2014 Mercedes-Benz E350 Brakes Problems

The failure was when I hit the brakes hard in an emergency braking situation and the car very eratically and violently veered to the left. There was no warning and thank God there was no car coming in the left lane otherwise it would have been a broad side hit. I was doing 55 mph. We had the car inspected at a local shop and the left rear tie rod link was completely severed from the suspension sub-frame because of rust. The brake lines above the sub frame were also severely rusted and leaking. I called my closest dealer and they said the rusted frame replacement is covered under extended warrenty but not the brake lines which had the same issue, severe corrosion and a potential catostrophic failure! Mercedes Road Side Assistance was called to tow the car 70 miles to the closest shop.

NHTSA ID

11752742

Incident

Jul 18, 2026

Vehicle subframe corrosion (manufacturer extended warranty offered). Rear brake lines corroded/leaking. Vehicle leaks fuel; steel fuel line corroded. Vehicle has about 105k miles. Minor fire started when yard maintenance came in contact with fuel saturated ground where vehicle had been parked/moved out of the way just prior. With rear suspension subframe springs corroded, vehicle bottom can contact road surface while driving, scraping steel exhaust with fuel present. EXTREMELY dangerous. Local Sunbury Ohio Mercedes dealership inspected then offered subframe replacement. Stated it was leaking fuel and not hydraulic fluid we originally thought. Brake, suspension and fuel line corrosion repairs were quoted in excess of $4,000, which was a "great deal" according to them "because the subframe would already be removed and would make it much easier."

NHTSA ID

11749054

Incident

Jul 6, 2026

Brake line failure. Front section of the line that feeds the rear wheels leaked while traveling. Warning light came on. Purchased brake fluid and drove to local service provider. The rear section left to right above subframe was found to be rotted, but not leaking yet. Local service provider replaced front and rear brake lines.

NHTSA ID

11731615

Incident

Apr 1, 2026

Brake lines leaking because corrosion under frame from ABS module which is essential a safety aspect that should not be happening.

NHTSA ID

11714883

Incident

Feb 1, 2026

2014 Mercedes e350 these models as well as those from2009-2015. Have recall on subframe but the brake lines rust out and deteriorate as mine has now done. If you go on line you tube etc. you will see the issue and all complaints. I had my subframe replaced under warranty at Mercedes of flemington. About 1 1/2 years ago. While it was being serviced they asked me if I wanted to replace brake lines for $1200 since they had this part out job would be easy. So this means Mercedes is well aware of the deterioration of these line the man at mb said the metal was inferior and this is result. On YouTube it was stated that individuals took mb to court or accountability for this but results were negative. Yet problem exists. If you breaks fail while driving it is very dangerous. Also I believe there is a recall for gas lines for my model 2014 manufactured from June and July. The brake lines on my vehicle are rusting as is gas tank. This also is dangerous condition should accidents occur the lines because compromised with rust can much easily rupture causing fuels to spew out causing possible explosive condition. I have pictures and can forward

NHTSA ID

11693371

Incident

Oct 8, 2025

vehicle rear brake lines are corroded and leaking, while no corrosion was observed on surrounding parts

NHTSA ID

11685563

Incident

Sep 4, 2025

Rear’s brake line leaking brake fluid and car will not stop ;the rears brake line is all rusted the car only has 65 k miles and garage all it life It’s a very serious safety issue thanks for taking this e mailed [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11675563

Incident

Jul 21, 2025

The rear brake lines, along with the rear subframe have experienced severe rust and corrosion.

NHTSA ID

11666120

Incident

Jun 5, 2025

Driving home on a 30MPH street, had the brake light go on and felt the brake petal sink to the floor when I had to stop. Very concerning was grateful I wasn’t going faster. Cautiously made it home, and when I took it to the shop, they diagnosed that the brake lines had corroded. This is a huge safety concern and should be a recall as it could be fatal in certain circumstances.

NHTSA ID

11645672

Incident

Sep 18, 2024

Rear brake lines have rusted out causing a safety concern. Mercedes will not extend the warranty to repair the recognized inferior parts as they did for the rear subframe. The rusty rear brake lines are related to the rusted subframe which was repaired under extended warranty by Mercedes at no cost. The same should apply to the rear brake lines. I am currently having the rear brake lines replaced due to this rust and safety issue. Please require Mercedes to extend the warranty and related repair to the rear brake lines as it is systemic to these cars.

NHTSA ID

11633802

Incident

Jan 3, 2025

The emergency brake often gets stuck, especially on cold days. I have to repeatedly push and release it or manually adjust it by pushing behind the brake to return it to the release position. This problem starts on 28000 Mile on this car

NHTSA ID

11630672

Incident

Dec 13, 2024

10/14/21 Was cautioned that the rear brake lines and caliper hoses were very corroded. Mileage 43,185 10/19/22 Cautioned about rear brake lines. Mileage 48,459 12/11/23 Rear brake lines replacement cost $4497. Repair not done at that time. Mileage 53,375. Again cautioned. 10/30/24 service date- Was informed that the rear subframe was corroded and would be replaced by Mercedes-Benz. I have photos from the dealer. There are holes in the rear subframe.The brake lines could be replaced at the same time at a cost of $2820 due to the fact it is in same area. Mileage 58,597 I asked M-B Customer Service to cover the rear brake lines as the under coating was not sufficient to protect the rear subframe and brake lines. They rejected my claim. I was told others have also tried to get M-B to cover this cost and were rejected. My vehicle has very few miles for its age. I have never had to replace rear brake lines in the 40 years I have owned a Mercedes Benz vehicle. I believe that they have not adequately protected the undercarriage from weather. The rear subframe is my evidence. At some point these brake lines could fail. They will be replaced. I want the manufacturer to cover the cost of the brake lines when the rear subframe is replaced. Please advise.

