0000001837 00000 n | 0000141937 00000 n 1011 Oakmead Drive, Arlington, TX 76011. 0000003322 00000 n Allomatic and SAP Brand Transmission Deep Filter Kit with Spin On for Allison 1000 2000 Years 2001-2009. A BRIEF DESCRIPTION OF THE ALLISON AUTOMATIC Allison automatics described in this manual include a hydraulic torque converter, a planetary gear train, and a hydraulic control system which supplies uid under pressure to apply the clutches and automatically shift ranges. Typical AT, MT, HT Shift Selector Positions. 0000015377 00000 n I called Allison, they said the part number is a standard HT740 4-speed automatic trans. Gear Unit And Main Shaft Assembly HT 750, HT 754CR Parts for Allison HT700: compare prices for Overhaul Kits, Friction Kits, Bushings, Bearing, Solenoid Kits, Valve body, Torque converters, Planetary Gear kits, Filters, Gaskets, Seals, Pressure Plates, Differentials, Sensors, Valves. Planetary Gear 0000143633 00000 n 0000142556 00000 n Differential Transmission Front Cover, Remote-Mount Picture Information. Cross-sections, took off sights, and a hydraulic schematic (transmission in Neutral) are on foldout web pages in the back of the manual. HWr+nv` 4RIQd%GqHXh F1|cnw>TQd=yp\0+x!o>R3TPc2(z2 FPPDx"} LbB~G!xcX@=&!HpNM {8 O[aJ05sUoxppQDBgz7P.WE=H*C'o. 0000136856 00000 n Oshkosh M977, M978, M983, M984, M984A1, M985 0000142778 00000 n 0000138258 00000 n 0000138653 00000 n Banner Kit includes everything in the Overhaul Kit plus fiber clutch frictions. 515104 meets or exceeds OEM requirements and provides consistent, reliable protection as a Transmission Filter for every ALLISON HT740, HT747, HT750, HT754, V730 1975-ON rebuild. | Transfer Gears And Transfer Gear Driven Shaft Contact us: digsvcs@iupui.edu: panel-header. Lockup Clutch And Torque Converter 12,A. . Model: As compared to the electronic variation as well as paper variation, there is a great benefit. 0000141635 00000 n Use the Set Frequency Set by the Operation Panel (Pr. 0000136453 00000 n 15,B. Includes ORing & Pan Gasket. 6 HT 750, HT 754CR Transmission Hydraulic System FREE delivery Apr 12 - 14 . 0000140650 00000 n Detent Cables, Kick Down Cable, Cable Kick Down, Differentials, Differential Carrier, Differential Carriers, Diff, Diff., Diff Housing Carrier, Dipsticks, dip-stick, dip-sticks, Dip Stick, Double Wet Clutch, Dual Dry Clutch, Dual Clutch Wet, Dual Wet Clutch, Dual Clutch, Wet Clutch Kit, Right Axle Seal, Seal Left Axle, Left Axle Seal, Seal Right Axle 133. 0000137497 00000 n A remanufactured Allison HT740 transmission has been renewed by a dedicated transmission repair facility, like Transaxle, that has been authorized by Allison to bring the transmissions to its original standard of quality. 0000141126 00000 n 0000133678 00000 n Allison HT740 Automatic Transmission Filter Kit Allison HT740 Automatic Transmission Oil Filter Kit With For Transmssion with 6 Inch Deep Pan (2001-Up). 0000003256 00000 n 9,B. 0000144575 00000 n All Items. 0000007040 00000 n Format:PDF Valve body 0000142375 00000 n 0000138874 00000 n 0000143206 00000 n 0000139186 00000 n 0000036193 00000 n 0000136754 00000 n 0000141266 00000 n Allison-DB4-HT740-001_page1.tif: Have Questions? Section 6. 0000006305 00000 n REBUILD OF SUBASSEMBLIES. 0000137834 00000 n 0000129393 00000 n | 0000144828 00000 n Allison HT740 Internal Transmission Filter. %PDF-1.6 % 29501160. 10,A. 0000136191 00000 n 170 0 obj<>stream $2,299.99 USD. The newer series 4060/4560 are the newer electronic series. 0000135880 00000 n (0) Write a Review. HT 750DRD(DB), HT 750DRI . Steel Kit . 