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Home >> Cadillac >> 2019 >> ATS Premium Performance >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Repair Instructions >> Brake Pressure Modulator Valve Pipe Replacement (LF4 - Primary) >> Removal Procedure

Removal Procedure

  1. Remove the plenum front panel. Plenum Front Panel Replacement
  2. Remove the charge air cooler cover. Charge Air Cooler Cover Replacement
  3. Disconnect the heater inlet pipe from the heater core only. Heater Inlet Hose Replacement (LF4)
  4. Disconnect the heater outlet pipe from the heater core only. Heater Outlet Hose Replacement (LF4)
  5. Without removing the steering shafts from the vehicle, separate the upper intermediate steering shaft from the mid intermediate steering shaft. Upper Intermediate Steering Shaft Replacement (RWD With LF4, LGX)
  6. Using a suitable tool, remove and properly dispose of the brake fluid from the master cylinder reservoir.
  7. GM2830954Courtesy of GENERAL MOTORS COMPANY

    Disconnect the brake pressure modulator valve primary brake pipe fitting (1) at the master cylinder.

  8. Plug the master cylinder outlet port to prevent brake fluid loss and contamination.
  9. Remove the air conditioning evaporator hose assembly. Air Conditioning Evaporator Hose Replacement (LF4, LGX)
  10. GM2830957Courtesy of GENERAL MOTORS COMPANY

    Release the brake pipe from the retaining clips (1).

  11. GM2830958Courtesy of GENERAL MOTORS COMPANY

    Release the brake pipe from the retaining clips (1) on the cowl.

  12. GM2830959Courtesy of GENERAL MOTORS COMPANY

    Release the brake pipe from the retaining clip (1).

  13. GM2830965Courtesy of GENERAL MOTORS COMPANY

    Disconnect the brake pressure modulator valve primary brake pipe fitting (1) at the brake pressure modulator valve (BPMV).

  14. Plug the BPMV inlet port to prevent brake fluid loss and contamination.
  15. Remove the brake pressure modulator valve primary brake pipe.