2012 Mercedes-Benz E-Class Brakes

I recently took my 2012 Mercedes-Benz E350 to an authorized Mercedes-Benz dealership after experiencing corrosion of the rear subframe. The dealership confirmed and is servicing the vehicle under an active recall notice that extended the original New Vehicle Limited Warranty from 4 years/50,000 miles to 20 years /unlimited miles. After removing the subframe for repair, they observed serious corrosion of the brake lines. There had been no warnings or symptoms to alert me to any corrosion problems with the brake line prior to this. Most likely, the issue would not have been discovered if the dealership had not removed the subframe. The dealership advised me that this issue requires immediate service due to safety concerns (potential failure) as the braking system could fail while driving the vehicle. The cost to have the work done is $5800. Beyond the dealership service center, I'm not aware if brake line has been inspected by others (engineers) in Mercedes-Benz. However, this issue appears to be frequently observed in vehicles experiencing the rear subframe corrosion issue.

2012 e350 both rear brake metal lines rusted out January 2025 brakes gave out. This is definitely connected to the rear subframe rusting too.

Rusted/leaking brakes lines to rear of vehicle.

The rear brake lines on my 2012 Benz E350 has a lot of corrosion and one of the blowout while stopping from 25mph to a complete stop. Upon further inspection, it was completely rusty in many places. Mercedes needs to address this issue because its unsafe rather danger to drive.

BRAKE LINES TO THE REAR HAVE CORRODED AND CAR CAN NOT BE DRIVEN.

Brake line corroded under protective cover. Was driving and felt mushy brakes and came home to almost no brake fluid. Found leak under driver side door. Kind of weird because it’s under a cover.

My car had a pool of brake fluid under the car and when I turned it on, it said the brake fluid was low. When I went to check the reservoir it was empty. The underpanels were removed and the brake lines were rotted out in several areas. I was shocked because my car is in mint condition and I have always avoided taking it out when the roads are salted in the winter. I am lucky this happened when the car was parked. This has never happened to the cars in my family which were never treated with as much care.

RUSTED BRAKE LINES CAUSING BRAKE FLUID LEAKING AND LOOSE BREAK PEDAL. THIS IS SEVERELY AFFECTING BREAK SYSTEM PERFORMANCE AND VEHICLE SAFETY. MB DEALER QUOTED $2910.00 PLUS TAX FOR REPLACEMENT.