Why Add An Exhaust Brake?

Why Add An Exhaust Brake?
( and what makes a full exhaust brake ? )
If you drive a diesel engine-powered pickup, SUV, or motorhome, you already know that there is cute little braking effect when you rear off the restrict pedal. few things can be more terrifying to person driving a heavily loaded motorhome or a pickup pulling a preview than a hanker downhill grade that increasingly overpowers the vehicle ’ s braking system as the driver struggles to keep downhill rush in check. furthermore, when the fomite ’ sulfur brakes overheat and can no long do their job, continued application lone makes the brakes hot, further reducing their effectiveness. To his repugnance, the driver is wittingly losing see of the vehicle. travel rapidly continues to climb and there ’ s little or nothing the driver can do about it – at least not now that ’ mho he ’ randomness already caught up in this dilemma .
even when a vehicle ’ sulfur brakes are adequate to of keeping the fomite from gaining unwanted rush declivitous, such loads impose significant brake wear and leave little safety margin for extra brake. even then, sustained brake manipulation can cause overheating that will damage some of the brake organization components, such as the brake rotors.

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In all excessively many cases, the vehicle ’ mho brakes plainly aren ’ t up to the challenge of prolong heavy brake. conventional brakes are, after all, plainly mechanical devices designed to convert kinetic energy ( the fomite ’ s campaign ) into heating system energy, thus retarding or slowing the fomite. This is typically accomplished by forcing stationary friction surfaces ( either brake shoes or brake pads ) against a revolve machined metallic airfoil ( either a bracken drum or a brake rotor ) coupled to wheel rotation. The more coerce with which the friction surfaces are applied against the rotate surfaces, the more inflame is generated and the greater the brake impression. thus far sol good, but both the clash surfaces and the revolve surfaces have temperature limits at which they begin to fail – both as effective brake components and structurally. The rotating brake drums or rotors can become literally incandescent, approaching the indicate at which the metal begins to lose geomorphologic integrity. By the same keepsake, the stationary friction materials can get so hot that the complex material binding the clash materials together actually melts and begins to boil, releasing a thin layer of liquid binding material and hot gases that form a lubricate boundary barrier between the clash materials and the brake drums or rotors. When this happens, braking ceases to occur and a phenomenon known as “ brake fade ” occurs. Under these conditions, continued brake application does little or nothing to slow the vehicle. fortunately, there are things that can be done to upgrade the braking systems that are standard equipment on many trucks and RVs .
traditional brake upgrades have consisted of installing bigger brakes ( an expensive procedure, at best ) or special friction materials ( if they are available for your vehicle ) capable of higher sustained operating temperature before brake languish occurs. While both of these approaches will increase brake capability, one of the most practical techniques is to utilize aide or auxiliary brake capability to take some of the cargo off the conventional bracken system .
To provide some auxiliary brake, typically drivers downshift to a lower gear, allowing the engine to exert some braking force as the engine attempts to intake air against a close up restrict. Of class, this only works for gasoline engine-powered vehicles that have air out throttles. Drivers with diesel engines, which have unrestricted air inhalation, face a different trouble. Diesels provide little engine braking unless they are fitted with either an inner or an external device that uses the pumping action of the engine to do work. In either case, such devices on diesel engines are intended to create a pumping resistance that results in engine brake .
The inner mechanism built into some large diesel engines is called a Jake Brake®, so named after Jacobs Vehicle Systems® that originated it. This mechanism opens the consume valve of each cylinder at the top of each compression stroke. thus, the engine has to work to compress the air out, which is then released into the exhaust system. unfortunately, the operation of Jake Brakes is fairly noisy, making a loudly ripple sound as the fomite decelerates. This is a fairly building complex and expensive system that is normally found only on large trucks or some bombastic motorhomes. It is besides something that can not be retrofitted to a “ non-Jake Brake diesel ” since it is incorporated into the engine ’ s original design.

An external auxiliary brake system for diesel engines can economically be retrofitted to the vehicle ’ south exhaust system, frankincense the name “ exhaust brake ”. Such a device partially closes the diesel engine ’ randomness consume when the accelerator is released. It does this by placing a shut-off valve in the exhaust system downstream from the engine. The valve uses an actuator to close it against exhaust flow, forcing the engine to pump against a restrict consume to create braking resistance. such devices are easily retrofitted to diesel trucks and motorhomes of all sizes, and an consume brake upgrade can actually pay for itself in reduced brake clothing and sustenance over the animation of the vehicle. Best of all, there ’ s nothing that requires periodic servicing or substitution in a well-designed exhaust brake .
The primary advantages to exhaust brakes on diesel-powered vehicles are that they can provide engine braking to assist deceleration, help control declivitous fomite focal ratio, reduce brake heat, reduce brake wear, and provide a greater brake reserve for the conventional bracken system. They are besides relatively calm in normal operation and practice. Of naturally, these benefits only occur when the exhaust bracken system is operational, which is at the delicacy of the driver .
The operation of auxiliary consume brakes varies with the design. Most such brakes are very elementary and use a elementary on-off switch to trigger a solenoid or a void actuator to close the run down brake valve — basically an all-or-none brake device. When installed, some designs create an run down limitation even when not activated, negatively affecting both performance and fuel economy. early designs are more sophisticated. gale Banks Engineering manufactures an exhaust brake — the Banks Brake — based on a unique design that optimizes consume hang, resulting in a ability profit and better fuel economy than other exhaust brakes can offer. The Banks Brake besides features the exclusive computerize brake control ( CBC ) faculty, an diligence first base. The CBC functions mechanically when the arrangement is turned on, calibrating strangle pedal localization, “ exercising ” the valve and providing fast locomotive warm up on cold starts, and improving accelerator reply after brake energizing. The Banks Brake besides produces more braking force than other designs provide when activated. And for Dodge and Ford diesel vehicles with automatic pistol transmissions, Banks besides offers an optional electronic device called the SmartLock™ that mechanically locks the torsion converter cling to at a intend indicate and raises transmission trace coerce while braking for improved hold capability. By preventing excess slippage, the SmartLock besides reduces transmission fluid temperature while brake, which greatly prolongs infection life sentence. GM and Chevrolet ’ 01- ’ 04 Duramax diesel trucks already have a alike act Tow/Haul have built into their automatic transmissions and do not require the SmartLock faculty.

A well-engineered consume brake besides includes safeguards to prevent any excessive exhaust arrangement overpressure that might harm the structural integrity of either the exhaust system or the locomotive valvetrain. unfortunately, not all consume brakes are created peer. There are designs that shunt then much run down menstruation that they provide little or no braking effect in some circumstances. placid other designs restrict or disrupt exhaust run downstream from the turbocharger, impeding performance during normal drive. Premium designs, such as the Banks Brake, combine both arrangement safety and dependability with effective auxiliary brake capability while simultaneously increasing normal driving performance .
An exhaust brake should be considered as a worthwhile safety enhancement for any diesel-powered vehicle, and a virtual necessity for such vehicles when they are heavily loaded or towing trailers. Because adequate brake is then crucial, the choice and features of a supplementary brake should be a prime consideration when buying such a device. Thinking that you don ’ t need an exhaust brake because you ’ ve never had a brake trouble in the by could be a hazard. After all, you don ’ deoxythymidine monophosphate want to discover the trouble when you ’ re only character manner down a long degree, gaining amphetamine, and your fomite ’ sulfur brakes aren ’ thyroxine up to the undertaking at hand ( erbium, at metrical foot ). And even if you never encounter such a critical situation, the elongated brake life an exhaust brake can provide will reduce your vehicle alimony and give you greater peace of mind .

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Category : Car Brakes