0000004975 00000 n 0000133816 00000 n Ask one of our experts Answered Questions Question: 6/07/21 0000136274 00000 n 6 ALLISON AT540, 543, 545 0000139418 00000 n | TOOLS & ACCESORIES I think that would be what you need. (815)432-4944 Request Info Enterprise LKQ Geiger Truck Parts Watseka IL. PREVENTIVE MAINTENANCE 0000136034 00000 n 0000141779 00000 n 0000135643 00000 n Section 3. 0000135112 00000 n 0000134650 00000 n 0000138584 00000 n Part Number . OEM #: 73285. 0000004708 00000 n HT 740(D)(RS)(FS) 22,B. ASSEMBLY OF TRANSMISSION. 20,B. Schematic Views HT 747(D) Band 0000134863 00000 n 0000141077 00000 n Allison Transmissions HT740 750 Series - Free download as PDF File (.pdf) or read online for free. The causes of this interest are the needs to extend service brake life and to help meet upgraded European braking standards. Uploaded by bouyer. 0000138301 00000 n 0000139638 00000 n Scavenge Oil Pump And Engine-Driven Power Takeoff, Driven Gear Pictures show proper treatments for all models including models not highlighted. 19,B. 17,A. 0000144082 00000 n Allison Catalog TRANSTAR INDUSTRIES, INC. 7350 Young Dr. Cleveland, OH 44146 (800) 359.3339 2011 A LL I SO N C A T A L O G. 1 . 0000140922 00000 n Toll Free: 1 (800) 881 1843 Fax: 1 (586) 601 1904. The planetary gear design 0000136279 00000 n 17,B. Transmission Housing, Oil Screen, And Six Inch Deep Oil Pan 0000006531 00000 n loads. Hub It could conserve your expenses. | 0000004833 00000 n 0000138831 00000 n 363 0 obj <> endobj xref 363 148 0000000016 00000 n 168 0 obj<> endobj electric modulator is ether n or off only, the 2nd & 3rd clutches burn sower than . $44.99 + $8.65 shipping. HT 700 Hydr Service Manual SM1270 199904 Uploaded by 100003 Description: HT 700 Hydr Service Manual SM1270 199904 Full description 0% Share Download now of 328 Reward Your Curiosity Everything you want to read. Lockup Cutoff, Low Shift, And Low Trimmer Valve Body Assemblies 0000132227 00000 n 0000134066 00000 n 0000141776 00000 n (Used) Allison, TRANSMISSION ASSEMBLY- Model: HT740, Serial Number: 24474, Part Number: 29527199, For more information about this item, give us a call. 0000134256 00000 n Piston Only 20 left in stock - order soon. 0000004787 00000 n Allison mnsmissions automatic models HT 740, HT 747 up to 445 nhp (332 kW HT 740 HT 747 + specifications general rating + Net input power lnput speed, full-load governed Net input torque Vehicle weight 445 nhp (332 kW) (max) 2400 rpm (max) 1900 rpm (min) 1300 lb ft (1763 N.m) (max) Up to 80,000 lbs (36280 kg) GVW and 130,000 lbs (58960 kg) GCW. 0000139681 00000 n | 0000141638 00000 n As for the HT-740 question, the HT-740 stands for 7 Series, with 4 forward gears. Allison Transmission Ht 740 Service Repair Manual. 0000135242 00000 n GENERAL INFO. Topics include Power Take-Off (PTO) operation, shift selectors, prognostics, diagnostics, care and maintenance and even driving tips. 0000142692 00000 n Stratford/Connecticut. 0000143590 00000 n 0000137825 00000 n MK)! 79 = 3) 128. 0000135389 00000 n Solenoid Blocks, sol block, Brass Contact, EPC, Pressure Solenoid, Pressure Control Solenoid, Pressure Solenoid, PWM solenoid, Pressure Regulator Solenoid, Solenoid package, solenoids, Solenoid Retainer, Solenoid Kit, pack, Solenoid Upgrade Kit, Solenoid Set, Shift Solenoid Upgrade Kit, Shift Solenoid Kit Set, Speed Sensors, Output Sensor, Input sensor, Reluctor, Shaft Sensor, Speed Sender, Sensor Input, Sensor Output, Sensor Input / Output, TURBINE SPEED, INPUT SPEED, VEHICLE SPEED, spragg, Sprags, Mechanical Diode, Sprag Assembly, Sprag Cartridge, One Way Clutches, One Way Clutch, Roller Clutches, Roller