Toyota 4RUNNER brake failure problems

Filed Feb 21, 2026 · Brakes · FL

My 2025 Toyota 4Runners brakes have a very high pitched squeal. This is most noticeable when backing up but sometimes when applying the brakes going forward, especially in wet conditions. I feel the brakes may fail at some point causing an accident. Twice I’ve had other vehicles slam their brakes on or attempt evasive action thinking I was going to hit them because the noise was so loud they heard it inside their vehicle. This did happen in a parking lot and not on the road. It is my understanding Toyota had a service bulletin to fix the issue under T-SB-0046-25 which was issued in July 2025, however to date, Toyota has not repaired my vehicle. It is my understanding that some vehicles were repaired under the bulletin but the fix did not correct the problem. I was told by my local Toyota dealer this week that Toyota told them to stop all repairs because the TSB was not correcting the issue and they were waiting for Toyota engineers to find a new solution. Request your assistance in getting Toyota to repair all the vehicles affected by this problem before a serious accident occurs because of brake failure or another driver taking evasive action when they hear this noise.

Filed Aug 22, 2024 · Brakes · CA

Brake failure. Unable to stop vehicle. Dealer found internal brake failure

Filed Jan 28, 2024 · Brakes · NY · crash

While pulling this vehicle in to my garage about halfway in the brake pedal went to the floor and the vehicle hit a bench on the opposite side of the entrance. After pumping the brakes after waiting about 10 minutes they seemed to work normally. I backed the vehicle out of the garage and saw NO fluid under the vehicle. The next morning the vehicle was towed the the dealer collision shop and then taken to the service department at the dealer. This problem; ,after almost 2 months was never solved....corporate offices checked the data recorder...no conclusions.....and implied this problem did not occur. The body is now being repaired yet no brake problem has been ever repaired. ( under warranty....31,967 miles ). I understand a similar problem occured in New Jersey although on the road and the driver had to be removed through the sunroof and the vehicle was totaled.

Filed May 1, 2023 · Brakes · NY

Suddenly had difficult time stopping the vehicle without "pumping" the brakes. Brake pedal went to the floor, and car would not hold stopped. There were no warning lamps during the 400 miles of driving from western NY to Michigan for a Holiday with family. Had this happened as I was waiting in line on the downhill side of the Blue Water Bridge in Michigan, it would have been quite difficult to keep in line, not touching the car in front of us. We felt lucky to have discovered the problem while going to run an errand later. We saw no external leaks to the brake system (no fluid leaking) while trying to investigate what could be happening. The problem was reported to me as a leak in the brake master cylinder which was replaced under warranty at a Toyota dealer in Grand Blanc MI. It took two weeks to get the vehicle repaired (which presented other challenges to us to deal with, as we were only visiting Michigan at the time). The vehicle had 12,600 miles on it at the time that the brakes stopped holding.

Filed Apr 26, 2023 · Brakes · NM

Driving home today, I felt that the brake was not performing properly. When I would stop at stop signs, slow down for traffic, or stop at red lights, the brake pedal felt spongey and the vehicle would not come to a complete stop. As I would step on the brake pedal, the vehicle would slow down, but continue to roll, while the pedal would continue to go farther and farther down until I could not press it any farther. When I made it home, I parked it in the garage, and even with the vehicle turned off, the brake pedal goes all the way to the floor.

Filed Mar 8, 2022 · Brakes · WA

Break problem after letting car sit overnight and coming up to a stop sign or anything slowly pedal goes to the floor If you pump tge pedal the brakes will come back and seem to work fine except when sitting In a drive-through line with your foot on the brake pedal it'll slowly lose brake pressure and you'll start creeping forward until the pedal starts going lower and lower And requires excessive pressure to hold vehicle stopped. It doesn't happen all the time but it is fairly consistent. Especially through the drive thru line is when you notice it Took to dealership dealership said there was nothing wrong with it

