{"id":117293,"date":"2024-04-08T09:20:30","date_gmt":"2024-04-08T09:20:30","guid":{"rendered":"https:\/\/www.dubizzle.com\/blog\/cars\/?p=117293"},"modified":"2024-04-08T09:20:32","modified_gmt":"2024-04-08T09:20:32","slug":"brake-master-cylinder","status":"publish","type":"post","link":"https:\/\/www.dubizzle.com\/blog\/cars\/brake-master-cylinder\/","title":{"rendered":"Auto Anatomy: Brake Master Cylinder"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li><a href=\"#h-working-and-function-of-a-brake-master-cylinder\">Working<\/a>&nbsp;<\/li><li><a href=\"#h-components-of-master-cylinder\">Components<\/a><\/li><li><a href=\"#h-types-of-master-cylinder\">Types<\/a><\/li><li><a href=\"#h-symptoms-of-a-failing-brake-master-cylinder\">Failure Symptoms<\/a><\/li><li><a href=\"#h-faqs\">FAQs<\/a><\/li><\/ul>\n\n\n\n<p>A car\u2019s braking system consists of several components. One of them is a brake master cylinder, also known as the master cylinder. It converts the pressure from the brake pedal into hydraulic force, which then applies to the brakes. Doing so allows the vehicle to slow down or stop.<\/p>\n\n\n\n<p>Let\u2019s go through the role of a master cylinder in a car, how it works, its types and components.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-working-and-function-of-a-brake-master-cylinder\"><strong>WORKING AND FUNCTION OF A BRAKE MASTER CYLINDER<\/strong>&nbsp;&nbsp;<\/h2>\n\n\n\n<p>The brake master cylinder is an essential component in different <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/car-braking-system-types\/\" target=\"_blank\" rel=\"noreferrer noopener\">types of car braking systems<\/a>. It converts the force exerted by the driver&#8217;s foot on the brake pedal into hydraulic pressure. When the brake pedal is depressed, it activates a piston within the master cylinder, pressuring the brake fluid.&nbsp;<\/p>\n\n\n\n<p>This pressurised fluid transmits through the brake lines to the brake callipers or wheel cylinders at each wheel. It forces the brake pads or shoes against the <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/brake-rotors\/\" target=\"_blank\" rel=\"noreferrer noopener\">brake rotors<\/a>, resulting in friction that slows down or stops the vehicle.&nbsp;<\/p>\n\n\n\n<p>In addition, the brake cylinder master uses a piston with different-sized surfaces to multiply hydraulic force. With minimal pedal pressure, it generates high pressure in the brake lines, ensuring effective braking.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-1024x640.png\" alt=\"working of cylinder brake master\" class=\"wp-image-117298\" srcset=\"https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-1024x640.png 1024w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-300x188.png 300w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-768x480.png 768w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-640x400.png 640w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-421x263.png 421w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-558x349.png 558w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-363x227.png 363w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-250x156.png 250w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-368x230.png 368w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-774x484.png 774w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-672x420.png 672w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-437x273.png 437w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-301x188.png 301w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-240x150.png 240w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-771x482.png 771w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-669x418.png 669w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051441\/master-brake-435x272.png 435w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>A brake cylinder helps in slowing down the car or stopping it. Image Credits &#8211; Shutterstock Image Contributor &#8211;   TIBY K GEORGE<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-components-of-master-cylinder\"><strong>COMPONENTS OF MASTER CYLINDER<\/strong><\/h2>\n\n\n\n<p>The brake master cylinder consists of several key components. They include:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-reservoir\">Reservoir<\/h3>\n\n\n\n<p>The reservoir stores the brake fluid, which is among the <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/essential-fluids-car\/\" target=\"_blank\" rel=\"noreferrer noopener\">essential car fluids<\/a> for the operation of the braking system. It consists of a plastic or metal container with a cap for easy access for topping up brake fluid.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-piston\">Piston<\/h3>\n\n\n\n<p>The piston is housed within the cylinder bore of the cylinder. When the brake pedal is pressed, the piston moves forward, pressurising the brake fluid in the cylinder bore.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-cylinder-bore\">Cylinder Bore<\/h3>\n\n\n\n<p>This is the cylindrical chamber where the piston moves back and forth. It is sealed to prevent <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/brake-fluid-leak\/\" target=\"_blank\" rel=\"noreferrer noopener\">brake fluid leaks<\/a> and maintain hydraulic pressure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-primary-and-secondary-chambers\">Primary and Secondary Chambers<\/h3>\n\n\n\n<p>Some master cylinders feature dual chambers to separate the front and rear brake circuits for safety reasons. The primary chamber is responsible for one set of brakes (usually the front), while the secondary chamber controls the other set (mostly the rear).