{"product_id":"66868-genuine-bendix®-tractor-protection-valve","title":"66868 | Genuine Bendix® Tractor Protection Valve","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003cbr\u003e\u003c\/strong\u003eA tractor protection valve\u003cstrong\u003e 66868\u003c\/strong\u003e is a safety device used in the air brake system of a tractor-trailer (articulated vehicle). It protects the tractor’s air supply and braking system if there is a problem with the trailer. Tractor Protection Valve For Heavy-duty trucks, Semi-truck tractors and other venicles.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: 66868 \u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003cspan\u003e: New\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eManufacture\/Brand\u003c\/strong\u003e\u003cspan\u003e: Bendix\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e\u003cbr\u003eFits 66868 For \u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e  - Heavy-duty vehicles with air brakes\u003cbr\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e  - Semi-truck tractors (Class 7–8 trucks)\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e  - Sleeper trucks \/ highway tractors\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e  - Day cab trucks\u003cbr\u003e\u003c\/span\u003e  - Dump trucks (with trailer air systems)\u003cbr\u003e  - Fleet and commercial hauling trucks\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cbr\u003ePurpose of using 66868\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e 1. Protects tractor air supply\u003c\/p\u003e\n\u003cul data-start=\"349\" data-end=\"516\"\u003e\n\u003cli data-section-id=\"70vf2\" data-start=\"349\" data-end=\"441\"\u003e\n\u003cp\u003eIf a trailer air line bursts or disconnects, the valve \u003cstrong data-start=\"406\" data-end=\"441\"\u003eautomatically shuts off airflow\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"zloy9z\" data-start=\"442\" data-end=\"516\"\u003e\n\u003cp\u003eThis keeps enough compressed air in the tractor so its brakes still work\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"1shremy\" data-start=\"518\" data-end=\"553\"\u003e2. Prevents total brake failure\u003c\/p\u003e\n\u003cul data-start=\"554\" data-end=\"671\"\u003e\n\u003cli data-section-id=\"8fmpal\" data-start=\"554\" data-end=\"613\"\u003e\n\u003cp\u003eWithout it, air could escape through the trailer system\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"3o0slz\" data-start=\"614\" data-end=\"671\"\u003e\n\u003cp\u003eThat could cause \u003cstrong data-start=\"633\" data-end=\"656\"\u003ecomplete brake loss\u003c\/strong\u003e in the tractor\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"1dhe1fm\" data-start=\"673\" data-end=\"707\"\u003e3. Controls air to the trailer\u003c\/p\u003e\n\u003cul data-start=\"708\" data-end=\"851\"\u003e\n\u003cli data-section-id=\"1d3j1ek\" data-start=\"708\" data-end=\"780\"\u003e\n\u003cp\u003eIt allows air to flow to the trailer \u003cstrong data-start=\"747\" data-end=\"780\"\u003eonly when conditions are safe\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"22i36e\" data-start=\"781\" data-end=\"851\"\u003e\n\u003cp\u003eWorks together with the trailer supply control (red knob in the cab)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"mg24vq\" data-start=\"853\" data-end=\"878\"\u003e4. Emergency response\u003c\/p\u003e\n\u003cul data-start=\"879\" data-end=\"1007\"\u003e\n\u003cli data-section-id=\"1oa4707\" data-start=\"879\" data-end=\"1007\"\u003e\n\u003cp\u003eIf pressure drops below a safe level, it:\u003c\/p\u003e\n\u003cul data-start=\"925\" data-end=\"1007\"\u003e\n\u003cli data-section-id=\"1cmqna5\" data-start=\"925\" data-end=\"952\"\u003e\n\u003cp\u003e\u003cstrong data-start=\"927\" data-end=\"952\"\u003eCloses the air supply\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1xctyr0\" data-start=\"955\" data-end=\"1007\"\u003e\n\u003cp\u003eHelps trigger \u003cstrong data-start=\"971\" data-end=\"1007\"\u003eemergency braking on the trailer\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\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\u003cspan\u003e\u003cstrong\u003e\u003cbr\u003eSigns of a Bad Tractor Protection Valve 66868\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e 1. Constant air leakage\u003c\/p\u003e\n\u003cul data-start=\"237\" data-end=\"414\"\u003e\n\u003cli data-section-id=\"shiuug\" data-start=\"237\" data-end=\"291\"\u003e\n\u003cp\u003eYou hear \u003cstrong data-start=\"248\" data-end=\"291\"\u003ehissing near the valve or trailer lines\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"9fuxiq\" data-start=\"292\" data-end=\"414\"\u003e\n\u003cp\u003eAir pressure drops even when everything is connected properly\u003c\/p\u003e\n\u003cp\u003e-This usually means internal seals are worn or damaged\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"y0b9a4\" data-start=\"421\" data-end=\"459\"\u003e2. Tractor