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Ensuring your vehicle's braking system operates efficiently and reliably is paramount for safety. A critical component, the brake pressure relay, plays a vital role in modulating brake pressure. Selecting the correct replacement part guarantees optimal performance and peace of mind while driving.
Enhanced Safety: Ensures continuous brake pressure on the trailer, preventing accidental movement when the vehicle is stationary
Package Contents:1* Trailer Relay
【Brand Store】If the product is defective or damage upon arrival, or if you don't want it any more, or the product cannot fix your issue, please contact us immediately, we will provide assist to solve the problem ASAP
Designed as a direct replacement for Type R-12V air brake relay valves; features 4 delivery ports (1/2" NPT), 1 supply port (1/2" NPT), and 1 control port (1/4" NPT) with 4.0 PSI crack pressure.
Optimized for heavy-duty truck and trailer air brake systems; supports fast relay response and consistent brake signal distribution.
Built with durable, corrosion-resistant components; meets OE specifications for performance and reliability in harsh operating environments.
Fully compatible with popular OEM and aftermarket units including Bendix, Haldex, Caterpillar, Freightliner, Mack, Navistar, and more.
Includes 1 World American R-12 relay valve (MWT 102626); NPT-threaded ports, compliant with DOT regulations. Prop 65 warning included on packaging.
【Complete Control Kit for Your Brake Vacuum System】This bundle includes both the essential 28146 vacuum switch and the 28146 relay, providing a comprehensive solution to manage your electric vacuum pump. Ensures your brake booster receives consistent...
【Automatic Adjustment System】The vacuum pressure switch features a preset activation/deactivation point (typically 18-22 inHg). It automatically turns the pump on when vacuum drops and shuts it off once sufficient vacuum is reached, preventing the...
【28146 Relay for Circuit Protection】The included 28146 relay is designed to handle the high current draw of your electric vacuum pump. By using this relay, you protect your vehicle's wiring, ignition switch, and the vacuum switch itself from...
【 Easy Installation with Clear Wiring Guide】Installation is straightforward with the included relay wiring diagram. Terminals are clearly defined for connection to the vacuum switch, positive battery source, pump motor, and ground.
【Durable design】Both components feature robust construction.Built to withstand the harsh conditions under the hood, this kit offers a reliable, long-lasting upgrade for your braking system.
Air Brake Relay Valve Type R12 – World American SSA 065104 is a high-quality Type R12 relay valve designed for heavy-duty truck brake systems. Compatible with NPT-threaded ports and direct replacement for OE-style valves.
Port Configuration – Equipped with 4 delivery ports (3/8"), a 1/2" supply port, and a 1/4" service (control) port. NPT thread ensures easy, leak-free installation on compatible air systems.
Reliable Performance – Features 4 PSI cracking pressure and supports stable brake actuation under demanding road and load conditions. Ideal for quick response times in air brake systems.
Direct Aftermarket Replacement – Replaces OEM units from Bendix, Haldex, Navistar, Automann, Freightliner, Mack, Meritor, Euclid, and others. Designed for exact fit and long-term reliability.
Package Contents & Compliance – Includes one R12 relay valve (SSA 065104) in sealed packaging. Meets or exceeds OE standards.
【Complete Control Kit for Your Brake Vacuum System】This bundle includes both the essential 28146 vacuum switch and the 28146 relay, providing a comprehensive solution to manage your electric vacuum pump. Ensures your brake booster receives consistent...
【Automatic Adjustment System】The vacuum pressure switch features a preset activation/deactivation point (typically 18-22 inHg). It automatically turns the pump on when vacuum drops and shuts it off once sufficient vacuum is reached, preventing the...
【28146 Relay for Circuit Protection】The included 28146 relay is designed to handle the high current draw of your electric vacuum pump. By using this relay, you protect your vehicle's wiring, ignition switch, and the vacuum switch itself from...
【 Easy Installation with Clear Wiring Guide】Installation is straightforward with the included relay wiring diagram. Terminals are clearly defined for connection to the vacuum switch, positive battery source, pump motor, and ground.
