BMW 325iX Brake Master Cylinder Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(7,430)

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.

Customer Ratings

(7,430)

Brake Master Cylinder Replacement Service

How much does a Brake Master Cylinder Replacement cost?

On average, the cost for a BMW 325iX Brake Master Cylinder Replacement is $696 with $556 for parts and $140 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1991 BMW 325iXL6-2.5LService typeBrake Master Cylinder ReplacementEstimate$2924.10Shop/Dealer Price$3622.68 - $5704.23
1990 BMW 325iXL6-2.5LService typeBrake Master Cylinder ReplacementEstimate$2915.09Shop/Dealer Price$3610.57 - $5689.81
Show example BMW 325iX 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

(7,430)

Rating Summary
6,938
220
61
51
160
6,938
220
61
51
160

James

17 years of experience
23 reviews
James
17 years of experience
BMW M5 V8-5.0L - Brake Master Cylinder - Morrisville, Pennsylvania
James went above and beyond when my brake master cylinder replacement (that I attempted to do myself) went awry. He spent plenty of time making sure the brakes were bled correctly. I highly recommend James.

Chris

23 years of experience
2372 reviews
Chris
23 years of experience
BMW 735i L6-3.5L - Brake Master Cylinder - San Juan Capistrano, California
Chris was punctual and professional. Very efficient and knowledgeable. Work was done in the manner that I expected. Good mechanic...

Victor

12 years of experience
211 reviews
Victor
12 years of experience
BMW 528i L6-2.8L - Brake Master Cylinder Replacement - Virginia Beach, Virginia
Victor was timely with his arrival. He was courteous and interested in solving my car problem. We had meaningful conversation about the car and the repair. It was a pleasant experience and I would request Victor as my mechanic again.

Joel

12 years of experience
177 reviews
Joel
12 years of experience
BMW 328i L6-3.0L - Oil Change - Carrollton, Texas
Joel did an outstanding job and kept me up to date on his progress.

Excellent Rating

(7,430)

Rating Summary
6,938
220
61
51
160
6,938
220
61
51
160
Number of BMW services completed
81730+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1200+
experts on our platform

Recent articles & questions

P0927 OBD-II Trouble Code: Gear Shift Reverse Actuator Circuit High
P0927 code means the ECM detected a higher than normal voltage within the gear shift reverse actuator often due too mechanical issues.
How Long Does an Engine Control Module (ECM) Last?
As technology continues to advance and move forward, so does the way our vehicles operate and run. It seems more and...
How to Get a New Mexico Driver's Permit
Like Like many other states, New Mexico uses a graduated licensing program that requires all new drivers under 18 years old to begin driving under supervision, in order to practice safe driving before getting their full driver’s license. In order...

What seat belt parts have to be replaced after a crash?

Countless hours are spent designing and implementing safety features in modern vehicles, so the vehicle contains a considerable number of safety measures to ensure occupant safety. Seat belts are one of the few safety features that doesn’t require replacement after...

Already checked timing Belt, but now it don't recognize the computer immobilizer.

Hi there. Try reprogramming the key fob to your vehicle. Click here to view the procedure on reprogramming your key fob (http://www.carandtruckremotes.com/how-to-program-honda-replacement-car-remotes.html). If the key is programmed to your vehicle, then the immobilizer controller may need to be replaced. I...

Have code P0174, did smoke test smoke comes out EGR valve. Does that mean it's bad? 2004 Ford Ranger

Hi there - smoke coming out of the EGR valve simply means the valve is either leaking, or stuck in the "open" position. The P0174 (https://www.yourmechanic.com/article/p0174-obd-ii-trouble-code-system-too-lean-bank-2-by-blake-griffin) code indicates a "lean" condition too much air/not enough fuel on the bank of...

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 (855) 347-2779 · hi@yourmechanic.com