2017 GMC Sierra

AFTER PARKING AND BACKING UP WHEN I HIT THE BRAKES, THEY GOT HARD AND DID NOT OPERATE PROPERLY. WHEN PULLING FORWARD THE BRAKES WERE HARD TO OPERATE AND BARELY STOPPED THE VEHICLE. AFTER SITTING A WHILE AND RESTARTING THE TRUCK THEY OPERATED AS THEY SHOULD HAVE. NOT SURE IF THIS IS AN OPERABLE SAFETY ISSUE BUT, IT WAS VERY CONCERNING THAT THE BRAKES DID NOT OPERATE PROPERLY.

I LIVE IN OREGON, MY TRUCK THAT I PURCHASED FROM A PRIVATE OWNER FROM UTAH IN JUNE OF 2019 HAD 37,300 MILES TODAY'S DATE MARCH 1 2020 MY TRUCK HAS 39,100 MILES. A COUPLE OF DAYS AGO I CHANGED TO MY OREGON LICENSE PLATE. WHILE UNDER THE TRUCK I NOTICED A LOT OF RUST ON MANY PARTS OF THE BRAKES, SUSPENSION AND FRAME ESPECIALLY WHEN I LOWERED THE SPARE TIRE WHICH SHOWED SEVERE RUST DAMAGE. THIS TRUCK HAS AN EXTREME AMOUNT OF RUST FOR A VEHICLE BUILT IN 2017. I CONSIDER THIS TO BE A SAFETY HAZARD ESPECIALLY BECAUSE DRIVERS USE THIS TYPE OF TRUCK TO HAUL OR TOW HEAVY LOADS.

TRUCK WAS RECALLED FOR BRAKES. RECALL COMPLETED WAS COMPUTER ISSUE. THAT RECALL CAUSED BRAKE VACUUM TO MALFUNCTION. ALMOST COST ME MY LIFE. 70 MPH IN DALLAS TX TRAFFIC. HAD TO SLOW DOWN QUICKLY. ONCE IT SLOWED DOWN THEN IT WOULDN'T STOP!!! GOT IT TO A PARKING GARAGE ALMOST HIT 3 VEHS. IT WAS TRAUMATIC. GM KNOWS ABOUT THIS ISSUE. MANY OTHERS HAVE REPORTED. NOT HAPPY!!!!! GM EXTENDED THE BRAKE WARRANTY TO 150000 MILES. THAT MAKES ME FEEL BETTER. THEY PUT SAME PART BACK ON. SO I GUESS IT WILL HAPPEN AGAIN. I'M VERY LEARY OF MY TRUCK.

NOTICED MUSHY, VIBRATING BRAKES. TOOK IT TO TIRE STORE AND WAS ADVISED THE BRAKE BOOSTER AND VACUUM PUMP ARE BAD. I'VE HAD SEVERAL CLOSE CALLS IN PARKING LOTS, AS THE VEHICLE IS SLOW TO RESOND TO THE APPLICATION OF THE BRAKES. THE DRIVERS SEAT IS ALSO LOOSE. IT MOVES FROM SIDE TO SIDE AS I GO AROUND CORNERS. I'M AFRAID IT WILL COME OFF THE RAILS OR WORSE YET, NOT SECURE ME IN THE EVENT OF AN ACCIDENT.

MY 2017 GMC SIERRA DENALI HAD ALREADY BEEN THE SUBJECT OF THE RECALL RELATING TO THE BRAKE ISSUE. SHORTLY AFTER THEY PERFORMED THIS RECALL WORK THE BRAKES BEGAN FAILING AT LOW SPEED. WHEN DRIVING BELOW 5 MPH, THE PEDAL WHICH SUDDENLY FALL AND THE ABS WOULD TRIGGER. DURING THIS TIME, THE CAR WOULD CONTINUE MOVING WITH THE ABS FULLY VIBRATING. THANKFULLY, MY TRAILER HITCH ABSORB THE REAR IMPACT AGAINST A WALL. THE PROBLEM CONTINUED. I THEN TOOK THE TRUCK IN FOR SERVICE AND THEY REPORTED THAT THERE HAS BEEN A SIGNIFICANT FAILURE RATE OF THE VACUUM ASSIST. THE DEALER REPLACE THE VACUUM PUMP AND VACUUM LINES. I'M EXTREMELY CONCERNED THAT THIS WOULD HAPPEN TO SOMEONE ELSE NEAR AN INTERSECTION, NOT JUST SLOWLY BACKING INTO PARKING SPACES. I HAVE CONTACTED GMC BY EMAIL BUT STILL HAVE RECEIVED NO RESPONSE OR ACKNOWLEDGMENT OF MY COMMUNICATIONS.

