- On 12/28/2023, Car developed a brake fluid in the rear near the differential after sitting, unused, for 3 weeks. - Car is available for inspection. - Brake system operates with diminished capacity. - An appointment has been scheduled with an independant repair center. - The brake warning light illuminated and a brake fluid warning message appears when the vehicle is started.
2014 Mercedes-Benz E-Class brakes problems
moderate 38 complaints filed with NHTSA · avg repair $450 · see brakes across all vehicles →
Complaints
38
Recalls
0
Avg fix
$450
What stands out
Owners have filed 38 brakes complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Among the 10 model years of Mercedes-Benz E-Class in our records for brakes problems, this one ranks #3 by owner-complaint volume.
The failure pattern owners describe
Buyer takeaway: Brake line corrosion is a widespread systemic failure on 2014 E-Class models, striking between 43,000 and 130,000 miles and creating genuine loss-of-brakes hazard during operation. Repair costs run $1,200–$4,500 at dealerships, and while Mercedes extended warranty coverage to the related rear subframe issue, brake lines remain excluded despite owners' documented safety complaints.
Owners of 2014 Mercedes-Benz E-Class models consistently report severe corrosion of rear brake hardlines that leak fluid and compromise stopping power. The failure starts early—as low as 43,000 miles—with corrosion visible and spreading over years before catastrophic rupture occurs. Several owners describe losing brakes mid-drive: pedal went to floor, warning light came on, fluid drained from a ruptured line. One owner's brakes failed at 50–55 mph. Multiple owners note corrosion is concentrated at plastic clip attachment points where the enamel coating wears through.
The root cause points to design defect. Owners and mechanics report the lines use inferior enameled steel rather than corrosion-resistant cupronickel; replacement parts Mercedes now supplies use cupronickel, proving the original material choice was inadequate. Dealers acknowledge performing multiple rear brake line replacements per week on this platform. Corrosion spreads from the rear subframe area, where Mercedes extended warranty coverage after lawsuits—but deliberately excluded brake lines despite their linked corrosion origin.
Repair costs run $1,200 to $4,500 at dealerships because the entire rear brake line assembly must be replaced; partial repairs are impossible. Several owners found independent shops cheaper. The safety risk is real: brake failure without warning creates life-threatening stopping distance loss. Owners universally view this as a manufacturer defect, not wear-and-tear, and expect coverage matching the rear subframe warranty extension.
Same Mercedes-Benz E-Class brakes reports on nearby years: 2011 · 2012 · 2013
Failure modes owners describe
Rear brake line corrosion and rupture
Enameled steel rear brake hardlines corrode and leak brake fluid at attachment points and throughout their length, causing loss of braking pressure and potential brake failure. Owners report the lines rust far earlier than expected for a premium vehicle, with damage concentrated in the rear subframe area where plastic clips wear through protective enamel. Mercedes design uses inferior enameled steel instead of the cupronickel material now used for replacements.
When: Reported between 43,000 and 129,000 miles, with corrosion visible as early as 55,000 miles. Failures occur within 8–9 years of ownership.
Symptoms owners cite: Brake fluid leaking from rear brake lines; Low brake fluid warning light illuminates; Brake pedal becomes spongy or sinks to floor; Loss of braking power while driving; Extended stopping distance; Visible rust and corrosion on hardlines at clip attachment points; Brake fluid pooling under rear of vehicle
Repairs/costs cited: Repair requires replacement of entire rear brake line assembly; cannot repair failed sections only. Labor intensive because rear subframe must be removed. Replacement costs reported between $1,200 and $4,497 at dealership. Independent shops perform repairs at lower cost. Replacement lines now use cupronickel material. Some owners have had multiple rounds of dealer warnings before corrosion worsens enough to cause failure.
Recalls/TSBs owners mention: Mercedes extended limited warranty coverage to rear subframe corrosion (NHTSA DP20004 recall/warranty program), but deliberately excluded brake lines from this coverage despite them corroding from the same root cause. Owners report dealers acknowledge multiple repairs per week for this issue on W212 platform. Dealer service reports state metal is inferior and prone to premature corrosion. Replacement parts switched to cupronickel, proving Mercedes recognized the original design defect. Customer service has rejected warranty extension requests, citing insufficient undercoating rather than design fault.
Rotor rust and surface degradation
Brake rotors develop rust and surface scoring after vehicle sits idle for extended periods (12 weeks or more), particularly in winter conditions. Rust causes rotors to deform and score, creating pulsation when brakes are applied.
When: After 12+ weeks of idle storage, particularly during winter months.
Symptoms owners cite: Brake pulsation while braking; Visible rust on rotor surface; Rotor surface scored and deformed by rust
Repairs/costs cited: Rotor replacement required. Dealers report replacing rotors on used vehicles from their lot that have sat for several weeks in winter. Dealers classify rotors as wear-and-tear items and deny warranty coverage.
Recalls/TSBs owners mention: Dealers refuse warranty coverage, treating rust-damaged rotors as normal wear despite this being a recurring issue.
Parking brake (emergency brake) sticking and failure to release
Parking brake assembly fails to release smoothly or becomes stuck in engaged position, particularly in cold weather. Repeated manual intervention required to release.
When: Can begin as early as 28,000 miles. More frequent in cold conditions.
Symptoms owners cite: Parking brake does not disengage when lever is operated; Repeated attempts needed before brake releases; Brake stuck even while driving vehicle; Pedal assembly mechanical failure
Repairs/costs cited: Parking brake pedal assembly replacement performed by independent mechanic. Manual intervention (pushing behind brake to return to release position) provides temporary relief.
Brake booster noise and soft pedal feel
Brake booster develops squealing and squeaking noises. Brake pedal loses firmness.
Symptoms owners cite: Squealing or squeaking from brake booster area; Brake pedal feels soft or loses firmness
Synthesized from 38 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
brake line failed the hard line. lost my brakes . Mercedez Ralley Motors of Roslyn N.Y said that it was normal rust . there was no warning before the failure.
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
Had brakes trouble with your 2014 Mercedes-Benz E-Class?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the brakes problem on the 2014 Mercedes-Benz E-Class?
It's a documented issue but not catastrophic. 38 complaints have been filed. Repairs average $450 and most owners catch it before it causes a breakdown.
At what mileage does the brakes typically fail?
Based on the 38 complaints filed, brakes issues most often appear around 72,750 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $450 for brakes repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to brakes?
No active recalls currently cover brakes issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2014/Mercedes-Benz/E-Class.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.