{"product_id":"165-043-0001-genuine-international®-air-brake-compressor-ba-921-for-maxxforce-13-11","title":"K044642 | Genuine International® Air Brake Compressor BA-921 For MaxxForce 13, 11","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e Twin Air Brake Compressor BA-921 For MaxxForce 13, 11\u003cbr\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003cbr\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e International®\u003cbr\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e K044642\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment Guide:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"1r39aj\" data-start=\"244\" data-end=\"271\"\u003eInternational ProStar\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"deuurz\" data-start=\"272\" data-end=\"300\"\u003eInternational TranStar\u003c\/li\u003e\n\u003cli data-section-id=\"11rp6lq\" data-start=\"301\" data-end=\"329\"\u003eInternational LoneStar\u003c\/li\u003e\n\u003cli data-section-id=\"1vq2rbb\" data-start=\"330\" data-end=\"358\"\u003eInternational WorkStar\u003c\/li\u003e\n\u003cli data-section-id=\"1cammb2\" data-start=\"359\" data-end=\"386\"\u003eInternational PayStar\u003c\/li\u003e\n\u003cli data-section-id=\"1k9e7q5\" data-start=\"387\" data-end=\"533\"\u003eOther International\/Navistar trucks equipped with MaxxForce 11 or MaxxForce 13 diesel engines.\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\u003cdiv data-is-intersecting=\"true\" data-turn-id-container=\"request-WEB:c26db2ab-c39d-4970-af62-e52da91e8f89-0\" class=\"\"\u003e\n\u003csection data-turn=\"assistant\" data-scroll-anchor=\"false\" data-testid=\"conversation-turn-2\" data-turn-id-container=\"request-WEB:c26db2ab-c39d-4970-af62-e52da91e8f89-0\" data-turn-id=\"request-WEB:c26db2ab-c39d-4970-af62-e52da91e8f89-0\" dir=\"auto\" class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-turn-start-message=\"true\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-message-model-slug=\"gpt-5-5\" dir=\"auto\" data-message-id=\"3494250e-28a0-46aa-bc56-c0d575503b58\" data-message-author-role=\"assistant\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp data-end=\"251\" data-start=\"0\"\u003eA\u003cstrong\u003e \u003c\/strong\u003ecylinder air brake compressor\u003cstrong\u003e \u003c\/strong\u003eis a mechanical pump used on vehicles with air brake systems -\u003cstrong data-end=\"107\" data-start=\"86\"\u003e \u003c\/strong\u003ecommonly heavy trucks, buses, trains, and some industrial equipment. Its job is to compress air and supply pressurized air to the brake system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-end=\"619\" data-start=\"575\"\u003e\u003cstrong\u003e1. Supply air pressure for safe braking\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"694\" data-start=\"620\"\u003eThe compressor keeps the air tanks filled so the brakes can work reliably.\u003c\/p\u003e\n\u003cp data-end=\"724\" data-start=\"696\"\u003e\u003cstrong\u003e2. Simpler construction\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"759\" data-start=\"725\"\u003eWith only one cylinder and piston:\u003c\/p\u003e\n\u003cul data-end=\"829\" data-start=\"760\"\u003e\n\u003cli data-end=\"781\" data-start=\"760\" data-section-id=\"kj6hav\"\u003efewer moving parts,\u003c\/li\u003e\n\u003cli data-end=\"801\" data-start=\"782\" data-section-id=\"oedxzp\"\u003eeasier servicing,\u003c\/li\u003e\n\u003cli data-end=\"829\" data-start=\"802\" data-section-id=\"pf5i4u\"\u003elower manufacturing cost.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"874\" data-start=\"831\"\u003e\u003cstrong\u003e3. Good for moderate-duty applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"890\" data-start=\"875\"\u003eWorks well for:\u003c\/p\u003e\n\u003cul data-end=\"982\" data-start=\"891\"\u003e\n\u003cli data-end=\"908\" data-start=\"891\" data-section-id=\"3ic35w\"\u003esmaller trucks,\u003c\/li\u003e\n\u003cli data-end=\"917\" data-start=\"909\" data-section-id=\"1cjzbau\"\u003ebuses,\u003c\/li\u003e\n\u003cli data-end=\"935\" data-start=\"918\" data-section-id=\"ubt586\"\u003efarm equipment,\u003c\/li\u003e\n\u003cli data-end=\"959\" data-start=\"936\" data-section-id=\"di7h6k\"\u003eolder heavy vehicles,\u003c\/li\u003e\n\u003cli data-end=\"982\" data-start=\"960\" data-section-id=\"1032j2v\"\u003eindustrial machines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1015\" data-start=\"984\"\u003e\u003cstrong\u003e4. Lower maintenance costs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1126\" data-start=\"1016\"\u003eSingle-cylinder units are generally easier to troubleshoot and rebuild than larger multi-cylinder compressors.