Detroit Diesel DD15 Air Brake Compressor, 2008-2015 (EA4721300815)

On a heavy truck the air compressor is what keeps the brakes working. If the air tanks fill slowly, the governor keeps cutting in, or you find oil in the air lines, the compressor is usually the first thing to look at. This DD15 air brake compressor is a replacement unit for Detroit Diesel DD15 engines from 2008 to 2015.

OE and cross reference numbers

4721300815, 4721300515, EA4721300815, RA4721300815, EA4721301115

Fit

• Detroit Diesel DD15, 2008-2015

The DD15 is used in Freightliner and Western Star trucks among others. Match the part number on your old compressor and compare it with the photos before you order.

What's in the box

• 1 x truck air brake compressor

Fitting the DD15 air brake compressor

Drain the air tanks fully before you loosen any lines, and replace the gaskets and coolant lines that go to the compressor at the same time. After fitting, check build-up time and the governor cut-out pressure against your truck's spec. If you want the basics of how truck air systems work, Wikipedia has a solid page on air brakes for road vehicles. This is a job for a qualified heavy vehicle mechanic.

Fleet and truck owners can find more in our truck and commercial parts, diesel parts and brake parts. The Ram 2500 and 3500 hydroboost brake booster is there for heavy pickups too. Shipping is free on every order, and delivery details are on our shipping page.