Our Knott 250 x 40mm Trailer Brake can be bought as a full backplate assembly for a complete replacement of existing trailer brakes. We also offer a vast range of spare parts for trailer brakes, such as the Expander, Adjuster and the Brake Shoes, which enable you to replace certain elements of your trailer brakes. The Trailer Brake Drums shown in this listing are Bradley and Ifor Williams. These all use the Knott 250 x 40mm Brake and are available to purchase in different PCD measurements and drum series. If you cannot see the part you require, please call 01909 473749.