Pressure Regulated Exhaust Brake offers the highest retarding power for the lowest price available. PRXB’s retarding power is comparable to that of a compression release engine brake. However, it's manufacturing and installation costs are significantly less.
With over a quarter of a million exhaust brakes manufactured and sold, Pacbrake has mastered quality product development. Being home to the only exhaust brake on the market with a true variable orifice, remarkable constant backpressure and strongest braking horsepower, Pacbrake has revolutionized modern day exhaust braking with its patented design of the PRXB.
In order to have consistent and effective braking over the entire RPM range, it is essential to maintain constant back pressure. To achieve this, Pacbrake’s patented design has incorporated an additional waste gate on the butterfly valve to regulate the amount of exhaust flow. The flow is controlled by a spring-loaded arm, whose pressure rating and location are key factors in the functionality of the PRXB. Located outside of the housing and away from the heat, the spring is able to maintain its strength and durability for years of proper and precise braking performance.
When the exhaust flow enters the housing and hits a closed butterfly valve, it is forced back out. This process creates the required back pressure. A calibrated spring that is located on the outside of the exhaust brake housing maintains this back pressure. As the engine’s RPM increases, the spring compresses moving the arm away from the butterfly. This process releases more exhaust flow through the orifice. As the RPM decreases, the spring extends and the arm moves the plate, which covers the hole. This ultimately allows a smaller amount of exhaust flow past.