There are 13 owner-reported brakes complaints for the 2021 Ford Broncoin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Brake fault warning occurring continuously. Seems to be a wide issue with Broncos 2021-2025. The brakes become “squishy” and have to push them to the floor to stop.
Brake Light issue: Red Brake Light appears when driving over 40 MPH. To fix issue Tube Vacuum had to be replaced. Part# MB3Z 2420 This seems to be an on going issue with 2021 Broncos.
The contact owns a 2021 Ford Bronco. The contact stated that water was entering the vehicle through the roof. While the vehicle was parked, the vehicle started rolling down the hill. The contact stated that the brake pedal was continuously pumping while being depressed. The contact stated that the brake lights were illuminated. Additionally, the vehicle occasionally failed to start. The vehicle was taken to an independent mechanic who replaced the battery. The vehicle was taken to the local dealer where the battery was replaced. The vehicle was returned to the contact with rust and mold throughout the vehicle. The vehicle was repaired, but the failure recurred. The manufacturer was contacted, who opened a case and discussed a buyback. The failure mileage was approximately 14,000.
The contact owns a 2021 Ford Bronco. The contact stated that while operating the vehicle, the brake warning lamp remained illuminated. The vehicle was taken to the local dealer, who diagnosed that the brake booster vacuum line was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was not notified of the failure. The failure mileage was 30,000.
The contact owns a 2021 Ford Bronco. The contact stated that while her son was driving at an undisclosed speed, the brake pedal was depressed but failed to stop the vehicle immediately. The brake pedal was extremely stiff while depressed. The brake warning light was illuminated. The vehicle struck a speed sign, causing the front driver's side mirror to shatter, and glass shards flew inside the vehicle, cutting the contact's son's left hand and arm. Medical attention was not received. The air bags did not deploy. No police report was filed. The vehicle was taken to the dealer, where it was determined that the brake vacuum hoses, front driver's side mirror, and quarter panel needed to be replaced. Only the brake vacuum hoses were replaced by the dealer. The vehicle was not repaired. The contact stated that prior to the accident, the vehicle was taken to the dealer for the same issue; however, the dealer was unable to duplicate the failure. The manufacturer was made aware of the failure and advised the contact to file a complaint with the NHTSA Hotline. The failure mileage was 20,553.
Kepts getting hills stop brake malfunctioning anti collusion failures ant lock brake failure
I was pulling into a residential driveway and as soon as the front tires entered the driveway the pre-collision alert warning went off and when I applied the brakes they did nothing. I proceeded to roll 25+ feet and crashed into the back of a parked car in the driveway. There were people standing just to the right of the parked car I hit. The Ford dealer has had the vehicle for over 4 weeks now and all they've said is certain modules aren't communicating properly.
-I bought the Ford Bronco to Flat-tow behind my Motorhome. (All 4 wheels on the ground) -Per Ford this is permitted, they outline a procedure in the owner's manual on how this must be performed. -At least 48 states require a supplemental braking system on towed vehicle. -The Bronco has an Electronic Break Booster (EBB) -When the Bronco is placed in the Flat - tow mode, the last step is to turn the key off. -Ford has set a timer (30 to 45 minutes) to shut down power to the EBB, when the key is turned off. -After timer expires, the brakes have no boost. This causes any after-market braking system installed on the Bronco to be useless. -In these circumstances, The Bronco is providing no help to the motorhome for braking, causing longer braking distances. Also, If the Bronco were to become detached from the motorhome, the emergency braking system that should come on and stop the vehicle, would not work. Could cause injury or death by having a runaway. -Ford has been unresponsive in attempts to remedy the situation.
Flat Towing 2021 Ford Bronco with 2.7 V6 engine. After connecting my Bronco to the motorhome and putting it in the tow mode the following will occur. About 45 mins after turning the ignition off and closing the doors the EBB (Electronic Brake Boost) in the Bronco shuts down leaving the Bronco without any brake boost and leaves the supplemental brake system ineffective. When first connecting the Bronco to the motorhome the brake boost is active and the supplemental brake system must be set to match, or it will lock up the brakes on the Bronco when you stop. After the boost shuts down the supplemental brake system cannot apply enough force to the Bronco brakes to assist in stopping and all at once it takes a much greater distance to stop the motorhome than it did when the boost was working. This is extremely dangerous as a break-a-way tow vehicle would have no brakes and become a missile, or the additional weight with no assisted braking could cause a 40,000lb Class A RV to lose it's brakes down a steep grade.
Flat Towing 2021 Ford Bronco with 2.7 V6 engine. After connecting my Bronco to the motorhome and putting it in the tow mode the following will occur. About 45 mins after turning the ignition off and closing the doors the EBB (Electronic Brake Boost) in the Bronco shuts down leaving the Bronco without any brake boost and leaves the supplemental brake system ineffective. When first connecting the Bronco to the motorhome the brake boost is active and the supplemental bakes system must be set to match, or it will lock up the brakes on the Bronco when you stop. After the boost shuts down the supplemental brake system cannot apply enough force to the Bronco brakes to assist in stopping and all at once it takes a much greater distance to stop the motorhome than it did when the boost was working. Also, if for some reason the Bronco becomes detached from the motorhome that is towing it, then the Bronco becomes a missile waiting to hit what ever is in it's path as the emergency braking from the supplemental braking from the Coach would not engage and stop the Bronco.
When Flat Towing 2021 Ford Bronco with 2.7 V6 engine. After we connect our Bronco to the motorhome and putting it in Tow Mode we lose Electronic Brake Boost about 45 minutes after turning the ignition off and closing the doors. The EBB (Electronic Brake Boost) in the Bronco shuts down leaving the Bronco without any brake boost and leaves the supplemental brake system not working. When first connecting the Bronco to the motorhome the brake boost is active and the supplemental braking system must be set to match, or it will lock up the brakes on the Bronco when you stop. After the boost shuts down the supplemental brake system cannot apply enough force to the Bronco brakes to assist in stopping and all at once it takes a much greater distance to stop the motorhome than it did when the boost was working. This is dangerous and potentially life threatening.
The 21 Bronco is sold and marketed as being set up and safe to flat tow recreationally. The problem is with the 2.7l engine which has an Electric Brake Booster. After 45 mins the Battery Management system turns the Electric Brake Booster off. Thus the brakes are not powered and the required by law, brake system (3rd party) can not apply enough pressure. This is a SERIOUS design flaw. I have reached out to FORD, they denied that there is a global problem and asked me to contact my dealer. The dealer search TSB's and other systems and saw no notations and thus did not want to see the vehicle. I have asked to speak to a Bronco engineer and was denied. This is a known and confirmed issue to be found on any RV or Bronco Forum using search. PLEASE help me put pressure on FORD to fix this SERIOUS safety issue. This an on going issue thus date information below is irrelevant. 3rd party braking system is an Airforce One by Demco and was professionally installed, it functions as it should.
Flat Towing my 2021 Ford Bronco with 2.7 V6 engine. After connecting my Bronco to the motorhome and putting it in the tow mode the following will occur. About 45 mins after turning the ignition off and closing the doors the EBB (Electronic Brake Boost) in the Bronco shuts down leaving the Bronco without any brake boost and leaves the supplemental brake system ineffective. When first connecting the Bronco to the motorhome the brake boost is active and the supplemental bakes system must be set to match, or it will lock up the brakes on the Bronco when you stop. After the boost shuts down the supplemental brake system cannot apply enough force to the Bronco brakes to assist in stopping and all at once it takes a much greater distance to stop the motorhome than it did when the boost was working.
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 May 4, 2026