Caterpillar 4D-2289 Valve

Caterpillar 4D-2289 Valve A is the Cat brake air control valve identified by part number 4D-2289 and designated Valve A in official Cat documentation. This valve is a component within the brake control system on Caterpillar equipment, responsible for modulating pressurized air to the braking actuation to maintain consistent brake response. CAT Parts Store lists the product as 4D-2289 VALVE A, confirming its role as the valve assembly used in the Cat braking network. Retail and aftermarket listings also describe 4D-2289 as a brake air control valve (Valve A), reflecting its function across Cat machines that use this valve assembly. The part is stocked by Cat-authorized distributors and is commonly offered as either Cat original equipment or aftermarket replacement under the same 4D-2289 designation, with several retailers explicitly naming it as Valve A for the 4D-2289 kit. Typical applications include Caterpillar heavy equipment that specifies 4D-2289 in its service parts catalog; always verify compatibility with your machine model and serial number through the official parts catalog or a Cat-authorized distributor. The 4D-2289 Valve A is part of Caterpillar’s braking-system components catalog and is recognized by multiple suppliers as the valve component in the 4D-2289 valve assembly.