Filed Sep 13, 2021 · Body, Suspension · 185,000 miles · DC

The contact owns a 2003 Toyota 4Runner. The contact stated that while driving at limited speeds of 45 mph, the vehicle would wobble and swerve and was very unstable. The vehicle was taken to a Certified Auto Mechanic Shop and an independent mechanic who diagnosed that the failure was caused by severe rusting, perforation and corrosion of the rear subframe and suspension system. The vehicle was also driven to Muffler Shops in Bladensburg, MD on 8-20-2021, and on 10 -22-2021 to Hyattsville Toyota's Certified Toyota Collision Center for Repair Estimates of $4,000.00 and $7,268.00. The vehicle frame manufactured by Dana Holding Corporation which really requires fixing or replacing was not yet repaired. The Toyota manufacturer and local dealer Global Auto Outlet were notified of the failure. The approximate failure mileage was 1 85,000. The used vehicle was purchased from Global Auto Outlet in Temple Hills, MD for $9,552.24 on 8 -1-2019 with 175,000 miles on the odometer. The windshield had a crack in it, the air conditioning & emergency brake didn't work. The Complainant hadn't noticed the perforated excessive rust corrosion on the undercarriage of the vehicle until numerous months afterwards. Moreover, at the time of the purchase the Owner also didn't notice that the spare tire carrier was rusted, as well as undiscovered that the wrong size 265/65/17 spare tire it was held in was perforated and flat. After the purchase of the vehicle shortly later, the exhaust tailpipe rusted broke first and the muffler had to be replaced which costed $258.79. The Owner was nervously forced to operate a more than unsafe motor vehicle for up to 6 months.

Filed Aug 30, 2021 · Suspension · NY

Frame started excessive rusting before 2011 when the vehicle had very low miles on it. I reported it to Toyota National headquarters in 2016. They knew about it but since they didn't have to replace the frames they didn't care. They offered me $1000 towards a new car. I could not afford a new car. I have been battling the rust ever since. I spent $4000 in the past 2 years. I was driving with a broken front axle!! Recently the rust corroded my brake fluid lines causing the lines to fail all at once. Luckily I was leaving my driveway. I had no brakes and was headed for the road. I hit the emergency brake and stopped at the road. Brake fluid fell out all over my driveway. I had to spend $400 getting my driveway resealed and $300 for the new brake lines which was really cheap. I took the truck to Toyota to trade it in and they would only give me $1500 for the beautifully, well cared for truck with only 135000 miles on it because the frame was rusted. They replaced the frames on the Tundra and Tacoma, which were the same frames. They need to replace the frames on the 4Runners or compensate the owners like me. I am the original owner. I bought the dealers demo in 2005. I want the $10,000 they owe me. I am moving and I have to sell this truck, instead of waiting for Toyota to replace the frame, because it is unsafe to drive from NY to NC. I am very sad. Other than the rust this truck is fantastic. I feel like a good friend died! It hurts to let it go. I will have to sell it privately. I think $1500 from the dealer is criminal.

Filed Jul 29, 2021 · Body, Brakes · SC

Due to severe rust underneath the vehicle, there have been a few issues that have made the vehicle very unsafe to drive. Last week, both of my rear brake lines were completely done and leaking brake fluid leaving me with no brakes. This was due to rust and corrosion that had eaten the metal lines away. The radiator mounts are corroding, as well as the skid plate for my fuel tank and a few spots on my frame near the rear. I was not aware of the rust as I just got the vehicle a few weeks ago. I was driving in traffic when my brake light came on and I noticed my brakes didn't seem to be very effective and they eventually got the point where they were not working or slowing the vehicle at all. Once I took it to the shop and they put it on the lift, the mechanics pointed out just how bad the rust was.

Filed Jul 19, 2021 · Suspension · 93,000 miles · MD

The contact owns a 2005 Toyota 4Runner. The contact stated that upon taking the vehicle to an independent mechanic, she was informed that significant corrosion had developed on the front end of the undercarriage. The contact was then referred by the independent mechanic to the dealer where she was informed that while was rust found on the undercarriage of the vehicle, the vehicle was safe to operate and no repairs were needed. A month after the dealer inspection, the contact stated that an abnormal sound was coming from her brake pedal upon depression without warning. Once the contact made it home, she had the vehicle towed to an independent mechanic. The mechanic initially informed her that the vehicle was a total loss however, he and another mechanic were able to remove a large portion of the rust and replaced the brake pads, rotors, power steering line, hose, and brake pads. Recently, contact stated that her son had driven the vehicle and that the vehicle began to exhibit the same brake failure that had been replaced by the mechanic. The manufacturer was notified of the failure but offered no assistance. The vehicle was not repaired. The failure mileage was approximately 93,000.