2015 GMC Sierra 1500 Brakes

ISSUE WHEN BRAKING THAT CAUSES THE BRAKE PEDAL TO LOSE POWER AND CAUSES THE DRIVER TO DEPRESS THE PEDAL EXTREMELY HARD TO HAVE THE BRAKES ENGAGE. THE CAUSE APPEARS TO BE A FAULTY VACUUM PUMP THAT REQUIRES REPLACEMENT. THIS COULD BE POTENTIALLY A LARGE SAFETY ISSUE IF THE PUMP FAILS AND THE VEHICLE IS UNABLE TO BE STOPPED IN TIME TO AVOID A POSSIBLE COLLISION. THIS ISSUE HAS OCCURRED BOTH WHILE IN TRAFFIC ON A CITY STREET AND WHILE ATTEMPTING TO PARK THE VEHICLE.

I WAS FOLLOWING MY DAUGHTER WHO WAS EXITING THE GAS STATION AND PULLING OUT ONTO ROUTE 149. AS SHE PULLED UP TO ROUTE 149 SHE STOPPED TO CHECK TRAFFIC. I WAS BEHIND HER IN MY 2015 GMC SIERRA 1500, GOING APPROX. 2 MPH. WHEN I HIT THE BRAKES, NOTHING HAPPENED. THE TRUCK KEPT MOVING FORWARD AND I HIT THE REAR OF MY DAUGHTERS CAR, CRACKING THE REAR BUMPER. NO DAMAGE TO THE TRUCK BECAUSE I WAS ONLY GOING A COUPLE MPH, LUCKILY MY DAUGHTER HAD HER FOOT ON THE BREAK OF HER CAR, OTHERWISE I WOULD HAVE PUSHED HER RIGHT INTO ONCOMING TRAFFIC. THE FACT THAT SHE HAD HER FOOT ON THE BRAKE IS WHAT STOPPED MY TRUCK. WE BOTH BACKED UP AND GOT OUT OF THE INTERSECTION, WHEN BACKING UP THE BRAKES WORKED FINE. THERE WASN'T A SPOT TO LEAVE THE TRUCK SO I HAD TO DRIVE 3 MILES BACK TO MY HOUSE. THE BRAKES WORKED PERFECTLY AFTER, NO ISSUES WHAT SO EVER. IT SEEMED LIKE AT THE SLOW SPEED THAT BRAKES DIDN'T HAVE ANY BOOST (OR PRESSURE), THE PEDAL WAS VERY VERY STIFF, IT FELT LIKE IT WAS PUSHING BACK AGAINST ME WHEN I HIT THE REAR OF MY DAUGHTERS CAR. BUT DRIVING HOME EVERYTHING WORKED PERFECT. I'M BRINGING THE TRUCK IN (APPROX. 72K MILES) TO HAVE IT LOOKED AT BUT I'M CONCERNED THE DEALER WILL NOT KNOW WHAT TO FIX AS THE ISSUE SEEMS TO BE INTERMITTENT. THIS WAS A VERY DANGEROUS INTERSECTION AND I COULD HAVE PUSHED MY DAUGHTER INTO ONCOMING TRAFFIC AND THE RESULT WOULD HAVE BEEN MUCH MUCH WORSE. SOMETHING SEEMS TO BE SERIOUSLY WRONG WITH THE BRAKES AND WHEN GOOGLING THIS ISSUE, I FOUND MANY SIMILAR ISSUES/COMPLAINTS REGARDING THE BRAKES.

WHILE DRIVING AT HIGHWAY SPEED, I ENTERED AN OFF RAMP TO FIND NO POWER ASSIST TO MY BRAKES. THE PEDAL WAS EXTREMELY STIFF. I CAME VERY CLOSE TO HAVING A COLLISION WITH THE CAR IN FRONT OF ME. I CONTACTED MY MECHANIC IMMEDIATELY, HE CHECKED IT OUT AND IT APPEARS THE VACUUM PUMP HAS FAILED WITHOUT WARNING. I HAVE OWNED THIS VEHICLE SINCE NEW AND HAVE HAD NO PROBLEMS WITH IT UNTIL THIS ISSUE.