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-1024x640.png\" alt=\"components of brake cylinder\" class=\"wp-image-117299\" srcset=\"https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-1024x640.png 1024w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-300x188.png 300w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-768x480.png 768w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-640x400.png 640w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-421x263.png 421w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-558x349.png 558w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-363x227.png 363w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-250x156.png 250w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-368x230.png 368w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-774x484.png 774w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-672x420.png 672w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-437x273.png 437w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-301x188.png 301w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-240x150.png 240w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-771x482.png 771w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-669x418.png 669w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051453\/master-brake-2-435x272.png 435w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Many components work together in a car&#8217;s braking system. Image Credits: Photoshop Image Contributor &#8211; chinnadit.s<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-seals\">Seals<\/h3>\n\n\n\n<p>Seals prevent leaks and maintain hydraulic pressure within the master cylinder. They are usually made of rubber to withstand the pressures generated during braking.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-fluid-ports\">Fluid Ports<\/h3>\n\n\n\n<p>These ports allow <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/car-brake-fluid\/\" target=\"_blank\" rel=\"noreferrer noopener\">car brake fluid<\/a> to enter and exit the cylinder master. There are usually two ports per chamber\u2014one for fluid inlet and one for fluid outlet.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-fluid-level-sensor\">Fluid Level Sensor&nbsp;<\/h3>\n\n\n\n<p>In some modern cars, a fluid level sensor in the master cylinder reservoir alerts the driver when the brake fluid level is low.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-types-of-master-cylinder\"><strong>TYPES OF MASTER CYLINDER<\/strong><\/h2>\n\n\n\n<p>Here are the two main types of brake master cylinders.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-single-master-cylinder\">Single Master Cylinder<\/h3>\n\n\n\n<p>This type has a single piston and cylinder bore. It is used in older and some smaller vehicles such as <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/kei-cars\/\" target=\"_blank\" rel=\"noreferrer noopener\">kei cars<\/a>. Moreover, in a single master-cylinder setup, all brake circuits (front and rear brakes) are controlled by a single-cylinder bore.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-dual-master-cylinder\">Dual Master Cylinder<\/h3>\n\n\n\n<p>A dual master cylinder features two piston and cylinder bore assemblies, each responsible for controlling a different brake circuit. One cylinder bore controls the front <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/car-brakes\/\" target=\"_blank\" rel=\"noreferrer noopener\">car brakes<\/a>, while the other controls the rear brakes.&nbsp;<\/p>\n\n\n\n<p>Besides, this setup provides redundancy and safety because if one brake circuit fails, the other can still provide partial braking. It allows the driver to maintain some control over the vehicle. Moreover, dual master cylinders are standard in most modern cars and considered safer than single master counterparts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-symptoms-of-a-failing-brake-master-cylinder\"><strong>SYMPTOMS OF A FAILING BRAKE MASTER CYLINDER&nbsp;<\/strong><\/h2>\n\n\n\n<p>A failing or damaged brake master cylinder can lead to various <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/car-brake-problems\/\" target=\"_blank\" rel=\"noreferrer noopener\">car braking problems<\/a>. Here are the common symptoms:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-soft-or-spongy-brake-pedal\">Soft or Spongy Brake Pedal<\/h3>\n\n\n\n<p>One of the most noticeable signs of a failing master cylinder is a soft or <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/spongy-brake-pedals\/\" target=\"_blank\" rel=\"noreferrer noopener\">spongy brake pedal<\/a>. If the pedal feels mushy or requires more effort to depress than usual, it could indicate an internal leakage within the master cylinder.