There are 6 owner-reported brakes complaints for the 2008 GMC Yukonin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
WHEN I ENGAGE THE BRAKES TO SLOW DOWN THEY GRAB, ALL THE TIME ON ANY STREET.
TL* THE CONTACT OWNS A 2008 GMC YUKON DENALI. THE CONTACT STATED THAT WHILE DRIVING AT 60 MPH, THE VEHICLE SUDDENLY STOPPED AS THE STABILITRAK, THE PARK ASSIST, THE BRAKES, THE SERVICE ENGINE AND THE TRACTION CONTROL WARNING LIGHTS ILLUMINATED. AS A RESULT, THE CONTACT LOST CONTROL OF THE VEHICLE. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC, WHO DETERMINED THAT THE TRANSMISSION CONTROL MODULE NEEDED TO BE REPLACED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 97,289. UPDATED 06/29/16*LJ
LOSS OF BRAKE PRESSURE, PEDAL WENT ALMOST TO FLOOR. BRAKE WARNING ANNUNCIATOR STABILITRAK CAUTION ANNUNCIATOR SERVICE BRAKES SOON MESSAGE ON DIC STABILITRAK FAILURE MESSAGE ON DIC DRIVING HOME FROM WORK, RADIO ON, AIR CONDITIONING ON, DRIVING FOR ABOUT 10-15 MINUTES A GUY IN FRONT OF ME DOES A QUICK LANE CHANGE AND TURN IN FRONT OF ME. I HAVE TO STEP ON THE BRAKE HARD BUT NOT SUPER HARD. WHEN I DID THIS THE BRAKE PEDAL WENT FURTHER THAN NORMAL AND ALL OF THE ABOVE WARNING LIGHTS ILLUMINATED ON THE INSTRUMENT PANEL. A). I SLOWLY PULL INTO A PARKING LOT (2-3 MPH) AND THE PEDAL GOES ALMOST TO THE FLOOR. ALMOST CANNOT STOP. B). I SHUT OFF THE VEHICLE AND RESTART BUT THE LIGHTS COME ON AS SOON AS I PRESS ON THE BRAKE. I DO THIS SEVERAL MORE TIME, CHECK BRAKE FLUID RESERVOIR BUT THE SAME RESULTS. C). AFTER ABOUT THE 6 TIME RESTARTING, I HEAR A SMALL MOTOR RUNNING ( BRAKE ACCUMULATOR / MODULATOR ? ) AND THE PEDAL BEGINS TO GET FIRM AGAIN AND THE WARNING ANNUNCIATORS EXTINGUISHED. D). I CONTINUED DRIVING HOME SLOWLY WITH NO FURTHER FAULTS. DIDN'T THINK OF CHECKING THE VOLTAGE UNTIL EVERYTHING WAS GOOD, AT THAT POINT IT WAS INDICATING 15VDC. THIS PROBLEM HAS OCCURRED INTERMITTENTLY MANY TIMES SINCE THEN. HAVE TAKEN TO KEEPING ONE FOOT ON EMERGENCY BRAKE. THE DEALERSHIP REPLACED BRAKE MASTER CYLINDER BUT THIS DID NOT FIX PROBLEM. DEALER ORDERED THE ELECTRIC PUMP (BRAKE MODULATOR) AND TWO WEEKS LATER DEALERSHIP STATES GM CANNOT LOCATE ANY PARTS TO REPAIR THE VEHICLE. PART REMAINS ON ORDER. VEHICLE NOT OPERABLE WITHOUT BRAKES. *TR
THE CAR WAS PARKED IN LINE AT MY KID'S SCHOOL, WAITING TO PICK HIM UP. THE CAR ENGINE WAS TURNED OFF. WHEN THE CAR WAS TURNED ON, WARNING LIGHTS FOR TRACTION CONTROL, BRAKES AND STABILITRAK CAME ON. AFTER MOVING SLIGHTLY FORWARD, THE CAR WOULD NOT STOP DESPITE FLOORING THE BRAKE. LUCKILY A SPEED BUMP STOPPED THE CAR. WE LEFT THE CAR WHERE IT WAS AND WE TRIED AGAIN THE FOLLOWING DAY. THE SAME LIGHTS CAME ON AND THE BRAKES STILL COMPLETELY UNRESPONSIVE, THE CAR COASTED TO A STOP. THE CAR WAS TOWED TO THE DEALERSHIP. *TR
ROCKS ENTER A SMALL HOLE OF THE REAR BRAKES CAUSING THEM TO BE LODGED IN THE BRAKE DRUM AND MAKING IT NECESSARY FOR A MECHANIC TO REMOVE. MY CONCERN IS THAT I WON'T KNOW ROCKS ARE IN THERE AND THEY WILL CAUSING A BRAKING PROBLEM RESULTING IN AN ACCIDENT. *TR
VEHICLE BRAKE SYSTEM RESPONDS ERRATICALLY ABOUT ONCE EVERY 100 MILES. IT HAS CAUSED NUMEROUS NEAR MISS ACCIDENTS. THIS PROBLEM HAS HAPPENED ON NUMEROUS OCCASIONS BUT I'LL DESCRIBE THE MOST RECENT. I WAS DRIVING DOWN A LOCAL HIGHWAY AT ABOUT 50 MILES AN HOUR. TRAFFIC WAS BACKING UP AND CAME TO A STOP. I HIT THE BRAKES (NO DANGER/EMERGENCY, JUST A NORMAL STOP). THE VEHICLE SLOWED NORMALLY TO ABOUT 15 MILES PER HOUR AND THEN THE BRAKES "LET GO" AND THE DECELERATION STOPPED EVEN THOUGH MY FOOT WAS STILL ON THE BRAKE PEDAL. I HAD TO RELEASE THE PEDAL AND SLAM ON THE BRAKES ANEW TO GET THE VEHICLE TO STOP BEFORE SLAMMING IN TO THE TRAFFIC IN FRONT OF ME. THIS HAS HAPPENED SEVERAL TIMES SINCE AND IT SEEMS TO OCCUR WHEN THE VEHICLE IS SWITCHING FROM HYBRID TO NON-HYBRID MODE AND/OR WHEN THE REGENERATIVE BRAKING IS CYCLING ON OR OFF. MY VEHICLE IS A 2008 GMC YUKON HYBRID IT'S BEEN TAKEN TO THE DEALER AT LEAST TWICE FOR THIS PROBLEM BUT NOTHING HAS BEEN REPAIRED. I CAN'T RECREATED THE PROBLEM ON DEMAND, BUT IT HAPPENS ON AVERAGE ONCE A WEEK AND SCARES ME SO MUCH THAT I DON'T FEEL SAFE DRIVING IT ANYMORE. IT'S JUST A MATTER OF TIME BEFORE THERE IS A SERIOUS ACCIDENT. *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026