{"product_id":"dorman-m390177-brake-master-cylinder","title":"Dorman M390177 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Buick, Chevrolet, Oldsmobile, Pontiac\u003c\/h2\u003e\u003cp\u003eThe Dorman M390177 Brake Master Cylinder is engineered to restore proper brake hydraulics in select GM vehicles. Designed for models like the Buick Regal, Chevrolet Lumina, Oldsmobile Cutlass Supreme, Pontiac Grand Prix, and Monte Carlo, this master cylinder ensures consistent brake fluid pressure and pedal feel.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 24 mm for precise hydraulic control\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum material for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for brake fluid storage and monitoring\u003c\/li\u003e\n\u003cli\u003eEquipped with a sensor to support brake system diagnostics\u003c\/li\u003e\n\u003cli\u003eFour outlet ports with secondary outlet thread diameter of 10 mm\u003c\/li\u003e\n\u003cli\u003eRearward outlet size: M10 x 1.0 thread and unthreaded for versatile installation\u003c\/li\u003e\n\u003cli\u003ePackage contains the master cylinder unit; mounting hardware not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M390177 master cylinder is crafted from aluminum, providing a lightweight yet robust component that resists corrosion and wear. Its 24 mm bore diameter is calibrated to deliver consistent hydraulic pressure, essential for safe braking performance. The included reservoir allows for proper brake fluid containment and monitoring, while the integrated sensor supports vehicle brake system diagnostics, helping maintain system integrity. With four outlets and a secondary outlet thread diameter of 10 mm, this master cylinder accommodates complex brake line configurations found in Buick Regal, Chevrolet Lumina, Oldsmobile Cutlass Supreme, Pontiac Grand Prix, and Monte Carlo models. The rearward outlet features an M10 x 1.0 thread and an unthreaded option, offering flexibility during installation.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder is compatible with the following makes and models:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuick Regal\u003c\/li\u003e\n\u003cli\u003eChevrolet Lumina\u003c\/li\u003e\n\u003cli\u003eOldsmobile Cutlass Supreme\u003c\/li\u003e\n\u003cli\u003ePontiac Grand Prix\u003c\/li\u003e\n\u003cli\u003ePontiac Monte Carlo\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIt is designed to replace worn or failing master cylinders in these vehicles, restoring proper brake hydraulic function and pedal response.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by This Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpongy or unresponsive brake pedal\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks from the master cylinder or reservoir\u003c\/li\u003e\n\u003cli\u003eBrake warning light activation due to sensor faults\u003c\/li\u003e\n\u003cli\u003eReduced braking efficiency or inconsistent brake pressure\u003c\/li\u003e\n\u003cli\u003eContaminated or deteriorated brake fluid reservoir\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M390177 master cylinder requires careful attention to brake system bleeding procedures to remove air and ensure proper hydraulic pressure. Mounting hardware is not included, so existing hardware should be inspected and replaced if necessary. Verify compatibility with your specific vehicle model and year before installation. Sensor connections must be securely attached to maintain brake system diagnostics functionality.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures this brake master cylinder to meet or exceed OEM specifications, using quality aluminum materials and precise engineering. The product includes a sensor to support vehicle diagnostics and is designed for durability and reliable performance. Warranty coverage details should be confirmed at the point of purchase, as they may vary by distributor.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792116154549,"sku":"BKKX-M390177","price":130.63,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390177_Fro.jpg?v=1774997553","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390177-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}