BMW 330i Brake Master Cylinder Replacement Costs

Estimate price near me

Service Location

Customer Ratings

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

See availability

Customer Ratings

Brake Master Cylinder Replacement Service

How much does a Brake Master Cylinder Replacement cost?

On average, the cost for a BMW 330i Brake Master Cylinder Replacement is $341 with $159 for parts and $182 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2017 BMW 330iL4-2.0L Turbo	Service typeBrake Master Cylinder Replacement	Estimate$1178.48	Shop/Dealer Price$1416.86 - $2119.04
2003 BMW 330iL6-3.0L	Service typeBrake Master Cylinder Replacement	Estimate$506.99	Shop/Dealer Price$590.46 - $831.49
2006 BMW 330iL6-3.0L	Service typeBrake Master Cylinder Replacement	Estimate$815.24	Shop/Dealer Price$965.86 - $1406.01
2005 BMW 330iL6-3.0L	Service typeBrake Master Cylinder Replacement	Estimate$506.99	Shop/Dealer Price$590.51 - $831.58
2018 BMW 330iL4-2.0L Turbo	Service typeBrake Master Cylinder Replacement	Estimate$1120.27	Shop/Dealer Price$1357.22 - $2058.33
2001 BMW 330iL6-3.0L	Service typeBrake Master Cylinder Replacement	Estimate$506.99	Shop/Dealer Price$590.83 - $832.14
2004 BMW 330iL6-3.0L	Service typeBrake Master Cylinder Replacement	Estimate$506.99	Shop/Dealer Price$590.55 - $831.65
2002 BMW 330iL6-3.0L	Service typeBrake Master Cylinder Replacement	Estimate$506.99	Shop/Dealer Price$590.51 - $831.58

Show example BMW 330i Brake Master Cylinder Replacement prices

What is the brake master cylinder and how does it work?

The brake master cylinder has a piston that pressurizes fluid in the brake lines to each wheel cylinder as you apply force to the brake pedal. That pressure moves the pistons that are in the wheel cylinders. As the pistons in those wheel cylinders move, they force the brake pads or shoes tightly against the rotors or drums allowing the car to stop quickly.

The size of the pistons in the master cylinder and in the wheel cylinders are carefully selected when designing a car. This allows drivers to apply moderate pressure on the brake pedal when stopping, but creates tremendous pressure applied at the wheel cylinders. A car can then stop quickly even at high speeds. Depending on how much force is applied to the brake pedal, the pressure in a car’s brake lines will typically be in the range of 800 PSI to 2,000 PSI.

Master Cylinder

When to replace the master cylinder?

External fluid leaks. There should be no fluid visible on the external surfaces of any portion of the master cylinder or the plastic fluid reservoir.
Low, slowly falling, or spongy brake pedal. Faulty internal seals on the piston can cause internal leaks and also seepage of brake fluid into the power assist brake booster. Internal leaks will typically be accompanied by a low pedal, a spongy brake pedal, or a pedal that slowly sinks as you maintain pressure. In all cases, you will experience reduced braking abilities.
Discolored brake fluid. No brake fluids, other than those specified for the year, make, and model, are fully compatible with a car’s internal rubber seals in the master cylinder. Discoloration of brake fluid can also occur due to moisture and particulate contaminants in the fluid.
Warning lights on the dash. If the brake system warning light illuminates, there are several potential causes but failure of the master cylinder is in the list of causes that would have to be investigated.

How do mechanics replace the brake master cylinder?

On vehicles with power brakes, the master cylinder is bolted to the metal housing of the power brake booster. There is usually an electrical plug connecting to a brake fluid level sensor on the master cylinder reservoir and that plug must be disconnected.
Once all steel brake lines are disconnected from the master cylinder, the master cylinder is unbolted from the brake booster and removed from the vehicle.
The new master cylinder must be bench-bled to expel air from internal passages that contain the piston. Then the new master cylinder is bolted to the brake booster and the brake lines are reattached. The electrical plug for the fluid level sensor is reconnected.
Whenever a new master cylinder is installed, brakes lines to wheel positions must be bled to remove air, old fluid and contaminants. If your vehicle is equipped with anti-lock brakes, the mechanic may use a bidirectional scan tool during brake bleeding to actuate the ABS pump, thus ensuring that all air is removed from the complex valving in the ABS system.
All brake line connections that were removed during the master cylinder replacement are inspected for any leakage and the vehicle is road tested to ensure normal operation of the brakes.

