Brake lines, also called brake hoses, are reinforced rubber tubes made to withstand extreme hydraulic pressure and heat. They link the brake caliper to the rigid metal brake lines from the master cylinder, and must be flexible to allow the front wheels to turn.
What are the symptoms related to a bad brake line?
When a brake line fails, you may notice a sharp loss in braking power, the vehicle pulling to one side while braking, the brake pedal feeling soft, or a complete loss in braking power. In the event of a brake line bursting, the brakes will not "pump up" if you repeatedly press the brake pedal. Instead, the pedal will feel lighter with every push.
Learn more about brake hose symptoms
Can I drive with a brake line problem?
It is not safe to operate a vehicle with a braking problem. If your car is having problems stopping, it puts your life and the lives of others at risk.
If there's any sign that the brakes are not performing like they should, have it towed to a repair shop as soon as possible.
How often do brake lines need to be replaced?
Brake lines fail due to age more than mileage, and typically a vehicle needing new brake lines have passed the 100,000-mile mark.
How are brake line issues diagnosed?
When inspecting the brakes, the technician will look for cracking in the brake line. When the brakes are applied, the brake line will swell under hydraulic pressure if they're going bad. Another sign is if the brake line is leaking brake fluid.
How is a brake line replaced?
Disconnecting the brake line, and connecting the new line takes just a few moments, but the system must be flushed to remove any contaminants or debris left behind by the old brake line. The system then must be bled of air.
When a brake hose is replaced due to the age and condition of the hose, all the brake hoses should be inspected and replaced if needed.
We recommend having the brake hydraulic system flushed any time a component in the hydraulic system is replaced or if the hydraulic system is opened.
RepairPal recommendations for brake line issues
If a brake line fails due to deterioration, the others will probably fail soon afterwards. Replacing them all at once may prevent a future visit to a repair facility. At the very least, the other brake lines should be inspected when replacing one of them. We recommend using high-quality or OEM brake lines.
The metal brake lines on a vehicle rarely need service, but they can become corroded if the brake fluid is not changed on schedule. Salty road conditions can also cause exterior rust that can lead to failure.
Can I replace the brake hose myself?
The braking system can be maintained by a DIYer with plenty of knowledge of hydraulic systems. But if you don't have deep knowledge of braking systems, this repair should be left to a professional, as your safety depends on it.
BMW 335d Brake Hose Replacement Cost by Year
The average cost for a BMW 335d Brake Hose Replacement is between $472 and $623 but can vary from car to car.
