{"product_id":"5102081aa-genuine-cummins®-onan-brake-exhaust","title":"5102081AA | Genuine Cummins® Onan BRAKE,EXHAUST","description":"\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e: Onan BRAKE,EXHAUST\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e: New\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5102081AA\u003cbr\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e: Cummins\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003e1. Compatible Engine Families\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003eThis exhaust brake assembly is engineered specifically for Cummins medium-duty, high-torque diesel platforms. It is widely used on:\u003c\/p\u003e\n\u003cul data-path-to-node=\"5\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,0,0\"\u003e\u003cb data-path-to-node=\"5,0,0\" data-index-in-node=\"0\"\u003eCummins ISB Series (5.9L and 6.7L)\u003c\/b\u003e Inline-6 turbo diesel engines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,1,0\"\u003e\u003cb data-path-to-node=\"5,1,0\" data-index-in-node=\"0\"\u003eCummins ISC Series (8.3L)\u003c\/b\u003e and select \u003cb data-path-to-node=\"5,1,0\" data-index-in-node=\"37\"\u003eQSB industrial variants\u003c\/b\u003e used in high-capacity mobile platforms.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003cb data-path-to-node=\"6\" data-index-in-node=\"0\"\u003e2. Common Vehicle Types \u0026amp; Applications\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003eBecause it is designed to manage the kinetic energy of heavy vehicles descending steep grades, this part is commonly fitted to the following applications:\u003c\/p\u003e\n\u003cul data-path-to-node=\"8\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,0,0\"\u003e\u003cb data-path-to-node=\"8,0,0\" data-index-in-node=\"0\"\u003eLuxury Class A Motorhomes \u0026amp; Diesel Pushers:\u003c\/b\u003e High-end recreational vehicles built on Freightliner, Spartan, or custom chassis powered by Cummins ISB\/ISC engines, where heavy braking is required without overheating the service brakes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,1,0\"\u003e\u003cb data-path-to-node=\"8,1,0\" data-index-in-node=\"0\"\u003eMedium-Duty Trucks \u0026amp; Haulers:\u003c\/b\u003e Flatbeds, dump trucks, and commercial tow vehicles (like the Freightliner M2 or older RAM 4500\/5500 chassis using specialized auxiliary exhaust retarding configurations).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,2,0\"\u003e\u003cb data-path-to-node=\"8,2,0\" data-index-in-node=\"0\"\u003eSpecialty Heavy Utility Vehicles:\u003c\/b\u003e Mobile command centers, large fire apparatuses, and commercial transport buses built on Cummins-powered vocational chassis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe Onan Exhaust Brake is an original equipment manufacturer (OEM) supplemental vehicle retarding system engineered by Jacobs Vehicle Systems in partnership with Cummins.\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003e1. What is it?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\" id=\"p-rc_29894afea8cf6d8b-59\"\u003e\u003cspan class=\"citation-108 citation-end-108\"\u003eOften referred to simply as an \"E-Brake\" or \"Jake Brake,\" this cast iron assembly mounts directly downstream of the engine's turbocharger exhaust outlet.\u003csup class=\"superscript\" data-turn-source-index=\"1\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-107 citation-end-107\"\u003eIt acts as an auxiliary slowing system for medium-duty trucks and heavy vehicles, working entirely through engine backpressure.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003e\u003cb data-path-to-node=\"5\" data-index-in-node=\"0\"\u003e2. Core Functions\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"6\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,0,0\" id=\"p-rc_29894afea8cf6d8b-60\"\u003e\u003cb data-path-to-node=\"6,0,0\" data-index-in-node=\"0\"\u003eExhaust Throttling Resistance:\u003c\/b\u003e When activated by the driver, a heavy internal butterfly flap rotates shut inside the housing. \u003cspan class=\"citation-106 citation-end-106\"\u003eThis severely restricts the escaping exhaust gases, creating a pocket of high backpressure pushing against the rising pistons.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-105 citation-end-105\"\u003eThis pneumatic resistance slows down the crankshaft rotation, translating into substantial vehicle braking horsepower.\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,1,0\" id=\"p-rc_29894afea8cf6d8b-61\"\u003e\u003cb data-path-to-node=\"6,1,0\" data-index-in-node=\"0\"\u003eService Brake Preservation:\u003c\/b\u003e By utilizing the engine's air pressure to control speeds on steep, mountain descents, it relieves the vehicle's standard drum\/disc service brakes. \u003cspan class=\"citation-104 citation-end-104\"\u003eThis eliminates the risk of dangerous brake fade, overheating, or friction pad glaze.