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As a simple answer, if you don't know what you are doing on this system then don't mess with it. These systems used a combined pressure system with a manual backup system (like normal brakes) - some even mix in the ride control (dependent on year, almost all of this class uses a ride control system with the brake system) - and if you do not know exactly what you are doing you can open a high pressure brake line and get some serious injuries.
The manual system (backup system) must be bled with the engine off, the backup pressure reservoir drained and discharged; and it is bled like any other brake system.
The normal system is bled by filling the holding tank, ensuring the backup pressure reservoir is fully pressurized (and full); you then press down and hold the brake peddle and open the bleeder valve (do not pump the peddle, watch the holding tank) until all air is discharged; do this per wheel. The ride control system, which is part of the braking system on most silver shadows, is then bled per wheel at each actuator; you must trigger the activator in order to bleed (do not remove the actuator control rod or mess with the adjustment); the car must be in park and the drivers door open.
You must use Castrol RR363 or Gerling Red brake fluid (for those years), the entire system will hold almost 1/2 to 1 gallon of fluid, but it will take at least twice that to flush the system. Also note that if non compliant brake fluid, or a contaminated system, the pressure seals will get grit in them and the system will fail (so ensure the reservoir is clean).
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∙ 13y ago
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