Clutch, Low/Rev Diode, Retaining Plates, Retaining Plate, Accordion Spring, OWC, Springs, Wave Spring, Spring Adjuster, Spring Disc, Torsion Spring, Return Spring, Piston Spring, Damper Spring, Damper Springs, Control Spring, Detent Spring, Drum Spring, Limit Spring, Return Sprng, Diaphragm Springs, Diaphragm Spring, Steel Kits, Steel Set Kit, Steel Clutch Plate Kit, Steel kit, clutch steel, clutch steels, Steel set, steel pack, module kit, Steel Plate Clutch Kit, Steel Plate Kit, Steel Plate Module, Steel Plate Set, Steel Module, Stepper motors, steppen, Step Motor, Ratio Control Motor, Sun Gears, Sungear, Sungears, Sun Gear Retaining Ring, Final Drives, Final Drive, FinalDrive, SUN, Supports, Centre Supp Rebuilt, central support. | Allison Transmission HT 740 (D)( RS) (FS) Automatic Models Solution Repair Work Manufacturing Facility Handbook is a digital variation of the very best original upkeep guidebook. 0000136617 00000 n 0000004742 00000 n 0000136936 00000 n 9,A. Section 4. 0000113434 00000 n 22G532. 0000009219 00000 n c3d3a(26NKZ BCQT6(FAT!p4t@>zi 6 [ d(x!a F7F8\^0e0(aK0NfXa5*F)?H3@ ' Cross-sections show the partnership of assembled parts. . 0000135533 00000 n REBUILD OF SUBASSEMBLIES HT 754CR(RS), HT 754CRD Worldwide Shipping, Overhaul kit include paper, rubber, gaskets, o rings, lip seals, metal clad seals and sealing ring kit (6885217). However if that were the case, you would be shifting 2-3 and 3-4 in forward with no first gear when in drive. ALLISON HT740, HT747, HT750, HT754, V730 Transmission Nitrile Pan Gasket 21 Pan Bolts. 0000134985 00000 n 0000002339 00000 n Pressure Plate 23,A. 0000141438 00000 n 0000134757 00000 n 0000142096 00000 n Pages:328 11. If you didn't have fourth, and had no reverse, the 3-4 signal valves or the relay valve could be sticking in the de-stroked position. 12,B. Master Kit includes everything in the Banner Kit plus steels. Every Allison HT740 transmission is remanufactured to factory standards. Trucks 0000144313 00000 n 0000144489 00000 n 0000137312 00000 n GENERAL OVERHAUL INFORMATION Currently available for Allison AT545, MT643, MT653DR, MT654CR, HT740, HT750CR, HT750DR, HT754CR. Section 5. Type of document: Service Manual Contact the seller. 1 (current) Search this record. Refer to the following . 0000138728 00000 n 0000139184 00000 n 0000143846 00000 n DESCRIPTION AND ALSO PROCEDURE. Torque converter 0000135028 00000 n The throttle position sensor, speed sensor, and range selector transmit information to the ECU. 0000135648 00000 n Worth, TX 800-527-4821 Denver, CO 800-525-9096 Detroit, MI 0000140560 00000 n heavy trucks together with AT and MT families. 0000141309 00000 n 0000137979 00000 n 0000138976 00000 n 14,A. Allison Transmissions HT740 750 Series. 0000138022 00000 n Allison HT740 Automatic Transmission Oil Filter Kit With For Transmssion with 6 Inch Deep Pan (2001-Up). As compared to the electronic variation as well as paper variation, there is a great benefit. 0000051463 00000 n 0000135088 00000 n 0000014996 00000 n ASSEMBLY OF TRANSMISSION 0000021569 00000 n 0000097541 00000 n 0000137727 00000 n 0000137474 00000 n 0000138933 00000 n Allison Transmission Ht 740 (d)(rs) (fs) Service Manual This manual contains services repair work treatments for the Allison Transmission HT 740 (D)( RS) (FS) Automatic Models. Users are guaranteed to find each printed manual's latest revision within . Home Partmanual Truck & Bus Allison Transmission HT 740-754 Hydraulic Service Manual_SM1270EN, Size : 11.2 MB Q 0000136555 00000 n HT 747(D) 0000132971 00000 n Allison Ht740 Service Manual - Allison Ht740 Service Manual Allison Ht740 Transmission Service Manual Pdf document video glencoe dna how are solutions prepared in laboratories bussiness economics Allison Transmission - Wikipedia, the free encyclopedia - Allison Transmission is an American manufacturer of commercial . !I^95'0$9.0]b% MrrX 4C\AZ&nQ0OSAsfClV0Mg$E2zVz].pu0I%(74c*G, R#6jb,nxzCT%. PREVENTIVE UPKEEP. 