BD Diesel 1120100 Exhaust Brake Air Cylinder Assembly Replacement Part Universal

Vehicle Fitment

• Universal - fits all BD Diesel air-actuated exhaust brake systems installed on Dodge / Ram, Ford, and GM diesel trucks; fitment is determined by the BD exhaust brake model installed on the vehicle, not by the vehicle directly
• Compatible with BD Diesel air-cylinder exhaust brake systems including turbo-mount and remote-mount air-actuated configurations (Dodge Cummins, Ford Power Stroke, GM Duramax applications)
• Confirm your BD exhaust brake model uses an air cylinder actuator (newer-style BD brakes) rather than a vacuum cylinder (earlier-style BD brakes) before ordering

Fitment Notes

• This is a replacement service component - it is NOT a complete exhaust brake kit
• Intended for owners servicing or rebuilding an existing BD Diesel air-actuated exhaust brake that has a failed, worn, or damaged air cylinder
• For the companion quick release valve replacement component, see BD Diesel part number 1120121
• If the existing exhaust brake uses a vacuum cylinder (earlier BD brake models), the vacuum spool control valve replacement is a different service part - confirm actuator type before ordering

Features

• Direct replacement spring-loaded air cylinder assembly for BD Diesel air-actuated exhaust brake systems - restores full butterfly valve actuation when the air cylinder is engaged
• When the exhaust brake is activated, the air cylinder applies force to close the offset stainless steel butterfly valve inside the exhaust brake housing, generating exhaust backpressure for engine retarding
• Spring-loaded design ensures the butterfly valve returns to the fully open position when the brake is deactivated - preventing exhaust restriction during normal driving
• Engineered to withstand the high-heat and high-vibration environment of a diesel exhaust system - the same durability standard applied to all BD Diesel exhaust brake components
• Replaces a worn, seized, or failed air cylinder to restore proper exhaust brake engagement and release
• Designed to work with BD's Variable Orifice Technology exhaust brake system - which delivers retarding power across the full engine RPM range, not just at high RPM

Specifications

• Part Number: 1120100
• Part Type: Exhaust Brake Air Cylinder Assembly (Replacement Service Component)
• Actuator Type: Spring-Loaded Air Cylinder
• Application: BD Diesel Air-Actuated Exhaust Brake Systems (Universal)
• Position: Butterfly Valve Actuator

Included Components

• 1x Spring-Loaded Air Cylinder Assembly (BD Diesel 1120100)

Product Description

The BD Diesel 1120100 is a replacement spring-loaded air cylinder assembly for BD Diesel's air-actuated exhaust brake systems. It is a service and maintenance component - not a complete exhaust brake kit - designed for owners who need to restore proper actuation function to an existing BD Diesel exhaust brake whose air cylinder has failed, worn out, or become seized. The air cylinder is the mechanism that physically closes the butterfly valve inside the exhaust brake housing when the brake is engaged: pressurized air from the vehicle's on-board compressor drives the cylinder, which in turn closes the offset stainless steel butterfly valve against the exhaust stream to generate the backpressure that creates engine retarding force. When the brake is disengaged, the spring inside the cylinder returns the butterfly to the fully open position, restoring unobstructed exhaust flow for normal driving.

BD Diesel has been manufacturing exhaust brakes since 1989 - the company introduced the first exhaust brake designed for diesel pickup trucks - and their air-cylinder actuation design is a hallmark of their newer-generation exhaust brake systems, which replaced the earlier vacuum-cylinder style. The spring-loaded air cylinder is a critical component of BD's Variable Orifice Technology system, which uses the butterfly's offset design and pressure self-regulation to deliver retarding power throughout the full engine RPM range, not just at high RPM as is common with competing exhaust brake designs. A failed or sluggish air cylinder manifests as slow engagement, incomplete butterfly closure, insufficient backpressure, or failure to release - all of which reduce the effectiveness and safety of the exhaust brake during towing or downhill driving.

This cylinder assembly is compatible with BD Diesel air-actuated exhaust brake systems across Dodge/Ram Cummins, Ford Power Stroke, and GM Duramax platforms. Because this is a universal service component matched to the BD exhaust brake system rather than to a specific vehicle, owners should confirm their BD exhaust brake uses an air cylinder actuator (as opposed to a vacuum cylinder, used on older BD brake models) before ordering. For the quick release valve that is part of the same service parts family, see BD Diesel part number 1120121. BD Diesel's exhaust brake replacement components are stocked to support the full service life of their exhaust brake systems, ensuring that a single failed component does not require replacement of the entire brake assembly.