If your Polaris ATV’s rear brakes are feeling spongy or failing, this HIFROM Rear Brake Master Cylinder might be just the fix you need. It’s a high-quality aftermarket part designed to replace original numbers like 1910301, 1911113, and 1910790. Made from durable metal for long service life, it’s built to handle the demands of off-road riding. Compatible with a bunch of Polaris models – think Sportsman (335, 400, 450, 500, 600, 700, 800), Magnum (325, 330, 500), Scrambler (400, 500), Trail Boss (325, 330), and Trail Blazer (250, 330, 400) from various years (check your specific model to be sure!). Mounting hole size is 6.5mm with a center distance of 38mm. Please note: this is not an original Polaris part, but it’s made to meet or exceed OEM specs. A reliable, affordable solution to get your ATV’s braking performance back on track. Always double-check fitment before ordering!