tighten bleeder plug to 74 INCH lbs. (8.3 N.m). With engine running, add brake fluid. Turn engine off.
  2. Connect vinyl tube to bleeder plug of TRAC actuator. Loosen bleeder plug. Start engine. Operate TRAC pump motor until all air bubbles have been bled. Tighten bleeder plug to 97 INCH lbs. (11 N.m). With engine running, add brake fluid. Turn engine off. Clear any code(s) stored. See CLEARING CODES .
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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