logo

BMW M235i 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

(4)

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

(4)

Brake Master Cylinder Replacement Service

How much does a Brake Master Cylinder Replacement cost?

On average, the cost for a BMW M235i Brake Master Cylinder Replacement is $615 with $447 for parts and $168 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2016 BMW M235iL6-3.0L TurboService typeBrake Master Cylinder ReplacementEstimate$1116.48Shop/Dealer Price$1359.90 - $2065.86
2014 BMW M235iL6-3.0L TurboService typeBrake Master Cylinder ReplacementEstimate$1069.75Shop/Dealer Price$1298.89 - $1973.93
2015 BMW M235iL6-3.0L TurboService typeBrake Master Cylinder ReplacementEstimate$1069.75Shop/Dealer Price$1298.97 - $1974.07
Show example BMW M235i 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

Number of BMW M235i services completed
44+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1200+
experts on our platform
Yourmechanic was featured in

New York Times NBC CBS Forbes INC Tech Crunch

Learn more about us

Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(4)
Rating Summary
3
1
0
0
0
3
1
0
0
0

William

35 years of experience
731 reviews
Request William
William
35 years of experience
Request William
by Curt
BMW M235i L6-3.0L Turbo - Oil Change - Surprise, Arizona
Great service! Very thorough!

Jean

16 years of experience
157 reviews
Request Jean
Jean
16 years of experience
Request Jean
by Paul
BMW M235i L6-3.0L Turbo - Car Battery Replacement - Clearwater, Florida
Work was good but quote was increased and wrong part sent so service was not complete

Jose

10 years of experience
63 reviews
Request Jose
Jose
10 years of experience
Request Jose
by Tejas
BMW M235i L6-3.0L Turbo - Brake Pads Replacement (Front) - San Mateo, California
Jose was extremely professional and did a great job changing the brakes on my car. He was on schedule and communicated very well. I would completely recommended him to anyone.

Ronald

42 years of experience
519 reviews
Request Ronald
Ronald
42 years of experience
Request Ronald
by Alphonso
BMW M235i L6-3.0L Turbo - reservoir return hose - Spring, Texas
Very professional and courteous. Was able to source the part and get it done quickly and cost effectively. Will use again.

Excellent Rating

(4)
Rating Summary
3
1
0
0
0
3
1
0
0
0
Number of BMW M235i services completed
44+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1200+
experts on our platform
Yourmechanic was featured in

New York Times NBC CBS Forbes INC Tech Crunch

Learn more about us

Recent articles & questions

P003A OBD-II Trouble Code: Turbocharger/Supercharger Boost Control "A" Position Exceeded Learning Limit
The P003A trouble code means the Electronic Computer Module (ECM) has detected an issue in the turbocharger or supercharger system.
Read more
Symptoms of a Bad or Failing Anti Lock Pressure Switch
If your ABS system is not working or continuously running, or if your brakes are locking up, you may have to replace the anti-lock pressure switch.
Read more
Veteran and Military Driver Laws and Benefits in Vermont
If If you are on active duty, or if you are a veteran living in, working in, or originally from Vermont, you should get a better understanding of the laws and benefits and how they apply to you. The following...
Read more

Car misses and has a rough idle - 2001 Saturn L100

Hello. There are several things that could be causing your rough idle condition and therefore there are multiple possible solutions. Carbon buildup inside the intake manifold and valve train is a big cause of rough idle. This can usually be...
Read more

Check engine light and grinding sound when start.

Hi there. Since the sound is only occurring when the vehicle is started up, then most likely the timing chain tensioner(s) are worn or the actuator is sticking and causing the timing chain to be loose until enough engine oil...
Read more

Red Lightning Bolt in dash

Hi There, The red lightning bolt (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) indicates that there is a problem wit the electronic throttle control unit. This may be for a specific reason or may be due to a slight glitch. Try resetting the throttle control unit...
Read more
  1. Home
  2. Estimates
  3. BMW
  4. M235i
  5. Brake Master Cylinder Replacement

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

Read FAQ
GET A QUOTE