NHTSA ID

11626569

Incident

Oct 14, 2021

Rear brake line corrosion

NHTSA ID

11622814

Incident

Oct 27, 2024

2014 Mercedes E350 with 129,000 miles. It was discovered recently that the subframe was rusted, and a hole had formed. The subframe was replaced under extended warranty offered by Mercedes. During the replacement, the dealership discovered that the metal rear brake lines are also rusted.

NHTSA ID

11618830

Incident

Oct 7, 2024

Brake pedal became "spongy" and then total brake failure with dashboard warnings to check brake fluid. Caused by corroded brake lines that failed and allowed all brake fluid to be lost in the system. Extremely dangerous as no braking was available.

NHTSA ID

11616132

Incident

Sep 19, 2024

Rear brake lines rusting and corrosion.

NHTSA ID

11614148

Incident

Sep 2, 2024

Rear subframe snapped under hard braking on the highway and caused my to veer into leftmost lane. It was terrifying and a severe hazard on the highway. Had vehicle towed to my house. I lifted and inspected my car and found the rear subframe was rusted and a crack straight through. The rear brake lines were also severely corroded and are very close to failing. Front brake lines have no corrosion. It seems that the rear subframe and rear brake lines have the same anti rust coating which are clearly not sufficient.

NHTSA ID

11609273

Incident

Aug 18, 2024

The rear brake lines on my 2014 Benz E350 was blowout while stopping at a traffic light. After inspection, the both rear brake lines were rusted

NHTSA ID

11602000

Incident

Jun 4, 2024

Rear subframe rusted was covered under an extended warranty (after a lawsuit), but the rear brake lines are also very rusted and not covered by warranty. Rear springs also broken (rusted) and bolts seized.

NHTSA ID

11594841

Incident

Jun 17, 2024

All of a sudden my brake error lights went on while driving to work. By the time I could stop at a garage on the way my brake fluid was very low and more was added. Had to again add more when I got home just so I could take the car to my repair shop. Independent repair specializing in mercedes identified 4 leaks in rear brake lines. Pictures show that all leaks are at or adjacent to clips attaching to the car. Something is wrong with the design or materials for this to happen consistently in the same car. Mechanic said this isn't expected until cars get at least 100k and shouldn't be consistently in the same connections. The fluid was draining so fast that if someone were driving a longer distance they may not have the ability to refill before brake failure. This is a safety hazard to have so many material failures at the same area of the brake lines.

NHTSA ID

11591565

Incident

May 30, 2024

Suspension Rear Sub-frame rusted through, rear Lower control arm disconnected from rear sub-frame due to rust/corrosion. It is available for inspection. While braking at highway speeds the car fishtailed and I almost lost control of the vehicle. This has not been confirmed or inspected by any service, Insurance or Police entity. No warning lights, messages etc. Brakes: Rear brake lines are severely corroded in the same area as the rear sub-frame. Electrical System: Battery continuously discharges and is dead after 5 hours.

NHTSA ID

11590808

Incident

May 15, 2024

I am losing brake fluid. Likely from rotted brake lines. Was given a quote attached below for repair of rotten brake lines 2 years ago. My friend has the same vehicle (a 2014 model) and had to replace brake lines for the same issue. I've never heard of break lines rotting and leaking on another make of vehicle after only 8 years of use at 70K. The car is always garaged, washed weekly and currently at 91K miles. I believe the coverage of the rear subframe should be extended to the break lines for this model of vehicle since it is a commonly reported problem per the dealer.

NHTSA ID

11587660

Incident

Sep 14, 2022

Brake line failure , i have a 2014 E350 that the rear brake lines failed , all rusted and corroded , mercedes should extend the warranty on brake lines as they did with the subframe , this is a major safty concern , when you buy a mercedes you expect you are buying a top of the line car not all plastic .

NHTSA ID

11583965

Incident

Apr 17, 2024

The contact owns a 2014 Mercedes-Benz E350. The contact stated while driving 50-55 MPH and depressing the brake pedal, the brake pedal went down to the floorboard and the vehicle failed to respond as needed, causing a stopping distance delay. The message "Low Brake Fluid" was displayed. The vehicle was taken to an independent mechanic, where it was diagnosed that the rear metal brake tubes were corroded, which caused brake fluid to leak. The mechanic replaced the rear brake tubes. The vehicle was repaired. The dealer and the manufacturer were not notified of the failure. The failure mileage was approximately 59,000. The VIN was not available.

NHTSA ID

11580602

Incident

Mar 28, 2024

Mileage

59,000 mi

Rear brake lines are rusting out prematurely caused by a defective rear sub frame

NHTSA ID

11567635

Incident

Jan 24, 2024