Issue ID | 1531792 |
Internal NHTSA # | 11171742 |
Manufacurer | General Motors LLC |
Brand | GMC |
Model | SIERRA 1500 |
Model Year | 2014 |
File date | 02/01/19 |
Component | SERVICE BRAKES |
Product type code | VEHICLE |
Description of the problem | Drove my vehicle about 15 miles and parked it in a parking lot for about 10 minutes. When i returned and backed out of the parking space the brake pedal would not compress much at all unless i pushed on it with some body weight for leverage and only then the vehicle barely stopped - was travelling at a very low speed but still very hard to stop the vehicle. I tried to pump the brake pedal, then carefully moved the vehicle a couple of times to test the brakes and the condition repeated. I then parked the vehicle and shut off the engine momentarily. The condition persisted when i restarted the vehicle. I started to drive the vehicle slowly and carefully in a loop around the parking lot pumping the brakes a couple times and the pedal finally returned to normal. Had i been on the highway when this condition occurred or had i been towing our 5k-lb trailer the consequences could have been catastrophic. Reading online the issue appears common in gm trucks from 2014 up and the cause was often a failing vacuum pump. I located a copy of a service bulletin published internally by gm discussing the issue and prescribing a repair procedure. The bulletin noted that if engine oil escaped past the seal(s) of the failing vacuum pump replacement of the brake booster, master cylinder, and vacuum line may be required in addition to the pump. Given the appearance of this as a common issue, fear of losing brakes again, and fearing that waiting may necessitate other braking components under the hood needing replacement if the oil seeped through the pump, i promptly replaced the vacuum pump. Following the repair procedure prescribed in the gm bulletin there was no engine oil noted in the vacuum line so no further parts were replaced other than the pump and gasket. Condition has not repeated after replacing pump 1k miles ago. Vehicle had approx. 65k miles when this condition occurred. |
Vehicle Mileage at Failure | 65000 |
Number of Occurences | |
Source of the issue | NHTSA WEB SITE |
City and State | FRANKLIN, OH |
VIN pattern | 3GTU2UEC2EGXXXXXX |
Was vehicle invloved in a crash? | N |
Was vehicle involved in a fire? | N |
Was incedent reported to police? | N |
Was medical attention required? | N |
Was part original equipment? | |
No. of injured persons | |
No. of fatalities | |
Date of purchase | 29/06/24 |
Was original owner? | N |
Anti-lock brakes | N |
Cruise control | N |
Number of cylinders | |
Drive train type | |
Transmission type | |
Vehicle speed | 2 |
DoT tire identifier | |
Tire size | |
Location of tire code | |
Type of tire failure code | |
Was defective tire repaired? | |
Date of manufacture | |
Type of child seat code | |
Type of restraint | |
Dealer's name | |
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Dealer's ZIP code |