TAKATA RECALL WHEN BACKING UP BRAKE PEDAL IS NOT AT ITS NORMAL PRESSURE SEEMS TO BE ALL THE WAY DOWN SO HAVE TO PRESS BRAKE HARDER TO STOP THE TRUCK WHEN I SHIFT TO DRIVE FORWARD SAME THING APPLIES. AFTER TRUCK HAS BEEN OFF FOR SOME TIME PARKED THEN START TO DRIVE BRAKES SEEM TO BE WORKING FINE.

BRAKES BECAME HARD TO DEPRESS AND ENGAGE WHILE VEHICLE WAS MOVING. ALMOST CRASHED VEHICLE. AFRAID TO DRIVE. BROUGHT TO DEALER. SAID IT WAS BAD BRAKE BOOSTER. AFTER DOING SOME RESEARCH, FOUND OUT SHOULD REPLACE VACUME PUMP, MASTER CYLINDER, HOSE LINE, ETC., SO I DID. 44K MILES, 3 YEAR OLD TRUCK, HAPPENED ON /12/10/17 BROUGHT TO DEALER GARBER GMC IN FLORIDA FOR $1300 REPAIR ON 12/11/2017. NO WARNING SIGNS WHEN THIS HAPPENED. VERY DANGEROUS WHEN BRAKES FAIL WHILE VEHICLE IS IN MOTION.

WE WANT TO REPORT A SAFETY FEATURE IN 2015 GMC SIERRA 1500. WE BOUGHT A VEHICLE BRAND NEW AND IT CURRENTLY HAS ABOUT 40,000 MILES ON THE ODOMETER. ON 11/4/2017 AFTER WE GOT OFF THE INTERSTATE 10, THE BREAK FROM THIS TRUCK STOPPED WORKING, WE HAD A DIFFICULT AND DANGEROUS TIME TO MAKE IT STOP, AND WAS LUCKY TO MANAGE TO GET INTO A STORE'S PARKING. WE HAVE TO HAUL IT TO THE LOCAL GMC ON MONDAY AND FOUND OUT THE BREAK PUMP WAS BAD. THIS PROBLEM COULD CAUSE A DEADLY ACCIDENT IF WE WERE STILL IN THE FREEWAY. WE CALLED GMC TO REPORT THE PROBLEM AND THEY SAID THERE IS NOTHING THEY CAN DO. THIS PROBLEM IS SERIOUS AND NEED TO BE ADDRESSED.

OUT OF NO WHERE, I HAD TO USE EXTREME PRESSURE ON THE PEDAL TO STOP THE TRUCK. THE BRAKES BEGAN TO SOUND ROUGH. I TURNED THE TRUCK ON AND OFF HOPING THAT WOULD FIX THE PROBLEM. IT DIDN'T, I TOOK IT INTO MY GMC DEALER TO FIND OUT THAT THE VACUUM PUMP HAS FAILED FOR THE BRAKES. I DID MY RESEARCH ONLINE AND NOTICED MANY PEOPLE HAVE HAD THE SAME ISSUE. I WAS SURPRISED THERE ISN'T A RECALL ON 2014-2016 GM VEHICLES. THIS IS DANGEROUS AND I'D HATE SOMEONE'S BRAKES FAILING AT HIGH SPEED AND SOMEONE GETS HURT.

BRAKE PEDAL DOES NOT DEPRESS EASILY AT LOW SPEEDS. EXTREAM EFFORT IS REQUIRED TO PUSH BRAKE PEDAL ENOUGH TO GET VEHICLE TO STOP.

AT 47,000 MILES. I NOTICED A SLIGHT VIBRATION IN THE FRONT END WHILE BRAKING ON THE HIGHWAY. OVER THE NEXT 2 WEEKS THE VIBRATION BECAME CONSIDERABLE WORSE. IT FELT AS THOUGH THE ROTORS BECAME WARPED WHICH I HAVE EXPERIENCED DURING VEHICLE TESTING AT PREVIOUS EMPLOYMENTS. I REPLACED THE FRONT BRAKE ROTORS AND BRAKE PADS. DURING REMOVAL OF THE OLD BRAKES, I QUICKLY NOTICED THAT 1 OF THE 4 PADS WAS COMPLETELY CORRODED THROUGH THE BACKING PLATE. BRAKE PAD CONTACT AREA WITH THE ROTOR WAS FINE, BUT THE BACKING PLATE HAD HOLES IN IT FROM THE LEVEL OF CORROSION. OTHER 3 BRAKE PADS WERE FINE, VERY MINOR SURFACE CORROSION AT WORST. SINCE REPLACING MY BRAKES THE VIBRATION HAS NEVER REPEATED.