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\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-end=\"224\" data-start=\"191\" data-section-id=\"q17y73\"\u003e\u003cstrong\u003e1. Slow air pressure build-up\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"254\" data-start=\"225\"\u003eOne of the most common signs.\u003c\/p\u003e\n\u003cp data-end=\"355\" data-start=\"256\"\u003eThe compressor takes too long to raise tank pressure to operating range (often around 100–125 PSI).\u003c\/p\u003e\n\u003cp data-end=\"372\" data-start=\"357\"\u003eYou may notice:\u003c\/p\u003e\n\u003cul data-end=\"470\" data-start=\"373\"\u003e\n\u003cli data-end=\"406\" data-start=\"373\" data-section-id=\"1xpgvcd\"\u003eWarning buzzer\/light staying on\u003c\/li\u003e\n\u003cli data-end=\"433\" data-start=\"407\" data-section-id=\"1o5gud5\"\u003eLong wait before driving\u003c\/li\u003e\n\u003cli data-end=\"470\" data-start=\"434\" data-section-id=\"scjrm5\"\u003ePressure gauges rising very slowly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"495\" data-start=\"472\" data-section-id=\"6trwnl\"\u003e\u003cstrong\u003e2. Low air pressure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"539\" data-start=\"496\"\u003eThe system cannot maintain normal pressure.\u003c\/p\u003e\n\u003cp data-end=\"558\" data-start=\"541\"\u003ePossible effects:\u003c\/p\u003e\n\u003cul data-end=\"644\" data-start=\"559\"\u003e\n\u003cli data-end=\"582\" data-start=\"559\" data-section-id=\"1xfoyy1\"\u003eWeak braking response\u003c\/li\u003e\n\u003cli data-end=\"618\" data-start=\"583\" data-section-id=\"n7jc54\"\u003eAir brakes not releasing properly\u003c\/li\u003e\n\u003cli data-end=\"644\" data-start=\"619\" data-section-id=\"gs88wt\"\u003eRepeated low-air alarms\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"679\" data-start=\"646\" data-section-id=\"2aqh2p\"\u003e\u003cstrong\u003e3. Compressor runs constantly\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"720\" data-start=\"680\"\u003eThe compressor never seems to “cut out.”\u003c\/p\u003e\n\u003cp data-end=\"849\" data-start=\"722\"\u003eNormally, the governor unloads the compressor at maximum pressure. A failing compressor may struggle to reach cut-out pressure.\u003c\/p\u003e\n\u003cp data-end=\"884\" data-start=\"851\" data-section-id=\"1or54cp\"\u003e\u003cstrong\u003e4. Excessive oil in air tanks\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"953\" data-start=\"885\"\u003eWorn piston rings or seals can allow engine oil into the air system.\u003c\/p\u003e\n\u003cp data-end=\"969\" data-start=\"955\"\u003eSigns include:\u003c\/p\u003e\n\u003cul data-end=\"1064\" data-start=\"970\"\u003e\n\u003cli data-end=\"1004\" data-start=\"970\" data-section-id=\"fnitut\"\u003eOily residue when draining tanks\u003c\/li\u003e\n\u003cli data-end=\"1033\" data-start=\"1005\" data-section-id=\"1r8zom9\"\u003eOil-contaminated air lines\u003c\/li\u003e\n\u003cli data-end=\"1064\" data-start=\"1034\" data-section-id=\"1iytkhq\"\u003eDamaged air brake components\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1099\" data-start=\"1066\" data-section-id=\"189a90h\"\u003e\u003cstrong\u003e5. Excessive moisture buildup\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1198\" data-start=\"1100\"\u003eA weak compressor can overheat or fail to properly manage airflow, leading to excess condensation.\u003c\/p\u003e\n\u003cp data-end=\"1214\" data-start=\"1200\"\u003eYou might see:\u003c\/p\u003e\n\u003cul data-end=\"1291\" data-start=\"1215\"\u003e\n\u003cli data-end=\"1231\" data-start=\"1215\" data-section-id=\"14r2jx5\"\u003eWater in tanks\u003c\/li\u003e\n\u003cli data-end=\"1265\" data-start=\"1232\" data-section-id=\"1ycwef2\"\u003eFrozen airlines in cold weather\u003c\/li\u003e\n\u003cli data-end=\"1291\" data-start=\"1266\" data-section-id=\"1wuli6j\"\u003eCorrosion in the system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1314\" data-start=\"1293\" data-section-id=\"3hdrg6\"\u003e\u003cstrong\u003e6. Unusual noises\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1350\" data-start=\"1315\"\u003eBad internal components can create:\u003c\/p\u003e\n\u003cul data-end=\"1395\" data-start=\"1351\"\u003e\n\u003cli data-end=\"1361\" data-start=\"1351\" data-section-id=\"1fs9ru2\"\u003eKnocking\u003c\/li\u003e\n\u003cli data-end=\"1372\" data-start=\"1362\" data-section-id=\"4fgh0e\"\u003eGrinding\u003c\/li\u003e\n\u003cli data-end=\"1384\" data-start=\"1373\" data-section-id=\"r7m587\"\u003eSquealing\u003c\/li\u003e\n\u003cli data-end=\"1395\" data-start=\"1385\" data-section-id=\"iybo4m\"\u003eClicking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1456\" data-start=\"1397\"\u003eThese may indicate worn bearings, valves, or piston damage.