Hummer H3 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

(192)

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

(192)

Brake Master Cylinder Replacement Service

How much does a Brake Master Cylinder Replacement cost?

On average, the cost for a Hummer H3 Brake Master Cylinder Replacement is $543 with $193 for parts and $350 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2010 Hummer H3L5-3.7LService typeBrake Master Cylinder ReplacementEstimate$773.22Shop/Dealer Price$878.65 - $1174.69
2009 Hummer H3L5-3.7LService typeBrake Master Cylinder ReplacementEstimate$1747.60Shop/Dealer Price$2097.83 - $3138.24
2010 Hummer H3V8-5.3LService typeBrake Master Cylinder ReplacementEstimate$750.70Shop/Dealer Price$851.77 - $1144.55
2008 Hummer H3L5-3.7LService typeBrake Master Cylinder ReplacementEstimate$1747.60Shop/Dealer Price$2097.89 - $3138.34
2008 Hummer H3V8-5.3LService typeBrake Master Cylinder ReplacementEstimate$1747.60Shop/Dealer Price$2101.58 - $3144.79
2007 Hummer H3L5-3.7LService typeBrake Master Cylinder ReplacementEstimate$1747.60Shop/Dealer Price$2098.25 - $3138.96
2009 Hummer H3V8-5.3LService typeBrake Master Cylinder ReplacementEstimate$1747.60Shop/Dealer Price$2097.93 - $3138.41
2006 Hummer H3L5-3.5LService typeBrake Master Cylinder ReplacementEstimate$1747.60Shop/Dealer Price$2097.89 - $3138.34
Show example Hummer H3 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 Hummer mechanics

Real customer reviews from Hummer owners like you.

Excellent Rating

(192)

Rating Summary
180
5
2
0
5
180
5
2
0
5

James

31 years of experience
1039 reviews
James
31 years of experience
Hummer H3 L5-3.7L - Wheel Bearings Replacement (Passenger Side Front) - Kissimmee, Florida
Very polite and knowledgeable

John

33 years of experience
1126 reviews
John
33 years of experience
Hummer H3 L5-3.5L - Battery - League City, Texas
Another great appointment. John showed up on time and did a professional job.

Jordan

9 years of experience
144 reviews
Jordan
9 years of experience
Hummer H3 L5-3.7L - Car is making a noise - Kissimmee, Florida
Very pleased.

Jamie

27 years of experience
30 reviews
Jamie
27 years of experience
Hummer H3 V8-5.3L - Oil Change - Mount Pleasant, South Carolina
Super nice guy! Came right on time, did the work I requested and explained somethings he noticed in inspection. I'll use him again

Excellent Rating

(192)

Rating Summary
180
5
2
0
5
180
5
2
0
5
Number of Hummer H3 services completed
2112+
services done by our mechanics
TOTAL NUMBER OF EXPERT Hummer MECHANICS
200+
experts on our platform

Recent articles & questions

P0506 OBD-II Trouble Code: Idle Control System RPM lower Than Expected
P0506 code definition When the P0506 diagnostic trouble code is stored by the Powertrain Control Module (PCM), it is an indication that...
How to Replace a Windshield Wiper Gearbox Assembly
Windshield wipers keep car windshields clear of rain and debris. The wiper gearbox transfers power from the wiper motor to the wiper arms.
A Buyer’s Guide to the 2013 Acura ILX Hybrid
Acura Acura returns from a spate of years devoted to the higher-end luxury market, and they do so in style with a car that practically invents its own segment. The ILX Hybrid is the half electric portion of the brand...

What does the low windshield washer fluid level Warning Light mean?

The “Windshield Washer Fluid Level” Warning Light indicates that the level of windshield washer fluid is low (https://www.yourmechanic.com/article/how-often-do-i-need-to-refill-the-windshield-washer-fluid) and should be added to the windshield washer fluid tank as soon as possible. Windshield washer fluid is a mixture that contains...

car wont stay running

If you say there is an "alarming" sound when it starts, then I would only suggest you have a proper diagnosis done. By doing so you'll be able to find the cause before you try and run it any more....

Car not starting, replaced battery and alternator fuse but now inside fuses are blowing and still not starting

Hi there. It is quite possible that you have an exposed electrical wire or a short somewhere in the electrical system that is the root source of your starting issue. A fuse or relay will continue to break when the...

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