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Home >> Cadillac >> 2021 >> CT4 V, RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Repair Instructions >> Hydraulic Brake System Flushing

Hydraulic Brake System Flushing

  1. Inspect the brake fluid for fluid separation  contamination indicated by the following conditions:
    • Swirled appearance - oil-based substance.
    • Layered appearance - silicone-based substance.
    • Swollen master cylinder reservoir cap diaphragm and reservoir-to-master cylinder grommets - oil or silicone-based substance.
  2. Inspect the brake fluid for fluid discoloration  contamination indicated by the following conditions:
    • Cloudy appearance - moisture.
    • Dark appearance/suspended particles in fluid - dirt, rust, corrosion, brake dust.
  3. If the brake fluid demonstrates fluid separation  contamination, perform the following:
    1. Flush the system by bleeding all hydraulic circuits until the fluid becomes clear at each respective bleeder valve. Hydraulic Brake System Bleeding (JE5) , or Hydraulic Brake System Bleeding (J55) 
    2. Remove ALL of the following components from the vehicle and clean or replace as necessary.
  4. If the brake fluid demonstrates fluid discoloration  contamination, replace the brake master cylinder reservoir cap.
  5. Fill the brake master cylinder reservoir to the maximum-fill level with approved brake fluid from a clean, sealed brake fluid container. Adhesives, Fluids, Lubricants, and Sealers 
  6. Pressure bleed the hydraulic brake system. Hydraulic Brake System Bleeding (JE5) , or Hydraulic Brake System Bleeding (J55)