Owner of an Chevrolet Silverado Duramax on Alabama, Estados Unidos, reported a sequence of serious faults in the recently purchased vehicle. The owner, identified as John Nelson, posted videos on TikTok showing the brake pedal sinking completely without resistance during a routine commute. The incident occurred around 10:10 a.m. on December 21, ET.
The problems began shortly after purchasing the truck equipped with a 6.6-liter Duramax diesel engine. The diesel particulate filter (DPF) was defective, requiring repair at an authorized dealer. The repair took almost a month and the truck was back on the road. Após traveled around 16 thousand kilometers, the engine began to present noises and knocks, leading GM to recommend a complete replacement of the unit.
Changing the engine required removing the cab from the chassis, a complex procedure common in HD diesel pickup trucks. The vehicle was parked for almost two months. The owner alleged that the dealership did not provide a spare car or cover towing costs, despite GM’s bumper-to-bumper warranty providing assistance in cases of warranty repairs.
Warranty repair sequence
The owner recovered the truck after replacing the engine. Ele expected to resume normal work activities. Instead, he discovered a brake system failure.
The pedal sank to the floor without offering resistance. Ele dismantled the hydrovacuum system personally. The set uses hydraulic pressure from the steering pump for assistance, common in heavy pickup trucks.
Details of the hydrovacuum failure
Dealership technicians removed the cab during the engine change. Eles unscrewed the hydrovacuum unit. A fixing screw was left without suitable threadlocker or anti-seize compound.
The nut came loose with vibrations. The screw bent with use. Componentes internal parts, such as the spring, plunger and lock, came loose inside the housing.
GM does not sell the screw separately. The catalog indicates that the component integrates the complete hydrovacuum unit. The owner estimated the cost of around US$400 for the set, without labor.
Owner and community reactions
The owner no longer trusts the vehicle. Ele transferred tools to an old 2016 Silverado. Ele pressured the dealership to recover the truck and access equipment.
Comments on TikTok express sympathy and criticism of the dealership’s service. Alguns users suggested dark humor about the case. Outros debated whether air entered the hydraulic system during reassembly.
Automotive experts commented that the engine replacement procedure requires care to avoid air pockets. The NHTSA warns that incomplete reassembly or inadequate torque may cause partial or complete brake failure.
Temporary solution and prospects
The owner temporarily reassembled the hydrovacuum. Ele searches for compatible M10 screw and nut to replace the bent item. This measure avoids purchasing the complete set.
The complexity of modern diesel engines demands precise repairs. A neglected component can compromise security. Estudos in the sector indicate increasing difficulties in workshops with advanced emissions and electronic systems.
Impact on diesel pickup truck owners
Similar cases highlight risks in vehicles with DPF sensitive to urban use. Proprietários of HD diesel pickup trucks need to drive long distances on highways for adequate regeneration. Engine replacement under warranty involves invasive procedures.
The case went viral with almost 800,000 views on the videos. The owner plans a permanent solution without high costs. GM has not publicly commented on the specific incident.
