Audi A4 brake failure problems

Filed Dec 3, 2025 · Acceleration, Brakes · FL · crash

As I was pulling into a parking spot, traveling at a low speed I naturally applied the brakes but the car accelerated instead jumping a concrete curb and hitting a wall. In that moment I realized I had no control of the vehicle. This sudden unintended acceleration was accompanied by a loss of braking. Pressing on the brakes harder did not stop or slow the car. Brake and accelerator failed. The vehicle is available for inspection. Thankfully the car hit a wall, and there was no injury to myself or others. The parking spot is positioned in front of a concrete wall. The problem has not been confirmed by the dealer as of yet. No warning lamps, message or other signs of malfunction were evident.

Filed Jun 5, 2015 · Acceleration · 95,000 miles · MI

As I was driving the gas pedal went to the floor full throttle. I almost had an accident. I final got the car over to the road at a stop by putting the car in neutral. The engine revved up as high as it could go. So I cut the car off then cut it back on and it continued to have the same problem. It took 3 times of cutting the car off and waiting a few minutes before the car returned to normal.

Filed Aug 9, 2014 · Brakes · 121,000 miles · CA · crash

Brakes were working fine, coming off freeway, was coasting thru light, traffic stopped, brakes no longer worked, brake pedal was suddenly flush with floor. Rearended a car, car started jumping forward. Had to use the emergency brake to stop the car. Car was towed after accident, not because it was not drivable, it was not drivable due to brake problem. Repair shop said brakes failed to vacuum hose breaking, no warning prior to losing brakes.

Filed Feb 24, 2014 · Brakes · OH

As I approached a stop sign on the morning of tuesday, february 18th I went to use the brakes and the pedal was extremely hard. It wouldn't press down at all. I ended up running through the stop sign and coasting in to a parking lot where I turned the car off and on a number of times and engaged the emergency brake. The brake was still hard every time. I called audi experiences and by the time I had explained what happened the brakes began to work again. (for 15 minutes the brakes did not work!) I continued to drive the car that day but at a cautious speed. Later that evening, around 8:50pm, I was driving home and again, the brakes refused to work, same hard pedal as earlier that morning. I called audi experiences and scheduled a tow pick up. Audi services says that a vacuum hose has been damaged and causes the hose to collapse on itself causing the brakes to "lock up." they want to repair the same hose and use it again. It definitely needs replaced with a thicker hose that isn't going to collapse on itself and cause this to happen again. I believe this is a faulty hose and needs to be looked into. I have found a number of other people who have had the same issue happen to them. Luckily I was not hurt and didn't hurt someone else.

Filed Jan 31, 2014 · Brakes · 70,000 miles · CO

Tl* the contact owns a 1997 audi a4. The contact stated that while driving approximately 20 MPH, the brakes failed when engaged. The contact was attempting to stop for a traffic stop but the vehicle did not respond. The failure was recurring. The vehicle was not diagnosed or repaired. The manufacturer was not notified. The failure mileage was 70,000.

Filed May 22, 2010 · Acceleration · 75,000 miles · AZ

Sudden acceleration. I was coming back from the store, and twice I stepped on the gas and the pedal went to the floor on its own! I hit the brake and kept the car from running away while I pulled the pedal up with my other foot. When I got back home, I put it in neutral, gave it a little gas, and it went into full acceleration. I could feel the gas pedal pull away from my foot and go to the floor. I had to turn the key off to stop it. It was not "floor mats" or driver error. The next day, the problem was gone. I drove to the audi dealer. They replaced the gas pedal assembly and the problem appears to be fixed.

Filed Feb 26, 2008 · Brakes · 87,000 miles · WA · crash

While pulling into the driveway, the brakes failed. The pedal locked up and would not move. There was no braking force at all. I attempted to engage the emergency brake but was unable to before the car crashed into the back of the garage, causing significant damage to the car and the house. The car is currently in the body shop and will then be sent to the mechanic for diagnostic and repairs.

Filed Mar 17, 2007 · Airbags, Brakes · 15,158 miles · FL · crash

Audi a4 cabriolet. On may 2006 the air bag warning light was on and brought to the dealer for repair. On september 2006 the air bag light and the brake warning light were on and brought to the dealer for repair. On november 10 I had an accident due to a brake failure driving at 15 MPH exiting the highway. Manufacturer rejects a failure of brakes testing the car static at body shop. At crash , the driver airbag did not deployed, there was no passenger but the passenger air bag deployed. Roll over protector ejected even with no intention to roll. 2- failures and repeated malfunctioning lead to accident even manufacturer denies any problem, my belief is that car is unsafe to drive. I have read other same problems in this dot site. 3- first 2 times repair shop stated a repair. At the moment car is being repaired already 4 months. Many irregularities with service and repairs while at dealers and sub contractors trusted repair shops.

Filed Oct 24, 2005 · Brakes · 83,850 miles · CO

Abs brake failure resulting in unsafe ABS brake function. Need to replace ABS control module. This is a recurring problem based on a search of the internet.

Filed Jul 26, 2005 · Brakes · 33,000 miles · MA

Front brake failure. Out of four pad/shoes, 3 pads physically separated off of their respectivie shoes. One of the three actually came out during driving. When this occured, I temporarily lost braking ability as the brake pedal went to the floor without providing any decelaration. Car needed to be towed to the dealership as it became usafe to drive. The remaining pad/shoe that was not separated was in reaonable condition measuring 7.7mm (out of 10mm). The two remaining separated pads are chipped showing major delamination and major degredation. Remaining pads & shoes have been saved. Brake pads/shoes & rotors were replaced by ira audi 97 andover street danvers, ma 978‑739‑8806 this appears to be a catastrophic product failure once the pad lets loose completely. Events leading up to failure: about a week before, I was hearing a thunk sound when the car would change from reverse to forward motion. This occured only after the vehicle was sitting overnight.