BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de servicio Pagina 1

Revised 11/15/991OTTAWA TRUCK SERVICE MANUAL AIR BRAKE SYSTEMTABLE OF CONTENTSIntroduction Page 3Typical Air System With ABS Page 4Typical Air System

10Balanced: No. 2 circuit portionWhen the air pressure on the No. 2 side of the relay piston approaches that beingdelivered on the No. 1 side of the r

Stop Light SwitchThe stop light switch (SL5) is an Electro-pneumatic switch and operates in conjunctionwith the brake valve and stoplights by completi

12Double Check and Quick Release Valve (QR-1C)The Double Check and Quick Release Valve (QR-1C) is a dual function valve. Thevalve’s primary function i

Slack Adjusters (automatic)The slack adjuster is the link between the brake chamber and the foundation brakecamshaft. It transforms and multiplies the

14To Park Tractor and Trailer Combination - With both controls pushed in (the normaldriving mode), pulling out the (YELLOW) Parking Brake control appl

While the BP-R1 can incorporate various crack pressures to accommodate specificapplications, the standard is 4 psi.Air connections on the BP-R1 are id

16SERVICE BRAKES RELEASINGTractor/Trailer CombinationWhen the brake application is released, air pressure in the service port of the BP-R1returns to t

LEAKAGE TESTS1. Build the air system pressure to governor cut-out. With the dash-mounted trailersupply valve activated for tractor/trailer operation,

18Antilock Operation—GeneralIf a service brake application is made and the antilock system detects an impendingwheel lockup, the antilock controller w

Antilock Re-ApplyIf the antilock controller senses that wheel speed has increased sufficiently to requirere-application of braking pressure, it de-ene

AIR BRAKE SYSTEM2Revised 11/15/99

20Physical DescriptionThe EC-16 electronics are contained in a die-cast aluminum housing and are environ-mentally protected by a self-healing silicone

An antilock dashlight and its electrical relay are connected to, and controlled by, theEC-16, and serve as a means of advising the driver of the condi

22Antilock Brake ApplicationIf a service brake application is made and the wheel speed sensors detect an impend-ing wheel lockup, the EC-16 controller

When the controller senses an erroneous condition, it stores the condition in memory,disables the antilock or traction function, and illuminates the d

24EC-16 CONFIGURATION DISPLAY1. Turn the ignition ON.2. All LEDs will illuminate, then go out.Air Brake SystemRevised 11/15/99Troubleshooting GuideAir

Air Brake System25Revised 11/15/99Troubleshooting GuideAir Dryer (cont’d)Condition Possible Cause Remedy/RecommendationWater in Vehicle Reservoirs Ben

26Air Brake SystemRevised 11/15/99Troubleshooting GuideAir Dryer (cont’d)Condition Possible Cause Remedy/RecommendationConstant Exhaust Of Air At Air

Air Brake System27Revised 11/15/99Troubleshooting GuideAir Dryer (cont’d)AIR DRYER TESTING1. Set the vehicle parking brake.2. Drain all air reservoirs

28AIR LEAKAGE CHECK1. Set the parking brake.2. Start the engine and charge the air system to the governor cutout point.3. Stop the engine.4. Apply and

12. On vehicles with trailer controls, move the trailer brake hand control handle clock-wise to the full “ON” position.13. Air leakage should be less

3IntroductionThe air system is a vital part of the Ottawa yard tractor. Its proper functioning isnecessary to operate the truck in a safe, dependable

5G-6 AIR BRAKESExternal Conditions That Affect Brake Performance1. Tires—Tires with unequal contact and grip on the road will cause unequal braking.Th

LOW AIR PRESSURE SWITCH1. Set the parking brake.2. Drain all air reservoirs. Refer to “Draining Air Reservoirs.”3. Start the engine and run at a fast

8. Start the engine and charge the air system to the governor cutout point.9. Make sure the SYSTEM PARK control, TRAILER AIR SUPPLY, and TRACTOR PARK

4Revised 11/15/99TRACTOR PROTECTIONVALVE(RED)(BLUE)BOOM5TH WHEELUNLATCHREAR BRAKESRESVFRONT BRAKESRESVPRIMARYRESVOPTIONALAIRDRYERSUPCONDELUNLRESVSTOPL

5Revised 11/15/99SPRINGSERVICESERVICESERVICERESERVOIRSUPPLYRESERVOIROPTIONALAIRDRYERSUPCONDELUNLRESVREVERSELOCKOUTAIRCOMP.5TH WHEELUNLATCHSUPDELDELDEL

6Air Brake SystemComponents • Air compressor• Governor• Air dryer (optional)• ReservoirsPrimaryFrontRearLow pressure indicatorPressure relief valveChe

GovernorThe governor (D2) is mounted on the compressor. It operates in conjunction with thecompressor unloading mechanism and maintains reservoir air

8OPERATION: When air pressure at the supply port and under the diaphragm isabove 70 psi, the electrical contacts remain open because the force exerted

Check ValveThe in-line check valve is a device placed in an air line to allow air flow in one direc-tion only, and to prevent flow of air in the rever