MY BRAKES ARE NOT WORKING TO ITS FULL POTENTIAL. I BELIEVE MY VACUUM PUMP IS GOING BACK ON MY TRUCK. I NOTICED LAST WEEK THAT I WAS DRIVING OUT OF A PARKING LOT AND COMING TO A STOP SIGN AND I PRESSED MY BRAKES AND IT WAS NOT WORKING PROPERLY. I HAD TO RELEASE THE BRAKE AND SLAM ON THE BRAKES AGAIN ALMOST CAUSING A ACCIDENT WITH INCOMING TRAFFIC. I CALLED ALL MY LOCAL DEALERSHIPS AND STATED THAT THERE WAS NO RECALL ON THIS JUST YET FOR MY TRUCK, BUT THERE IS A RECALL ON THE VACUUM PUMP. THEY STATED THEY ALREADY DID THE SOFTWARE UPDATE TO MY TRUCK BACK IN SEPTEMBER 2019. MY TRUCK WAS GOING MAYBE 10 MPH TO A STOP SIGN AND I APPLIED MY BRAKES ONCE AND WAS NOT COMPLETELY STOPPING, SO I TOOK MY FOOT OFF THE BRAKE PEDAL, AND IT GOT WORSE AND I HAD THE BRAKES PRESSED ALL THE WAY DOWN TO THE FLOOR. THIS IS NOT SAFE! THIS IS MY DAILY DRIVER AND I DROP MY KIDS OFF TO SCHOOL EVERY DAY AND ITS NOT A GOOD FEELING KNOWING MY BRAKES CAN GO OUT AT ANY TIME!

IN MY DRIVEWAY ON DRY PAVEMENT AT SLOW SPEEDS WHEN PRESSING THE BRAKE PEDAL THE VEHICLE DOES NOT STOP SATISFACTORY. THE BRAKE PEDAL WAS THEN PRESSED UNTIL IT WAS VERY HARD THE VEHICLE CONTINUED TO MOVE BUT SLOWLY BEGAN TO STOP. WHEN PRESSING THE BRAKE PEDAL TO THE MAXIMUM AND A FIRM PEDAL A NOISE COULD BE HEARD FROM UNDER THE HOOD. THE NOISE SOUNDED LIKE A MOAN, SIMILAR TO THE BRAKE ANTI SKID SYSTEM BEING ACTIVATED. I WAS ABLE TO SIMULATE THIS BRAKING PROBLEM MULTIPLE TIMES WHILE BACKING UP AND MOVING FORWARD AT SLOW SPEEDS. CYCLING THE IGNITION ON AND OFF DID NOT CORRECT THE PROBLEM.

OCTOBER 2019 WENT TO THE DEALERSHIP TO HAVE BREAKS WORKED ON GIVEN RECENT RECALL ABOUT THE MECHANICAL VACUUM PUMP OUTPUT MAY DECREASE OVER TIME, DECREASING THE AMOUNT OF VACUUM/POWER BRAKE ASSIST. HOWEVER, SHORTLY AFTER GETTING THE RECALL DONE ON MY TRUCK (1 WEEK LATER) I WAS IN THE PARKING LOT BACKING UP OUT OF MY PARKING SPOT AND THE BREAK PEDAL BECAME REALLY STIFF AND I COULDN'T PUSH HARD ENOUGH TO STOP THE VEHICLE FROM MOVING. I JUST KEPT ROLLING UNTIL I HIT THE CURB. SO FAR THIS HAS HAPPENED A DOZEN TIMES AND ALL WHEN I WAS MOVING ABOUT 5 MILES AN HOUR THE EXACT SAME WAY, PEDAL BECOMES STIFF AND I COULDN'T STOP THE TRUCK FROM MOVING. I FEEL LIKE THINGS ARE WORSE NOW AFTER GETTING THE RECALL DONE. THIS WAS NEVER AN ISSUE BEFORE AND AS I LOOK AT THE RECALL NOTICE, IT STATE INCOMPLETE, TELLING ME POSSIBLY THE MANUFACTURE KNOWS THERE'S STILL AN ISSUE BUT NO FIX HAS BEEN DONE YET, EVEN AFTER 4 MONTHS.