19,A. 18. startxref | Range Selection - HT 750DR, HT 750DR DB. endstream endobj 169 0 obj<> endobj 171 0 obj<> endobj 172 0 obj<>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC]/ExtGState<>>> endobj 173 0 obj<> endobj 174 0 obj<> endobj 175 0 obj<> endobj 176 0 obj<> endobj 177 0 obj[/ICCBased 190 0 R] endobj 178 0 obj[/Separation/All 177 0 R 191 0 R] endobj 179 0 obj<>stream Sensor, No items found matching the search criteria. BASIC OVERHAUL INFO. 15,A. 0000051871 00000 n HT 754CR(RS), HT 754CRD 0000140029 00000 n 0000138160 00000 n 0000097681 00000 n 0000143488 00000 n Give Allison a call on Monday-- will sure help if you have the model and serial number handy: Allison help line 800 252 5283. Seal ensures smooth gear shifting without any interruptions in power delivery. 3 HT 750DR Transmission 0000004839 00000 n 100% Allison OEM parts All new electronics Allison Transmission Ht 740 Service Repair Manual, Cat | Volvo | Caterpillar - Excavator Brands Service Manual 2023, Allison Transmission Md 3066 Service Repair Manual, Allison Transmission 3500 Sp Service Repair Manual. | It is very popular in busses, motor homes, garbage trucks and other heavy vehicles. Reverse pressure goes underneath the 1-2 relay. | HT740. Oil Pump And Converter Housing For Models Without Input Retarder Or Engine-Driven PTO) 0000006125 00000 n 0000136163 00000 n 0000140965 00000 n Front Support And Main Regulator Valve Assembly 0000066457 00000 n 0000136316 00000 n Save $2 when you order online with coupon code: ONLINE2 | 0000138438 00000 n 0000135347 00000 n With this factory service repair manual on hand can easily help you can serve and troubleshoot Heavy Equipment, to resolve any problems that arise. 0000129046 00000 n support central, Manifolds, Switch Manifold, Switch Manifolds, Pressure Switch Manifold, Pressure Switch Manifolds, Switch, Manifold, Temperature Sensors, Oil Temp. equipped with this transmission can speed up much faster than trucks with Allison Transmission HT 740 (D)( RS) (FS) Automatic Versions Service Repair Service Factory Handbook is an ideal manual, which has a lot of information. It came with a V6 gas engine which was way under powered for my needs. Transmission kits come complete with shift arm, transmission mounting bracket, cable hanger and required hardware. 0000140233 00000 n Shaft seal, Seal Drive Shaft, Seal MC Drive Shaft, Seal MC Drive, Axle Seal Left, seal axle, Seal Drive Shaft, Seal 4WD Left Axle, Axle Seal, Flexplates, Flex plate, Driveplate, Drive plate, D/Plate, Flexplate, Drums, Contender Drum, Drum with Bearing, Reverse Drum, Drum Part, TCMs, transmission control module, TCU, TCM, Computer, Circuit Board, Control Module, Control Unit, Hardware, Electrics, Electric, Electronic, Electronic Shift, Electronics, Pin Wiring, Relay Control Switch, Neutral Relay, Main Relay, End Plugs, Tail Plug, Tail Plugs, Tailplug, Tailplugs, Extn Hsg, Extn.Hsg, Extensions, Extension, Overdrive Housing, TAIL HOUSING, TAIL EXTENSION, Filters, Filter Cartridges, Filter Cartridge, Oil Pan Filter, Inlet, Filter Kit, Flanges, Drum Flanges, Drum Flange, Flange Yokes, Flange Yoke, Flange Kit, Rear Flange Kit, Yoke, Slip Yoke, Yokes, Flange, Flywheel Shim, Dual Mass Fly Wheel, Fly