Street Rod Headquarters » Brakes » Master Cylinder » Discontinued Item: This item is discontinued. Please CALL to see if there is a replacement or an alternative. (Mouse over any image to view) Brake Metering Valve (Front Disc Brake Hold-Off) Item # EC-526 These valves are used for the front disc brakes in a disc/drum braking system to provide a "hold-off" feature so as to allow the rear drum brakes to actuate first. This function is essential for correct system operation. Accepts 3/16" brake lines. This part fits most Cars and Trucks.; exceptions may apply. Please read the complete description to see if this part fits your specific vehicle and application. Share | Discontinued Item Reviews Product Reviews Login to Write A Review Fits Vehicle Models Street Rod Parts - Product Fits Vehicle Models There are no specific vehicled models specificied for this part.