【Durable design】Both components feature robust construction.Built to withstand the harsh conditions under the hood, this kit offers a reliable, long-lasting upgrade for your braking system.
Precision-manufactured World American RG-3 relay valve for heavy-duty brake systems; designed with 5.5 PSI crack pressure and 90° control port configuration for reliable air pressure control.
Dual 1/2" NPT delivery ports and reservoir ports ensure optimal airflow and fast response in 2-port brake setups; built to handle high-duty cycles under harsh operating conditions.
Features 0.25" NPT control port, 0.5" NPT supply ports, and total dimensions of 3-1/2" x 3-5/8"; mounting center-to-center spacing is 1.5" with 0.35" mounting holes.
Durable, corrosion-resistant construction suited for air brake systems in commercial trucks and trailers; thread type: NPT, core group: 225.
Includes (1) relay valve; direct replacement for OE and aftermarket part numbers from Haldex, Wabco, Meritor, Freightliner, Velvac, Euclid, Automann, and others.
【Complete Control Kit for Your Brake Vacuum System】This bundle includes both the essential 28146 vacuum switch and the 28146 relay, providing a comprehensive solution to manage your electric vacuum pump. Ensures your brake booster receives consistent...
【Automatic Adjustment System】The vacuum pressure switch features a preset activation/deactivation point (typically 18-22 inHg). It automatically turns the pump on when vacuum drops and shuts it off once sufficient vacuum is reached, preventing the...
【28146 Relay for Circuit Protection】The included 28146 relay is designed to handle the high current draw of your electric vacuum pump. By using this relay, you protect your vehicle's wiring, ignition switch, and the vacuum switch itself from...
【 Easy Installation with Clear Wiring Guide】Installation is straightforward with the included relay wiring diagram. Terminals are clearly defined for connection to the vacuum switch, positive battery source, pump motor, and ground.
【Durable design】Both components feature robust construction.Built to withstand the harsh conditions under the hood, this kit offers a reliable, long-lasting upgrade for your braking system.
Replacement for Bendix R-12; Devery Ports: (4) 1/2"
Supply Ports: 1/2"; Control Ports:1/4"
Crack Pressure: 4 PSI; Core Group: 121RLV
Vertical Devery Ports
18 MONTHS WARRANTY* - This product is covered for one year or completion of 100,000 miles since installation or 18 months after your purchase, whichever comes first. Please check below for complete information.
Last update on 2026-09-08 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Automotive Replacement Brake Pressure Relays
Comparison Tips
When comparing different brake pressure relays, prioritize OEM-equivalent parts for guaranteed fit and function. Read customer reviews to gauge real-world performance and durability, paying attention to comments about ease of installation and longevity. Ensure the part number listed matches your vehicle's original component or a confirmed cross-reference. Consider the warranty offered by the manufacturer as an indicator of product confidence and a safeguard for your investment.
Frequently Asked Questions
What is the main function of a brake pressure relay?
The primary function of a brake pressure relay is to control and adjust the amount of hydraulic pressure sent to the rear brakes. It helps prevent premature rear-wheel lock-up, ensuring safer and more stable braking.
How do I know if my brake pressure relay needs replacing?
Symptoms of a failing relay include uneven braking, a spongy brake pedal, or the rear wheels locking up too easily. A thorough brake inspection by a mechanic is the best way to diagnose issues.
Can I use a universal brake pressure relay?
While universal parts exist, it's generally recommended to use a relay specifically designed for your vehicle's make and model. This ensures proper fitment and optimal performance of your braking system.
Is replacing a brake pressure relay a DIY job?
Replacing a brake pressure relay can be a complex task that often requires bleeding the brake system. It is typically recommended for individuals with automotive repair experience or to be performed by a professional mechanic.
What is the difference between a brake pressure relay and a master cylinder?
The master cylinder generates the initial hydraulic pressure when you press the brake pedal. The brake pressure relay then modifies this pressure, specifically for the rear brakes, to optimize stopping power and stability.
How long do brake pressure relays typically last?
The lifespan of a brake pressure relay can vary depending on driving conditions and the quality of the part. However, they are designed to last for many years and thousands of miles, often outlasting other brake components.
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