Chassis, etc. MGM Brakes Long Stroke Spring Brakes ' Service Chambers TR-LP3 ' LTR-L3 'Long Stroke' spring brake models offer performance benefits over standard stroke brake chambers for better lifetime value: 3.0" of stroke, greater reserve of stroke (1/2" more than 2.50" std. stroke models) meet or exceed worldwide industry safety standards and improved braking efficiency ' reduced out-of-adjustment incidents.