\u003c\/p\u003e\n\u003cp data-end=\"1492\" data-start=\"1458\" data-section-id=\"ime3gt\"\u003e\u003cstrong\u003e7. Air leaks around compressor\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1512\" data-start=\"1493\"\u003eLeaks may occur at:\u003c\/p\u003e\n\u003cul data-end=\"1586\" data-start=\"1513\"\u003e\n\u003cli data-end=\"1526\" data-start=\"1513\" data-section-id=\"xz4wfj\"\u003eHead gasket\u003c\/li\u003e\n\u003cli data-end=\"1537\" data-start=\"1527\" data-section-id=\"1njq26s\"\u003eFittings\u003c\/li\u003e\n\u003cli data-end=\"1554\" data-start=\"1538\" data-section-id=\"retkg2\"\u003eDischarge line\u003c\/li\u003e\n\u003cli data-end=\"1586\" data-start=\"1555\" data-section-id=\"1prxdpu\"\u003eUnloader\/governor connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1606\" data-start=\"1588\" data-section-id=\"3mg6km\"\u003e\u003cstrong\u003e8. Overheating\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1656\" data-start=\"1607\"\u003eThe compressor may become excessively hot due to:\u003c\/p\u003e\n\u003cul data-end=\"1736\" data-start=\"1657\"\u003e\n\u003cli data-end=\"1675\" data-start=\"1657\" data-section-id=\"165iqxg\"\u003ePoor lubrication\u003c\/li\u003e\n\u003cli data-end=\"1703\" data-start=\"1676\" data-section-id=\"1otc18f\"\u003eRestricted discharge line\u003c\/li\u003e\n\u003cli data-end=\"1720\" data-start=\"1704\" data-section-id=\"t9xjew\"\u003eCarbon buildup\u003c\/li\u003e\n\u003cli data-end=\"1736\" data-start=\"1721\" data-section-id=\"18l05hq\"\u003eInternal wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1771\" data-start=\"1738\" data-section-id=\"1y8dnhw\"\u003e\u003cstrong\u003e9. Smoke from compressor area\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1840\" data-start=\"1772\"\u003eBlue or gray smoke can indicate oil burning or severe internal wear.\u003c\/p\u003e\n\u003cp data-end=\"1875\" data-start=\"1842\" data-section-id=\"1dcq0do\"\u003e\u003cstrong\u003e10. Frequent governor cycling\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1987\" data-start=\"1876\"\u003eIf pressure rapidly drops and rebuilds repeatedly, the compressor may be weak or unable to keep up with demand.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003cbr\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eNavistar®\u003c\/strong\u003e is a proud manufacturer of some of the widely used trucks, yellow school buses, defense vehicles, and engines. It was recognized as the first truck and engine manufacturer to be certified by the EPA for meeting 2007 standards for hydrocarbons and particulate matter. But the company's global portfolio is not limited to its line of vehicles and engines—it also carries high-quality replacement parts and accessories to keep all these working in top condition at all times. From hose fuel, bolts, plugs, rivets, and bearings to flashers, incandescent lamps, camshaft brake, gasket injector, and spring door locks, Navistar has also got you covered.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days warranty\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.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv style=\"position: absolute; left: 198px; top: 358.312px;\" id=\"gtx-trans\"\u003e\n\u003cdiv class=\"gtx-trans-icon\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"International®","offers":[{"title":"Default Title","offer_id":48921841139956,"sku":"K044642","price":1399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/photo_2025-06-20_00-07-33_56eca115-0265-4ce0-b8fa-e8abbf0b1e22.jpg?v=1784940821","url":"https:\/\/firsttruckparts.com\/en-ca\/products\/165-043-0001-genuine-international%c2%ae-air-brake-compressor-ba-921-for-maxxforce-13-11","provider":"First Truck Parts","version":"1.0","type":"link"}