Is it safe to drive with a master cylinder problem?

No, any fault in the master cylinder, which is part of the braking system creates a safety risk. A fully operational brake system is essential to quickly stopping your car. Driving a vehicle isn’t safe, if the master cylinder is leaking or has other faults, as braking distances might be longer than normal. The braking system on a vehicle is among the most important safety systems and must be fully functional to safely drive your vehicle.

When replacing the master cylinder keep in mind:

The master cylinder is only one component of many in a vehicle’s braking system. During replacement of the master cylinder, all vehicle braking system components should be inspected to ensure maximum braking power is available.
The amount of friction material remaining on the brake pads and brake shoes should be verified.
Brake lines and flexible rubber hoses at each wheel position should be inspected for corrosion and deterioration.
The power brake booster should be evaluated to ensure that power assist is working properly.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee

Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(193)

Rating Summary

174

5

3

6

5

174

5

3

6

5

SEE REVIEWS NEAR ME

Claude

20 years of experience

29 reviews

Claude

20 years of experience

by Mark

BMW 330i L6-3.0L - Car is not starting - Lawrenceville, Georgia

Very knowledgeable and friendly. Showed up on time and gave status updates when on the way.

John

33 years of experience

1126 reviews

John

33 years of experience

by Mitch

BMW 330i L4-2.0L Turbo - Oil Change - Houston, Texas

Super professional & efficient... BMW owners rest assured this tech will take good care of you!

Kevin

25 years of experience

651 reviews

Kevin

25 years of experience

by David

BMW 330i L6-3.0L - Oil/Fluid Leak - Duluth, Georgia

Hello Kevin, it's David Knight, the owner of the Burgundy 2001 BMW 330xi, you said I Need A Valve Cover, or do I need to purchase a valve cover kit?

Michael

17 years of experience

606 reviews

Request Michael

Michael

17 years of experience

Request Michael

by Anthony

BMW 330i L6-3.0L - Power Steering Belt - Atlanta, Georgia

Michael was timely, efficient, courteous and I can truly say that although I was skeptical to use yourmechanic.com, Michael sealed the deal. His conversation was natural and honest his personality was genuine and fun which is not something you usually look for in a mechanic but will ensure that I use your services for the foreseeable future. Highly recommend him!

Excellent Rating

(193)

Rating Summary

174

5

3

6

5

174

5

3

6

5

SEE REVIEWS NEAR ME

Recent articles & questions

Is It Safe to Drive After Giving Blood?

So, So, you are planning to give blood. Good for you! Many lives are saved, every single day in America, by good Samaritans who donate their blood. Accident victims, transplant recipients and others all benefit from donated blood. Having said...

How to Buy a Good Quality Carburetor

Vehicles Vehicles are now manufactured using a fuel injection system in order to provide the engine with the proper fuel-air mixture. Prior to the 1980s, however, carburetors performed this task. The carburetor is similar to a throttle body in that...

P0931 OBD-II Trouble Code: Gear Shift Lock Solenoid Circuit High

P0931 means that there is an issue with the gear shift lock solenoid circuit due to a faulty solenoid, wiring issues, or faulty break light switch.

Starting Issue

Although you've replaced the battery, it should still be tested. The battery is the heart of the starting and charging systems. However, with a known good battery, suspect the starter or fuel delivery next. A certified mechanic, such as one...

Dashboard show the SRS light on

Hello. If there has never been any accidents and that is what the computer is saying, then the computer would likely need to be replaced. The SRS module will fail over time and cause these readings to occur. If all...

Replaced front suspension got aligned new tires , steering shudders at low turning speed still chevy silverado 2004 1500

Hi Houston. Thanks for contacting us today. Sometimes when multiple components are replaced, and adjustments made, it will highlight other parts that were not replaced that might be loose or wearing out. Based on what you've indicated in your question,...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (844) 997-3624 · hi@yourmechanic.com