PROLINE PL-21103CR 1 1/2"-10SP AUTO SLACK 51 1/2"-10SP AUTO SLACK 5

Proline® is an American manufacturer and distributor of braking systems for commercial vehicles. It specializes in direct OEM replacement brake chambers, automatic and manual slack adjusters, air brake calipers and rotors, brake pads, and other air brake system components. Each part is made of premium domestic or imported materials and engineered to meet or exceed OE specifications. All Proline products are made, assembled, and/or tested in-house at the company’s factory in Tennessee using its own dies, tooling, assembly equipment, and testing lines. These not only ensure consistently high quality for each part but also compliance with SAE, DOT, and FMVSS-121 standards.