I WAS PULLING INTO A PARKING SPOT AT WORK (SLOW SPEED) AND I COULD NOT STOP THE TRUCK. I KEPT APPLYING MORE AND MORE PRESSURE TO THE BRAKE PEDAL AND IT DID NOT STOP THE TRUCK. THE TRUCK HIT THE CURB AND STOPPED, LUCKILY THERE WASN'T A ANOTHER CAR AS I WOULD HAVE HIT IT. IT CAUGHT ME A BIT OFF GUARD AS I WAS TRYING TO FIGURE OUT WHAT JUST HAPPENED. I BACKED THE TRUCK UP ABOUT 10 FEET, BRAKES WORKED FINE IN REVERSE, AND PULLED FORWARD BACK INTO THE SPOT. AGAIN, THE BRAKES DID NOT WORK AND I AGAIN I HIT THE CURB. NO DAMAGE TO THE TRUCK, BUT BRAKES DID NOT WORK. IT FELT LIKE THE BRAKES WERE PUSHED BACK AGAINST ME. BRAKE PEDAL NEVER WENT TO THE FLOOR, I PUSHED THE PEDAL AND THERE SEEMED TO BE MORE RESISTANCE THAN NORMAL. IT DIDN'T MATTER HOW MUCH I PUSHED, THE TRUCK KEPT MOVING FORWARD. THIS HAPPENED WITH APPROXIMATELY 78,000 MILES. I WAS LATE FOR A MEETING SO I WENT INTO WORK AND LATER IN THE DAY I HAD A BREAK SO I CHECKED ON THE TRUCK. PULLED OUT OF THE PARKING SPOT AND BACK IN AND BRAKES WORKED BOTH IN REVERSE AND IN FORWARD. SO NOW WHAT TO DO????????? AT WORK I DID A QUICK GOOGLE SEARCH AND SAW THIS SIMILAR ISSUE COME UP IN A LOT OF THE SEARCH RESPONSES- AND DECIDED TO LOG IT HERE. THIS IS A HUGE ISSUE AND VERY DANGEROUS IF I WAS IN A CROWD OR PEOPLE OR AT AN INTERSECTION AND COULDN'T STOP. I CALLED GMC AND THEY SAID THEY NEVER HEARD OF ANYTHING LIKE THIS- THEY DIDN'T SEEM TO CARE, THEY SAID IF I BROUGHT THE TRUCK IN THEY WOULD SEE IF IT HAPPENED AGAIN.

I WAS IN A PARKING LOT (THANKFULLY) WHEN THE BRAKE PEDAL WAS HARD TO PUSH, AND THE TRUCK DID NOT STOP IMMEDIATELY. THERE IS A TECHNICAL SERVICE BULLETIN ISSUES FOR THIS PROBLEM PIT5405B.

2015 GMC SIERRA - BRAKING BECOMES VERY DIFFICULT AT IDLE SPEED WHETHER MOVING FORWARD OR REVERSE. BRAKE PEDAL BECOMES VERY DIFFICULT TO DEPRESS. VEHICLE WILL MOVE A FEW FEET UNTIL COMPLETELY STOPPED EVEN WITH FORCEFUL PRESSURE ON THE BRAKE PEDAL. APPEARS TO LOSE ALL VACUUM/POWER BRAKING ABILITY.

