All Investigations » Investigation PE18012

  Defect Investigation of Brake Vacuum Pump Failure

Investigation of Brake Vacuum Pump Failure

Subject: Brake vacuum pump failure
Components covered:
  • Service brakes
  • Brake power assist vacuum
Investigations Summary: The office of defects investigation (odi) has received 111 reports of hard brake pedal effort accompanied by extended stopping distance in model years (my) 2014 to 2016 general motors (gm) light trucks based on the k2xx platform, 1500 series pickup trucks and sport utility vehicles (silverado, sierra, suburban, yukon, tahoe, escalade). These conditions are attributed to deterioration of the engine-driven brake assist vacuum pump. Nine of these incidents included vehicles incurring damage as a result colliding with another vehicle or fixed object at low speeds. The brake assist vacuum pump is driven by an accessory belt on the engine and serves as the source of power brake vacuum in the subject vehicles. Over time, the pump's capacity to generate vacuum may deteriorate. The subject vehicles receive supplemental hydraulic brake assist from the abs system, albeit at lower levels than the vacuum-powered primary system. If the brake assist vacuum pump fails to operate as intended, the amount of brake power assist supplied to the driver can be significantly reduced, extending the subject vehicle stopping distance. A preliminary evaluation has been opened to assess the scope, frequency, circumstances, and safety consequences of the alleged defect. The odi complaints cited above can be viewed at www. NHTSA. Gov under the following odi identification numbers: 11143759, 11143710, 11143349, 11142826, 11142685, 11142544, 11142374, 11140624, 11140321, 11139980, 11139614, 11139210, 11132847, 11132455, 11131903, 11131066, 11128191, 11124506, 11124227, 11123463, 11121979, 11121611, 11102448, 11101165, 11099906, 11121172, 11119847, 11118984, 11118870, 11111834, 11115151, 11114340, 11113548, 11112722, 11110640, 11110393, 11110264, 11105051, 11104203, 11103906, 11104097, 11101822, 11102108, 11100297, 11099907, 11098785, 11097335, 11094026, 11011875, 11090358, 11089691, 11089278, 11089173, 11088926, 11084934, 11084610, 11082247, 11078820, 11072654, 11065323, 11056319, 11081406, 11072905, 11075730, 11067395, 11056635, 11055292, 11021419, 11065274, 11064605, 11064080, 11063087, 11056908, 11054734, 11054123, 11053444, 11067234, 11048544, 11048333, 11046974, 11045731, 11044677, 11031984, 11030722, 11030016, 11025403, 11022709, 11020372, 11003691, 10995134, 11047239, 11043192, 11034792, 11034518, 11033883, 11032103, 11030685, 11021601, 11006271, 11002554, 11001423, 10991595, 11013706, 10984684, 10967071, 11119907, 11083289, 11062858, 11047981, 11041607, 11021253
Vehicles Affected by this investigation:
  • 2014 Cadillac Escalade
  • 2015 Cadillac Escalade
  • 2016 Cadillac Escalade
  • 2014 Cadillac Escalade Hybrid
  • 2014 Chevrolet Silverado 1500
  • 2015 Chevrolet Silverado 1500
  • 2016 Chevrolet Silverado 1500
  • 2014 Chevrolet Suburban
  • 2016 Chevrolet Suburban
  • 2014 Chevrolet Tahoe
  • 2015 Chevrolet Tahoe
  • 2016 Chevrolet Tahoe
  • 2014 Chevrolet Tahoe Police Pursuit
  • 2015 Chevrolet Tahoe Police Pursuit
  • 2016 Chevrolet Tahoe Police Pursuit
  • 2014 GMC Denali
  • 2015 GMC Denali
  • 2014 GMC Sierra
  • 2015 GMC Sierra
  • 2016 GMC Sierra
  • 2014 GMC Sierra 1500
  • 2015 GMC Sierra 1500
  • 2016 GMC Sierra 1500
  • 2014 GMC Yukon
  • 2015 GMC Yukon
  • 2016 GMC Yukon

    Other investigations related to GMC vehicles

  Defect investigation of driver's master power window switch

  Defect investigation of fuel level gauge system failure

  Defect investigation of engine cooling fan fracture

  Defect investigation of interior door handle laceration risk

  Defect investigation of brake line corrosion failure