air pressure won’t hold\u003c\/p\u003e\n\u003cul data-start=\"460\" data-end=\"628\"\u003e\n\u003cli data-section-id=\"1fewl8w\" data-start=\"460\" data-end=\"515\"\u003e\n\u003cp\u003eAir pressure in the tractor system \u003cstrong data-start=\"497\" data-end=\"515\"\u003ekeeps dropping\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"p8b4il\" data-start=\"516\" data-end=\"628\"\u003e\n\u003cp\u003eTakes longer than normal to build pressure\u003c\/p\u003e\n\u003cp\u003e-The valve may not be sealing off the trailer circuit correctly\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"owjuzt\" data-start=\"635\" data-end=\"677\"\u003e3. Trailer brakes not working properly\u003c\/p\u003e\n\u003cul data-start=\"678\" data-end=\"817\"\u003e\n\u003cli data-section-id=\"1vk5ov\" data-start=\"678\" data-end=\"817\"\u003e\n\u003cp\u003eTrailer brakes feel:\u003c\/p\u003e\n\u003cul data-start=\"703\" data-end=\"817\"\u003e\n\u003cli data-section-id=\"8s0mfk\" data-start=\"703\" data-end=\"711\"\u003e\n\u003cp\u003eWeak\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"wxe42k\" data-start=\"714\" data-end=\"725\"\u003e\n\u003cp\u003eDelayed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1jnszu5\" data-start=\"728\" data-end=\"817\"\u003e\n\u003cp\u003eNot engaging at all\u003c\/p\u003e\n\u003cp\u003e-The valve might not be allowing proper air flow to the trailer\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"1vd0ski\" data-start=\"824\" data-end=\"878\"\u003e4. Trailer supply (red knob) pops out unexpectedly\u003c\/p\u003e\n\u003cul data-start=\"879\" data-end=\"1033\"\u003e\n\u003cli data-section-id=\"1wx0vfe\" data-start=\"879\" data-end=\"1033\"\u003e\n\u003cp\u003eThe \u003cstrong data-start=\"885\" data-end=\"915\"\u003etrailer air supply control\u003c\/strong\u003e in the cab pops out on its own\u003c\/p\u003e\n\u003cp\u003e-This happens when pressure drops below a safe level—possibly due to valve failure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"dv1oop\" data-start=\"1040\" data-end=\"1074\"\u003e5. No air going to the trailer\u003c\/p\u003e\n\u003cul data-start=\"1075\" data-end=\"1214\"\u003e\n\u003cli data-section-id=\"hrjvnh\" data-start=\"1075\" data-end=\"1128\"\u003e\n\u003cp\u003eAfter connecting, the trailer doesn’t receive air\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"12al2qx\" data-start=\"1129\" data-end=\"1214\"\u003e\n\u003cp\u003eBrakes stay locked or don’t release\u003c\/p\u003e\n\u003cp\u003e-The valve could be stuck closed or blocked\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"1dfxwcc\" data-start=\"1221\" data-end=\"1264\"\u003e6. Valve doesn’t close during a failure\u003c\/p\u003e\n\u003cul data-start=\"1265\" data-end=\"1387\"\u003e\n\u003cli data-section-id=\"14peadf\" data-start=\"1265\" data-end=\"1387\"\u003e\n\u003cp\u003eIn case of a hose break, air continues escaping\u003c\/p\u003e\n\u003cp\u003e-This is dangerous—the valve is supposed to \u003cstrong data-start=\"1363\" data-end=\"1387\"\u003eshut off immediately\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"sl6zhp\" data-start=\"1394\" data-end=\"1425\"\u003e7. Irregular brake behavior\u003c\/p\u003e\n\u003cul data-start=\"1426\" data-end=\"1527\"\u003e\n\u003cli data-section-id=\"ikblex\" data-start=\"1426\" data-end=\"1527\"\u003e\n\u003cp\u003eSudden or uneven braking between tractor and trailer\u003c\/p\u003e\n\u003cp\u003e -Can indicate inconsistent valve operation\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\u003cspan\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"97\" data-end=\"476\"\u003e\u003cstrong data-start=\"97\" data-end=\"151\"\u003eAbout the Manufacturer – Bendix:\u003c\/strong\u003e\u003cbr data-start=\"151\" data-end=\"154\"\u003e\u003c\/p\u003e\n\u003cp data-end=\"400\" data-start=\"96\"\u003e\u003cstrong data-end=\"64\" data-start=\"54\"\u003eBendix\u003c\/strong\u003e is a leading manufacturer of \u003cstrong data-end=\"160\" data-start=\"94\"\u003eair brake systems, safety technologies, and control components\u003c\/strong\u003e for commercial trucks, buses, and trailers. Known for innovations in \u003cstrong data-end=\"274\" data-start=\"230\"\u003ebraking, stability, and traction control\u003c\/strong\u003e, Bendix supplies OEM and aftermarket parts across North America. It is a subsidiary of \u003cstrong data-end=\"378\" data-start=\"362\"\u003eKnorr-Bremse\u003c\/strong\u003e, a global leader in braking systems.\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Bendix","offers":[{"title":"Default Title","offer_id":50725422432503,"sku":"66868","price":459.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/7080\/3959\/files\/802926__0.avif?v=1777416430","url":"https:\/\/forcetruckparts.com\/products\/66868-genuine-bendix%c2%ae-tractor-protection-valve","provider":"Force Truck Parts","version":"1.0","type":"link"}