Brake pumps

Brake master cylinders are key components of the braking system, generating the hydraulic pressure necessary for proper brake operation. They transfer the force applied to the brake pedal to the pads and discs, ensuring effective braking and vehicle control. At Global Parts, you'll find a wide selection of used car parts , including brake master cylinders, ideal for BMW , Audi , Mercedes , Volkswagen , Mini , and more .

Definition and operation of brake master cylinders

A master cylinder is a hydraulic piston device that converts pedal force into brake fluid pressure. Most modern passenger cars use dual-circuit master cylinders, meaning the braking system is divided into two independent circuits – increasing safety in the event of a failure in one circuit. A typical master cylinder generates pressure between 60 and 120 bar, sufficient to effectively stop a vehicle weighing over 1.5 tons.

What are the functions of brake master cylinders ?

Brake master cylinders play a key role in the braking system, enabling: Generating Hydraulic Pressure – Pumping brake fluid through the system, which enables the brake calipers and cylinders to operate effectively. Braking force distribution – In the case of pumps equipped with dual circuits, they enable the pressure to be evenly distributed between the front and rear axles of the vehicle. Support for safety systems – Modern pumps work with ABS, ESP and EBD systems, improving vehicle stability during braking.

Examples of models

Depending on the car model, brake master cylinders vary in piston diameter (usually 19 to 26 mm), stroke length, and mounting method. For example:

• The Audi A3 8P brake master cylinder is compatible with 1.6–2.0 TDI engines and works with the Bosch ABS system.
• Brake master cylinder w211 (Mercedes E-Class) is available in traditional and SBC (Sensotronic Brake Control) versions, which use an electro-hydraulic power steering system.
• BMW E60 and E90 brake master cylinder have different piston diameters depending on the engine version, which affects the braking force and pedal hardness.

Why is it worth taking care of brake pumps ?

A worn or damaged master cylinder can lead to serious braking system problems such as: Soft brake pedal – May indicate a leak in the pump or air in the system. Ineffective braking – Problems with pressure generation can significantly reduce brake effectiveness. Brake Fluid Leaks – Leaks in the master cylinder can lead to fluid loss, which compromises driving safety. ABS/ESP system errors – Problems with the brake master cylinder can affect the operation of brake assist systems. At Global Parts, we offer original used brake master cylinders that have undergone extensive quality testing, ensuring their durability and reliability.

Table of symptoms and parameters

Symptom	Possible cause	Recommended action
Soft brake pedal	Loss of pump pressure	Leak check and replacement
Longer braking distance	Internal wear of pump pistons	Working pressure diagnostics
Fluid leaks	Damage to seals	Pump regeneration or replacement
No ABS response	Sensor error or incompatible pump	Replacement with an ABS/ESP compatible version

How to choose the right brake master cylinders ?

When choosing a brake master cylinder, there are several key aspects to consider: Vehicle-specific fit – Every braking system has its own specific technical requirements. At Global Parts, you'll find master cylinders perfectly suited to BMW , Audi , Mercedes , Volkswagen , Mini , and more . Technical condition – Used brake master cylinders should be free from leaks, mechanical damage and corrosion. Pump Type – Make sure the pump you choose is compatible with your vehicle’s brake assist systems, such as ABS or ESP.

Fit and Compatibility

The most important selection criterion is the part number (OEM), which allows for precise matching of the pump to the specific braking system. In models such as the Audi A4 B7, Mercedes W211 SBC, or BMW E90, differences in pump design may result from engine type, body style, or year of manufacture. Therefore, at Global Parts, each brake pump comes with a full compatibility description, facilitating quick matching of the part to a specific vehicle.

Why choose used brake master cylinders ?

Used car parts , such as brake master cylinders, are a practical solution that allows you to save money while maintaining high quality. By choosing used brake master cylinders, you gain: Lower costs – Used pumps are much cheaper than new ones, but offer just as high quality. Ecology – Recycling car parts supports environmental protection and reduces waste. A wide range – In our store you will find brake master cylinders for the most popular car brands.

Technical benefits

Thanks to testing and quality control, used brake master cylinders available from Global Parts maintain their tightness and nominal operating pressure. The average lifespan of this component under typical operating conditions is over 150,000 km . Additionally, many master cylinders, such as those in the BMW E60 or Audi A3 8P, can be rebuilt by replacing the seal kit, further extending their lifespan and reducing operating costs.

How to take care of brake pumps ?

To ensure that brake master cylinders function reliably for a long time, it is worth following a few rules: Check the brake fluid level and quality regularly to prevent corrosion of the internal components of the pump. Remove air from the braking system during maintenance to ensure full pump efficiency. Monitor any signs of malfunction, such as a soft brake pedal or leaks, and respond in a timely manner. If you need a replacement, you'll find the right used car parts at Global Parts that will restore full functionality of your braking system.

FAQ - Frequently asked questions about brake master cylinders

Question	Answer
What is the function of brake pumps in a car?	This is a component of the hydraulic system that converts the force of the brake pedal into brake fluid pressure transmitted to the calipers.
How does a brake master cylinder work?	Inside the pump housing there is a piston which, under the influence of pedal pressure, generates pressure and distributes the fluid to both brake circuits.
What does SBC brake master cylinder mean in a Mercedes W211?	SBC (Sensotronic Brake Control) is an electro-hydraulic system that controls braking pressure electronically – improving efficiency and shortening braking distances.
How do I check the pump's compatibility with my car?	The most reliable way is to compare the OEM number or VIN number, which allows you to select a part with identical technical parameters.
Is the BMW E90 brake master cylinder different from the E60?	Yes, they differ in piston diameter and brake booster mounting, so they are not interchangeable between models.
What are the symptoms of a worn brake master cylinder?	These include decreased braking efficiency, a soft pedal, fluid leaks or an illuminated ABS warning light.
Which brands offer pumps compatible with the Audi A4 B7 or A3 8P?	The most commonly used pumps are Bosch, ATE and TRW – all available from Global Parts as original used parts.

Summary: Brake Master Cylinders at Global Parts Automotive Store

Brake master cylinders are key components of the braking system, ensuring effective and safe braking in all conditions. By maintaining their technical condition, you can improve brake performance and increase driving safety. The Global Parts automotive store invites you to browse our wide selection of original used car parts . Whether you're looking for car parts for BMW , Audi , Volkswagen , Mercedes, Mini , and more, you'll find them at competitive prices. We strive to ensure every customer finds the right parts for their car, and if you have any questions or concerns about selecting the right components, we're happy to help! Please contact us – we're here to help! For more information and interesting facts, visit our automotive blog .