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Brake Master Cylinder Pressure Sensor Replacement

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Brake Master Cylinder Pressure Sensor (With RPO JL1 & Without JL4)
GM1990507Courtesy of GENERAL MOTORS CORP.
Callout Component Name
WARNING: Refer to Brake Fluid Irritant Warning .
CAUTION: Refer to Brake Fluid Effects on Paint and Electrical Components Caution .

Preliminary Procedures

  1. Turn the ignition switch to the OFF position.
  2. Apply the park brake.
  3. Disconnect the brake master cylinder pressure sensor electrical connector.
1 Brake Master Cylinder Pressure Sensor
CAUTION: Refer to Fastener Caution .

Procedure

  1. After the installation is complete, bleed the hydraulic brake system at the front wheels only. It is not necessary the bleed the rear hydraulic circuit. Refer to Hydraulic Brake System Bleeding (Manual)  or Hydraulic Brake System Bleeding (Pressure)  or Hydraulic Brake System Bleeding (Two-mode Hybrid) .
  2. Do not lubricate the sensor threads prior to installation.

Tighten:  26 N.m (19 lb ft)
2 Brake Master Cylinder Pressure Sensor O-ring Seal

Procedure

  1. Discard the O-ring seal.
  2. Do not lubricate the O-ring seal prior to installation.
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