Audi A4 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

(388)

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

(388)

Brake Master Cylinder Replacement Service

How much does a Brake Master Cylinder Replacement cost?

On average, the cost for a Audi A4 Brake Master Cylinder Replacement is $223 with $109 for parts and $114 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2012 Audi A4L4-2.0L TurboService typeBrake Master Cylinder ReplacementEstimate$543.46Shop/Dealer Price$659.09 - $935.08
2005 Audi A4V6-3.0LService typeBrake Master Cylinder ReplacementEstimate$487.66Shop/Dealer Price$594.66 - $820.98
2008 Audi A4V6-3.2LService typeBrake Master Cylinder ReplacementEstimate$487.66Shop/Dealer Price$594.65 - $820.97
1999 Audi A4V6-2.8LService typeBrake Master Cylinder ReplacementEstimate$332.07Shop/Dealer Price$407.58 - $586.88
2006 Audi A4L4-1.8L TurboService typeBrake Master Cylinder ReplacementEstimate$487.66Shop/Dealer Price$594.72 - $821.08
1999 Audi A4L4-1.8L TurboService typeBrake Master Cylinder ReplacementEstimate$332.07Shop/Dealer Price$407.62 - $586.96
2017 Audi A4L4-2.0L TurboService typeBrake Master Cylinder ReplacementEstimate$865.08Shop/Dealer Price$1054.14 - $1581.31
2015 Audi A4L4-2.0L TurboService typeBrake Master Cylinder ReplacementEstimate$1101.08Shop/Dealer Price$1363.66 - $2078.71
Show example Audi A4 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 Audi mechanics

Real customer reviews from Audi owners like you.

Excellent Rating

(388)

Rating Summary
356
15
2
2
13
356
15
2
2
13

Theodore

16 years of experience
1587 reviews
Theodore
16 years of experience
Audi A4 L4-2.0L Turbo - Oil Change - Medina, Washington
It's nice experience with theodore. He's professional with good experience

Alex

16 years of experience
435 reviews
Alex
16 years of experience
Audi A4 L4-2.0L Turbo - Positive Crankcase Ventilation (PCV) Valve - Plano, Texas
Alex is very professional, he completed the service very good, this is my third appointment with Alex, I am 100% satisfied with all his work, I strongly recommend him. Thank you YourMechanic and Alex.

Joe

43 years of experience
821 reviews
Joe
43 years of experience
Audi A4 L4-2.0L Turbo - Check Engine Light is on - Tampa, Florida

Ronnaldo

11 years of experience
49 reviews
Ronnaldo
11 years of experience
Audi A4 L4-1.8L Turbo - Alternator Repair - Ellenwood, Georgia
Got work done quick, clean, and even went extra mile, awesome work and person.

Excellent Rating

(388)

Rating Summary
356
15
2
2
13
356
15
2
2
13
Number of Audi A4 services completed
4268+
services done by our mechanics
TOTAL NUMBER OF EXPERT Audi MECHANICS
700+
experts on our platform

Recent articles & questions

Top 10 Scenic Drives in North Carolina
North Carolina is home to a diverse landscape that ranges from the Appalachian Mountains to the Atlantic Coast. This quality makes the state a prime stomping ground for travelers who enjoy the more picturesque side of their surroundings and aren’t...
The Best Used Cars to Buy If You're a Skier
When When summer ends, skiers start thinking about hitting the hills, and that means having to contend with winter driving conditions. Not just any vehicle is going to get the job done. We have evaluated several used ski-worthy vehicles, and...
Symptoms of a Bad or Failing AC Compressor Belt
If the belt has cracking on the ribs, chunks missing, or abrasions on the back or sides, your AC compressor belt may need replacing.

How do you use the Auxiliary jack on the audio system for the Ford Fusion?

Your car is equipped from the factory to let you connect other devices to your radio. The Auxiliary jack lets you connect things like an external CD player, or even an MP3 player to the radio – any device that...

Key button locks the car but doesn’t arm the car

There are a few potential answers to this question. If the original key still arms the vehicle and unlocks the car, then the fault most likely lies with the second key. If both keys do not function, then the most...

Misfiring

This is often times related to what is called an idle air control valve which controls the air/fuel mixture at idle speed. When this is not working properly, this can cause the car to run either too rich (too much...

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