Wheel, Dual Mass Flywheel, Friction Discs, Frictions, fric, Friction Disc, Friction, Friction Plate, Friction Ring, fric., Clutch Plate, Friction Lining, Friction kits, friction pack, friction set, High Energy Clutch Friction Module, Friction clutch, Gaskets, gsk, gskt, , Cover Gasket, Cover Gaskets, Case Gasket, Case Gaskets, Filter Gasket,Filter Gaskets, Gasket Pan, Pan Gaskets, Pan gasket, Filter Gasket,Filter Gaskets, loom, Harnesses, Line Connector, Wiring, Cover Wiring, Cable, Signal Cable, Cable, Power Cord, Inhibitor switches, Inhib.Swtch, Range Selector Switch, Selector, Range Switch, Position Switch, Gear Selector, ISM, Input Shafts, Shaft input, Shaft Input/Main, Inputshaft, manuals, Technical manual, Repair manual, service manual, Manual, VIDEO & AUDIO, tapes, Lever, Levers, Lever Control Rod, Knob, Lever Pin, Lever Collar, SHIFT LINKAGE, Linkage Rod, Linkage, Park Pawl, Rod, Main Shafts, Mainshaft, Mainshafts, SHAFT MAIN, Modulators, Reverse Modulator, Vacuum modulator, Mounting Pad, Mounting Ring, Transmission Mount, Transmission Mounts, Mounting Rings, Mounting Pads, Nuts, Hex Nut, Hex Nuts, adjustment nut, band adjustment, o-ring, o ring, 0ring, 0-ring, 0 ring, ORing, Ring, O-Rings, o-ring, O'Ring, Output Shafts, Carrier Output Shaft, SHAFT OUTPUT, ohk, OHK kit, Overhauls, mok, Overhaul kit, Masterkit, Master kit, Master Overhaul, Repair package, Overhaul, Rebuild kit, Master Rebuild, Super Rebuild Bundle, Banner Kit, SUPER KIT, SUPERIOR KIT, Piston Pins, Servo Pin, Piston Pin, Band Pin, Retaining Pin, Retaining Pins. | 0000128774 00000 n To satisfy this demand, Detroit Diesel Allison has developed an integral output retarder . 168 35 Both types have the same part number 23014539. allison ht740 shift solenoids - Engine and Transmission - BigMackTrucks.com All Activity Home Specific Topic Forums for Antique & Modern Trucks Engine and Transmission allison ht740 shift solenoids allison ht740 shift solenoids By macattack February 14, 2017 in Engine and Transmission Share Followers 0 Reply to this topic Start new topic macattack REBUILD OF SUBASSEMBLIES. I believe the shift points in both transmissions are adjustable, to a point at least. 0000008212 00000 n 0000137454 00000 n 7 HT 750DR Transmission Hydraulic System No Lockup In First Range All Items. 0000139141 00000 n 0000133464 00000 n 0000136121 00000 n burn up from modulator causes 2nd 3rd & 4th gear clutch packs to burn up . Type of machine: Transmission Remanufactured Allison HT740 for sale and ready to ship nationwide. Solenoid TCC 0000140565 00000 n 0000141169 00000 n 0000129851 00000 n manuals or AMTs. OFF HIGHWAY TRANSMISSIONS: CLT754: Allison Transmission It could focus anywhere on your computer, so you can see it clearly. 0000140091 00000 n 0000137016 00000 n 0000143769 00000 n item 7 Allison HT740 Transmission Allison HT740 Transmission . 0000141120 00000 n 0000141481 00000 n 0000139332 00000 n 0000139057 00000 n xb```f````e``fd@ A&FH epk2'O}9b38Lbz7al|6Mem6"Tf?q LV/;yR^~-/ynyz. Ht6$k"BYStja> w_O'! E2WxGQm^V1&5e>HZSTXPBGq_V!.G-%W8gb4hixrDe(RHz f(w 2pF hCVS6gDW@d;L;;v >5K'j)5^Ag0D/$CL=| B0::@"::: `PR2 BASIC OVERHAUL INFO. Third Clutch, Center Support, And Second Clutch | 0000001753 00000 n 0000136471 00000 n Order Online; Support Core Returns Documents & Media Road Speed Calculator Weller Reman Bundle Program Support Videos Download our Mobile App! Circlips, Clip, Detent Cable Clip, Line Clip, Linkage Clip, Retainer Clip, Snap Ring, Snap Rings, Retaining Ring, Cover Retaining Ring, Retaining Ring, Circlip Kit, Kit Circlips, Kit Snap Ring, Kit Snap Ring, Coolers, Oil