BACKING BOAT DOWN BOAT RAMP (NOT A STEEP RAMP) IN TRAILER MODE, BRAKING DID NOT STOP VEHICLE. PUMPED PEDAL SEVERAL TIMES, USED LOTS OF FORCE ON PEDAL. BECAUSE OF SLOW SPEED AND INCREASED EFFORT, THE VEHICLE DID STOP. PULLED FORWARD AND REPEATED AT SLOWER REVERSE SPEED AND SAME POOR BRAKING. DRY CONDITIONS, BRAKES DRY, DID NOT PUT REAR WHEELS IN WATER. HAVE NOT HAD A REPEATED EVENT. DEALER INDICATED THAT SERVICE BULLETIN PIT5361B APPLIES, BUT BECAUSE OF MILEAGE IT IS NOT WARRANTY. THIS SHOULD BE A RECALL.

BRAKE FAILURE WHILE TOWING A 3500 POUND BOAT. VACUUM BOOSTER SYSTEM FAILURE. I WAS MOVING SLOWLY THROUGH A PARKING LOT PULLING MY BOAT, WHEN I PUSHED THE BRAKES THE TRUCK DID NOT STOP. THE BRAKE PEDAL BOTTOMED OUT AND THE TRUCK AND TRAILER CONTINUED TO MOVE FORWARD SLOWLY

I HAVE BEEN HAVING A PROBLEM WITH THE TRAILER BRAKE CONTROLLER ON MY K3500 TRUCK. RECENTLY THE MESSAGE "CHECK TRAILER WIRING" HAS BEEN COMING ON FREQUENTLY. AT THE SAME TIME, THE BRAKING CONTROLLER SHUTS OFF POWER TO THE TRAILER BRAKES. THIS HAS RESULTED IN A VERY UNSAFE CONDITION, ESPECIALLY WITH A TRAILER THAT WEIGHS OVER 14,000 POUNDS. THIS HAS BEEN GOING ON FOR 6 MONTHS NOW. REPEATED ATTEMPTS BY BOTH THE GMC DEALER AND THE TRAILER DEALER HAVE FAILED TO RESOLVE THE PROBLEM. I HAVE BEEN TOLD, BY THE DEALER, THAT THE PROBLEM STARTED APPROXIMATELY WITH THE 2014 MODELS. THE BRAKE CONTROLLER HAS BEEN UPGRADED, AND MADE MUCH MORE SENSITIVE TO SLIGHT DEVIATIONS IN THE TRAILER SYSTEM, CAUSING THE CONTROLLER TO "SHUT OFF" SO TO SPEAK. WHILE THIS WOULDN'T BE A BIG ISSUE NORMALLY, WHEN IT SHUTS OFF, YOU LOSE ALL BRAKING ABILITY TO THE TRAILER RESULTING IN AN UNSAFE CONDITION. THERE IS NO WAY TO OVERRIDE THIS AND ACTIVATE THE BRAKES. WHAT SEEMS TO BE HAPPENING IS A VERY SLIGHT DEVIATION IN THE RESISTANCE IN THE TRAILER BRAKE SYSTEM (BY 1 OHM OR LESS) AND THAT CAUSES THE "SHUTDOWN" IN THE CONTROLLER. TRAILER BRAKES WOULD WORK, IF THEY COULD GET POWER. BUT, THE CONTROLLER HAS SHUT DOWN, SO NO POWER. MYSELF (AND THE TRAILER SHOP) HAVE BEEN CHECKING THE INTERNET AND FINDING THAT THIS IS NOT AN ISOLATED INCIDENT. IT APPEARS TO BE HAPPENING WITH ALL THE BIG THREE MANUFACTURER TRUCKS, SINCE ABOUT 2014. PEOPLE HAVE BEEN COMING UP WITH SOME RATHER "CREATIVE" WAYS AROUND THIS, IN SOME CASES ELIMINATING THE ORIGINAL SYSTEM ENTIRELY. THIS IS JUST NOT ACCEPTABLE. AGAIN, THIS "NEW SYSTEM THE BIG THREE ARE PUTTING IN IS FAR WORSE THAT THE OLD, SIMPLY BECAUSE IT HAS NO ROOM FOR FORGIVENESS IN A TRAILER SYSTEM THAT MIGHT WORK OTHERWISE, BUT HAS A SLIGHT DEVIATION IN WHAT IS CONSIDERED "ACCEPTABLE" TO THE CONTROLLER. AT THE VERY LEAST, THERE SHOULD BE A FAIL SAFE METHOD.