The contact owned a 2012 Mercedes-Benz E550. The contact stated while her husband was driving 20-25 MPH and making a right turn, the brake pedal was depressed but traveled down to the floorboard, and the vehicle failed to respond. The contact's husband stood on the brake pedal; however, the vehicle failed to respond and crashed into a small ditch. The contact was occupying the front passenger's…
2012 Mercedes-Benz E-Class brakes problems
severe Owners of the 2012 Mercedes-Benz E-Class have filed 12 NHTSA complaints about the brakes at roughly $450 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See brakes across all vehicles →
Complaints
12
Recalls
0
Avg fix
$450
| Model year | brakes complaints |
|---|---|
| 2010 E-Class | 11 |
| 2011 E-Class | 12 |
| 2012 E-Class (this page) | 12 |
| 2013 E-Class | 21 |
| 2014 E-Class | 38 |
| 2015 E-Class | 5 |
1crash
1injury
The failure pattern owners describe
Owners of 2012 Mercedes-Benz E-Class models report recurring brake system failures centered on corroded and rusted brake lines. The most severe case involved a complete loss of braking at 20–25 mph during a right turn; the brake pedal traveled to the floorboard with no response, and the vehicle crashed into a ditch, injuring the passenger and totaling the car.
More commonly, owners report brake lines corroding and rusting out from the booster to the rear calipers, sometimes under protective covers, causing brake fluid leaks. One owner discovered an empty reservoir; another felt mushy brakes and found nearly no fluid remaining. A brake line blowout occurred during braking at 25 mph. The corrosion is strongly linked to rear subframe rust, and one owner noted this is the third E-Class he's owned with the same issue.
When discovered during subframe work, dealers quoted $2,910–$5,800 for brake line replacement. Loose brake pedals and delayed return to position accompany the leaks. Owners say they drive carefully and avoid salted roads, yet brake line corrosion still occurs. Mercedes extended the rear subframe warranty to 20 years/unlimited miles but does not appear to extend coverage to brake lines positioned directly above the corroded subframe.
Same Mercedes-Benz E-Class brakes reports on nearby years: 2010 · 2011 · 2013 · 2014
Failure modes owners describe
Brake pedal loss of function — full descent to floorboard
Brake pedal depressed completely with no stopping response; vehicle unable to decelerate or stop.
When: Unknown mileage
Symptoms owners cite: Brake pedal travels to floorboard; Vehicle does not respond to brake input; Complete loss of braking; Airbags deployed on impact
Repairs/costs cited: Vehicle totaled; no repair attempted
Recalls/TSBs owners mention: Manufacturer notified; field inspection advised
Brake line corrosion — leaking fluid and system failure
Brake lines rust out or corrode, allowing brake fluid to leak. Lines reported rusty under protective covers and in multiple locations from booster to rear calipers. Corrosion linked to rear subframe rust condition.
When: 160,000 miles reported in one case; timing ranges from preventive discovery during subframe work to active failure
Symptoms owners cite: Brake fluid puddle under vehicle; Low or empty brake fluid reservoir; Mushy brake pedal feel; Brake pedal does not return to original position; Loose brake pedal; Brake fluid leak; Visible corrosion and rust on brake lines; Brake line blowout during braking
Repairs/costs cited: $5,800 quoted for brake line service after subframe removal; $2,910 plus tax quoted by MB dealer for replacement; one owner stated repairs never completed
Recalls/TSBs owners mention: Extended New Vehicle Limited Warranty from 4 years/50,000 miles to 20 years/unlimited miles for rear subframe corrosion; dealership noted corrosion is frequently observed in vehicles with rear subframe issues
Brake pedal abnormal feel and return failure
Brake pedal feels loose and fails to return to normal position after depression; often accompanied by brake fluid leak.
When: 160,000 miles in one documented case
Symptoms owners cite: Brake pedal feels abnormally loose; Brake pedal fails to return to original position after depression; Mushy brake feel
Repairs/costs cited: Independent mechanic inspection noted subframe rust; dealer inspection scheduled but vehicle not repaired
Recalls/TSBs owners mention: Manufacturer made aware of failure
Synthesized from 12 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Had brakes trouble with your 2012 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 2012 Mercedes-Benz E-Class?
It's a meaningful issue. 12 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $450.
At what mileage does the brakes typically fail?
Based on the 12 complaints filed, brakes issues most often appear around 112,500 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/2012/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.