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-1024x640.jpg\" alt=\"symptoms of a damaged brake cylinder master like spongy pedal \" class=\"wp-image-117300\" srcset=\"https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-1024x640.jpg 1024w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-300x188.jpg 300w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-768x480.jpg 768w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-640x400.jpg 640w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-421x263.jpg 421w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-558x349.jpg 558w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-363x227.jpg 363w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-250x156.jpg 250w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-368x230.jpg 368w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-774x484.jpg 774w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-672x420.jpg 672w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-437x273.jpg 437w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-301x188.jpg 301w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-240x150.jpg 240w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-771x482.jpg 771w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-669x418.jpg 669w, https:\/\/d2hucwwplm5rxi.cloudfront.net\/wp-content\/uploads\/2024\/04\/08051642\/Auto-Anatomy-Brake-Master-Cylinder_-Body-5-435x272.jpg 435w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>A spongy brake pedal indicates a damaged master cylinder. Image Credits &#8211; Shutterstock Image Contributor &#8211; Nor Gal<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-brake-fluid-leaks\">Brake Fluid Leaks<\/h3>\n\n\n\n<p>Visible brake fluid leaks around or beneath the vehicle or near the brake lines indicate a failing master cylinder. Leaks can occur due to worn seals or cylinder bore damage, leading to hydraulic pressure loss and reduced braking effectiveness.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-brake-warning-light\">Brake Warning Light<\/h3>\n\n\n\n<p>A lit <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/brake-system-warning-lights\/\" target=\"_blank\" rel=\"noreferrer noopener\">brake warning system light<\/a> signals various brake system issues including a failing master cylinder. If the brake fluid level drops below a certain threshold due to a leak or leakage within the cylinder brake master, the warning light may illuminate.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-brake-fluid-contamination\">Brake Fluid Contamination<\/h3>\n\n\n\n<p>Contaminated brake fluid, which appears dark or murky instead of clear, can indicate internal corrosion or seal degradation within the brake cylinder. Besides, it affects the brake performance and should be addressed promptly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-inconsistent-braking-performance\">Inconsistent Braking Performance<\/h3>\n\n\n\n<p>A failing master cylinder may cause inconsistent braking performance, such as brakes that grab or pull to one side during braking. It results from the unequal distribution of hydraulic pressure to the <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/brake-calliper-guide\/\" target=\"_blank\" rel=\"noreferrer noopener\">brake callipers<\/a> or wheel cylinders, leading to uneven braking force.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faqs\"><strong>FAQs<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-does-the-brake-master-cylinder-do\">What does the brake master cylinder do?<\/h3>\n\n\n\n<p>The brake master cylinder converts the force from the brake pedal into hydraulic pressure. It then activates the brakes to slow down or stop the car.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-causes-master-cylinder-failure\">What causes master cylinder failure?<\/h3>\n\n\n\n<p>Master cylinder failure can be caused by internal seal wear or corrosion, leading to brake fluid leaks and loss of hydraulic pressure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-can-i-drive-my-car-with-a-bad-brake-master-cylinder\">Can I drive my car with a bad brake master cylinder?<\/h3>\n\n\n\n<p>Driving with a bad brake master cylinder poses significant safety hazards. It should be avoided until the issue is resolved by a professional mechanic.<\/p>\n\n\n\n<p>That is all on the brake master cylinder and its role in a car\u2019s braking system. However, in case of any malfunctions, it poses serious hazards to car safety and must be looked into immediately.&nbsp;<\/p>\n\n\n\n<p>If your car is also breaking down frequently due to damaged components, it\u2019s time to switch to a better ride. For that, sift through these <a href=\"https:\/\/uae.dubizzle.com\/motors\/used-cars\/\" target=\"_blank\" rel=\"noreferrer noopener\">used cars for sale in the UAE<\/a> that offer several listings under different budgets.<\/p>\n\n\n\n<p>To learn more about different types of car components and their working, keep reading <a href=\"https:\/\/www.dubizzle.com\/blog\/cars\/\" target=\"_blank\" rel=\"noreferrer noopener\">dubizzle\u2019s auto blog<\/a>.&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A brake master cylinder converts the pedal pressure into hydraulic force. Here\u2019s why it&#8217;s crucial in a braking system.  <\/p>\n","protected":false},"author":40,"featured_media":117294,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"dubizzle-taxonomy-car-year":[],"dubizzle-taxonomy-body-type":[],"dubizzle-taxonomy-car-doors":[],"dubizzle-taxonomy-car-cylinders":[],"dubizzle-taxonomy-car-extras":[],"dubizzle-taxonomy-car-color":[],"dubizzle-taxonomy-car-fuel-type":[],"class_list":{"0":"post-117293","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-parts-repairs"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>All About Brake Master Cylinder: Working, Types &amp; More | dubizzle<\/title>\n<meta name=\"description\" content=\"A brake master cylinder is part of the braking system that helps slow down or stop the vehicle. 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