Cooler, Heat Exchange, Heat Exchanger. gP+e`C( 0000136899 00000 n Allison Transmissions AT540, 543, 545 21 Bolt Pan REBUILDER KITS Rear Wheel Drive (1) Contains front pump gasket, rubber lathe-cut seal, o-ring and pump bolt washers. Input Carriers, Input Carrier, Carrier Assy, CARRIER-CR, CARRIER-MD, Check Balls, Checkball, Checkballs, Balls, ball. 0000133870 00000 n 0000019784 00000 n +Bold figure number help you quickly match illustrations with instructions. $41.84. If you are currently working on an Allison transmission and need more information check out our selection of factory printed Allison manuals: Allison Service Manuals Allison Parts Manuals Allison Troubleshooting Manuals page2. Allison Transmission Ht 740 Service Repair Manual Free shipping by email Price: $29.99 Allison Transmission Ht 740 Service Repair Manual Table of includes: GENERAL INFO. Covers fault codes for Allison 1000 and 2000 series transmissions. Range Selection - at 500 Series and at 1500 Series with a Second Neutral (Park) 12. The truck was geared for the 3400 rpm gas engine and would do 55 on the flat. and operational characteristics at road speeds. . There was a maximum rpm difference of 800 rpm (slower) with the Cummins engine. 0000138117 00000 n surface. 0000144270 00000 n 0000134424 00000 n 1843 Tucker Street, Rock Hill, SC 29730. Engine : Eight cylinder DDC 8V-71 two-cycle diesel developing 285 HP at 2150 RPM. 0000143346 00000 n 0000140980 00000 n Bearing 0000133328 00000 n 0000137517 00000 n We ship Worldwide! 0000129412 00000 n 0000134337 00000 n For the HT, Allison engineers 0000142907 00000 n First or Low Piston, Rear Cover, Output Shaft, And Governor 0000112982 00000 n 0000144403 00000 n As the world leader in fully automatic transmissions, Allison Transmission offers our customers a global network of trained technicians at our Allison Authorized Distributors and Dealers to service and care for your Allison transmission. Overhaul procedures are illustrated by sketch. | 0000133595 00000 n OE No. | 0000133668 00000 n The text is supported by line drawings and also cross-sectional views. 0000132943 00000 n 0000142513 00000 n 0000135728 00000 n 0000001970 00000 n BASIC OVERHAUL INFO. 0000138035 00000 n technicians follow factory training procedures and use 100% Allison OEM parts in our remanufactured found the way to combine the effectiveness of companys smaller gearboxes with Rebuilt Allison HT740D Transmission For Hemtt Vehicles. 20,A. 0000135491 00000 n 0000135360 00000 n 0000143048 00000 n the enhanced reliability of recognized Allison solutions. 0000137269 00000 n 0000143445 00000 n 0000006617 00000 n Part Info. 0000136893 00000 n Allison said they do not make a 740D, they make a 750DR which is a 5-speed with the first gear being . | 0000137045 00000 n 0000140210 00000 n Manuals Powertrain Parts Radio Parts Tires, Wheels and Accessories 9.00 x 20 NDT Commercial Tires Specialty Tires Super Singles Military Tread HMMWV Tires Wheel / Rim Accessory 12 x 20. . 0000134299 00000 n 16. Part No. 0000137743 00000 n Bushing Gear Unit And Main Shaft Assembly HT 740, HT 747 Friction Kit 0000139364 00000 n 0000133445 00000 n 0000141352 00000 n 0000133180 00000 n 0000144699 00000 n 0000144742 00000 n Free shipping. Allison Transmission HT 740 (D)( RS) (FS) Automatic Models Service Repair service Handbook is written detailed thoroughly, so you come to be very simple to repair by yourself. USE LIMITATIONS As Well As SPRING INFORMATION. | 0000137614 00000 n Model: Core $755.00. | Worldwide interest in secondary braking systems on buses and trucks is increasing.