\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,2,0\" id=\"p-rc_29894afea8cf6d8b-62\"\u003e\u003cb data-path-to-node=\"6,2,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-103 citation-end-103\"\u003eThermal Management:\u003csup class=\"superscript\" data-turn-source-index=\"6\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/b\u003e \u003cspan class=\"citation-102 citation-end-102\"\u003eOn modern layouts, the system can selectively close the exhaust throttle during cold idles to increase engine load, allowing the vehicle to reach proper operating temperatures faster and reducing emissions output\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSigns of Faulty\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"4\"\u003e\u003cb data-path-to-node=\"4\" data-index-in-node=\"0\"\u003e1. Weak or Completely Missing Braking Force\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003eThe most common symptom is a noticeable lack of vehicle retardation when descending steep grades. If you flip the dashboard toggle switch and the vehicle does not slow down on its own, the internal \u003cb data-path-to-node=\"5\" data-index-in-node=\"198\"\u003ebutterfly valve\u003c\/b\u003e may be stuck wide open, or the \u003cb data-path-to-node=\"5\" data-index-in-node=\"245\"\u003eair cylinder\u003c\/b\u003e actuator may have lost pressure supply.\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003cb data-path-to-node=\"6\" data-index-in-node=\"0\"\u003e2. Sluggish Acceleration or Severe Loss of Engine Power\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003eIf the internal valve becomes carbon-fouled and jams in the \u003ci data-path-to-node=\"7\" data-index-in-node=\"60\"\u003eclosed\u003c\/i\u003e or \u003ci data-path-to-node=\"7\" data-index-in-node=\"70\"\u003epartially closed\u003c\/i\u003e position, it continuously chokes the engine's exhaust stream during normal driving. This causes massive, unintended exhaust backpressure, resulting in a dramatic drop in turbo boost, sluggish acceleration, and a feeling that the vehicle is \"fighting itself.\"\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003e\u003cb data-path-to-node=\"8\" data-index-in-node=\"0\"\u003e3. Audible Air Hissing or Exhaust Leaks\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"9\"\u003eThe actuator cylinder relies on positive air pressure to manipulate the internal valve linkage. If an internal seal ruptures or the external supply line cracks, you will hear a distinct air-hissing sound when the system engages. Additionally, a warped exhaust brake housing can cause exhaust gases to blow past the mounting flanges, producing a loud ticking or whistling noise in the engine bay.\u003c\/p\u003e\n\u003cp data-path-to-node=\"10\"\u003e\u003cb data-path-to-node=\"10\" data-index-in-node=\"0\"\u003e4. \"Stuck\" Switch or Delay in Disengagement\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"11\"\u003eWhen you tap the accelerator pedal, the exhaust brake should immediately snap open to clear the exhaust path. If the return spring inside the actuator is broken or the mechanical linkage is binding due to road salt and rust, the brake will stay applied too long, causing a violent jerking sensation or delayed acceleration when trying to speed up.\u003c\/p\u003e\n\u003cp data-path-to-node=\"12\"\u003e\u003cb data-path-to-node=\"12\" data-index-in-node=\"0\"\u003e5. Excessive Exhaust Smoke or High EGTs (Exhaust Gas Temperatures)\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"13\"\u003eA partially seized valve forces the engine to work much harder to push spent air out of the cylinders. This restriction disrupts the clean air-to-fuel ratio, spiking your Exhaust Gas Temperatures (EGTs) to dangerous levels and producing noticeable black smoke under standard highway cruising conditions.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eCummins®\u003c\/strong\u003e is a worldwide leader in the production of engines, agricultural components, and other power-generating devices for various industries, including medium and heavy duty trucks, light commercial vehicles, buses, agriculture, and construction. Founded in 1919, this company stays true to its mission of making people's lives better by continuously improving its product line-up and introducing new solutions for a more prosperous world. Its core values—integrity, diversity and inclusion, excellence, caring, and teamwork—are what make it a successful company today—a worldwide leader with a network of more than 600 company-owned and independent distributors and almost 6,000 dealers in approximately 190 countries.\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days\u003c\/strong\u003e \u003cstrong\u003ewarranty\u003c\/strong\u003e for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.\u003c\/p\u003e","brand":"Cummins®","offers":[{"title":"Default Title","offer_id":48842412949748,"sku":"5102081AA","price":1199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/4089280-genuine-cummins-exhaust-brake-advanced-truck-parts-23629_1600x_2d6aa19a-aaf4-4be9-995d-82f2a8500d8b.jpg?v=1783555426","url":"https:\/\/firsttruckparts.com\/products\/5102081aa-genuine-cummins%c2%ae-onan-brake-exhaust","provider":"First Truck Parts","version":"1.0","type":"link"}