Rusted brake lines after Sunframe rust. All E350 models are experiencing this issue with the rear brake lines and the dealership is charging upwards of $4300 to replace even when the subframe is already removed from the vehicle due to subframe issues
2013 Mercedes-Benz E-Class brakes problems
moderate 21 complaints filed with NHTSA · avg repair $450 · see brakes across all vehicles →
Complaints
21
Recalls
0
Avg fix
$450
The failure pattern owners describe
Buyer takeaway: The 2013 Mercedes E-Class has widespread reports of brake line corrosion and rust failure at relatively low mileage, with repair costs in the $3,000–$8,600 range. Additionally, owners report brake system failures with inadequate or no warning, and adaptive brake assist that engages harshly at low speeds.
The most consistent complaint across these 21 narratives is premature corrosion and rust failure of brake lines—particularly rear brake lines—in 2013 Mercedes E-Class models. Owners report severe rust and leaking at mileages ranging from 35,000 to 134,000 miles, on vehicles that are otherwise rust-free or well-maintained. Multiple owners cite repair costs between $3,000 and $8,600, and several note that dealers have told them this is an "ongoing problem" they see repeatedly on this model year. One owner points to a previously denied NHTSA defect petition (DP20-004) for an identical 2013 E350 brake line corrosion issue.
Beyond corrosion, owners report brake failure with no warning or late warning—in one case, complete loss of braking on the highway with no dashboard alert. One narrative documents a front brake line that rusted through and leaked brake fluid until the vehicle had "little to no braking ability," yet no warning light activated.
Two additional issues emerge: the adaptive brake assist system engages harshly and jerks the vehicle to a stop during slow, creeping maneuvers, which one owner reported to Mercedes-Benz headquarters; the company stated this is intentional design and cannot be changed. A single narrative describes the adaptive cruise control (Distronic Plus) triggering aggressive braking in response to phantom objects on an open highway.
Same Mercedes-Benz E-Class brakes reports on nearby years: 2010 · 2011 · 2012 · 2014
Failure modes owners describe
Corroded/Rusted Brake Lines
Brake lines corrode and rust excessively, leading to leaks and fluid loss. This occurs at relatively low mileage and on otherwise rust-free vehicles. Multiple owners report the same part failing across 2013 E-Class models, suggesting a material or design defect specific to this model year.
When: Various mileages reported: 35,000 miles (narrative #17), 37,000 miles (narrative #2), 54,000 miles (narrative #5), 106,352 miles (narrative #3), 120,000+ miles (narrative #10), 134,000 miles (narrative #11). Some failures occurring around 7–10 years after purchase.
Symptoms owners cite: Visible rust and corrosion on brake lines; Brake fluid leaks from corroded holes in lines; Loss of brake fluid level; Reduced or complete loss of braking ability; Check brake fluid level warning light; Brake pedal firmness reduced or pedal goes soft
Codes mentioned: Brake fluid level low warning
Repairs/costs cited: Replacement of brake lines required. Costs reported: $2,309–$8,614.50, with most in the $3,000–$5,000 range. At least one narrative (#4) notes that rear subframe replacement as part of a warranty extension does not cover brake line replacement, and the subframe must be dropped to access and replace brake lines, making combined work at independent shops cost-prohibitive. Some owners report dealers stating this is an ongoing problem they have encountered on multiple 2013 E-Class vehicles.
Recalls/TSBs owners mention: One narrative (#4) mentions a rear subframe warranty extension that does not cover brake lines. Narratives #6 indicates a previous NHTSA Defect Petition (DP20-004) for the same issue in 2013 E350 was denied in October 2020. Mercedes dealer personnel reportedly stated no technical service bulletin or firmware fix exists, and told one owner the adaptive brake assist behavior was by design.
Adaptive Brake Assist Harsh/Abrupt Engagement at Low Speed
The automatic adaptive brake assist system engages abruptly and jerks the vehicle to a stop during slow, creeping maneuvers (near zero speed). This occurs even when not in a panic scenario. The driver reports contacting Mercedes-Benz USA and the dealer; both stated the behavior is intentional and cannot be modified.
When: Ongoing issue; complaint filed after nearly three years of ownership.
Symptoms owners cite: Sudden, abrupt, jerky brake application at crawl speeds; Harsh stop triggered during slow, deliberate deceleration; Unintended brake engagement at imperceptible vehicle speeds
Repairs/costs cited: Owner inquired whether firmware adjustment could disable or modify adaptive brake assist at near-zero speeds; Mercedes-Benz dealer and headquarters stated no remedy is available, as the feature was intentionally designed.
Recalls/TSBs owners mention: Mercedes-Benz USA and local dealer confirmed the adaptive brake assist behavior is by design and stated they could do nothing to modify it.
Brake Failure—No Warning or Late Warning
Brake system failure without any dashboard warning, or with a warning that arrives only after significant brake fluid has already leaked. In one case, front brake line corrosion caused complete brake loss with no warning. In another, aggressive replacement of corroded front lines with nickel-copper lines was followed by rear brake line failure with no warning until fluid level dropped critically.
When: Narrative #5: 10+ years old, 54,000 miles; Narrative #8: leak discovered 6 months after initial line replacement, then rear line failure occurred shortly after.
Symptoms owners cite: Complete or severe loss of braking ability while driving; No warning light or warning arrives too late; Brake pedal unresponsive or goes to floor; Delayed warning light ('Check Brake Fluid Level') appearing only after loss of braking
Codes mentioned: Brake fluid level low (warning comes late or not at all)
Repairs/costs cited: Narrative #5 documents that the car lost nearly all braking ability due to corroded front brake line with no computer warning. Narrative #8 describes replacement of corroded driver-side brake line with nickel-copper lines, but shortly thereafter rear brake line began leaking, again with no advance warning.
Recalls/TSBs owners mention: Narrative #5 notes that the dealer verified the computer warning did not activate despite complete brake fluid loss. No recall or technical service bulletin cited for this failure mode.
Adaptive Cruise Control (Distronic Plus) False Object Detection and Unintended Braking
The adaptive cruise control system detects phantom objects or vehicles where none exist, resulting in unwanted brake application, sometimes aggressive. This occurs on open highway with clear visibility ahead.
When: Reported during highway driving at normal cruising speeds.
Symptoms owners cite: System falsely detects vehicles or obstacles ahead; Unintended deceleration without warning signal; Aggressive braking triggered for no apparent reason; Braking warning signal followed by sudden deceleration
Brake Sensor/Response Failure
Brake pedal depression does not produce expected braking response. One narrative reports the brake pedal was depressed but brakes did not respond; dealer diagnosed a faulty brake sensor requiring replacement.
When: Failure mileage approximately 120 miles (likely data entry error; vehicle is 2013 model with this reported mileage in narrative #10).
Symptoms owners cite: Brake pedal depressed but brakes do not respond; No braking action despite pedal application; Failure occurred repeatedly (five times noted)
Repairs/costs cited: Brake sensor replacement required; vehicle was not repaired at the time of complaint.
Synthesized from 21 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
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Common questions
How serious is the brakes problem on the 2013 Mercedes-Benz E-Class?
It's a documented issue but not catastrophic. 21 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 21 complaints filed, brakes issues most often appear around 52,445 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/2013/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.