Troubleshooting Brake Systems - LA County Firefighters · March 2003March 2003 Fire Apparatus...
Transcript of Troubleshooting Brake Systems - LA County Firefighters · March 2003March 2003 Fire Apparatus...
Slide 2Slide 2--1212--11March 2003March 2003 Fire Apparatus Driver/Operator 1AFire Apparatus Driver/Operator 1A
Troubleshooting Brake Troubleshooting Brake SystemsSystems
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RepairsRepairs
All repairs to brake All repairs to brake components should be components should be
conducted by aconducted by aqualified technicianqualified technician
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Air Compressor With Air Compressor With GovernorGovernor
Excessive governor cutExcessive governor cut--in/cutin/cut--outoutPossible causePossible cause
Defective compressor and/or governorDefective compressor and/or governor
Possible corrective actionPossible corrective actionContact your department's fleet manager for a Contact your department's fleet manager for a plan of action plan of action
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Air Compressor
Compressor Belt
Pressure Governor
Pressure Switch
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Air Compressor With Air Compressor With GovernorGovernor
Excessive governor cutExcessive governor cut--in/cutin/cut--outoutPossible causePossible cause
Excessive system leakageExcessive system leakage
Possible corrective actionPossible corrective actionHave leak repairedHave leak repaired
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Air Compressor With Air Compressor With GovernorGovernor
Excessive governor cutExcessive governor cut--in/cutin/cut--outoutPossible causePossible cause
Reservoir volume reducedReservoir volume reduced
Possible corrective actionPossible corrective actionDrain water from systemDrain water from system
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Air Compressor With Air Compressor With GovernorGovernor
Excessive governor cutExcessive governor cut--in/cutin/cut--outoutPossible causePossible cause
Brakes out of adjustmentBrakes out of adjustment
Possible corrective actionPossible corrective actionContact your fleet managerContact your fleet manager
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Air Compressor With Air Compressor With GovernorGovernor
Passing excessive oil while draining tanksPassing excessive oil while draining tanksPossible causePossible cause
Poorly filtered airPoorly filtered air
Possible corrective actionPossible corrective actionCheck for defective intake componentsCheck for defective intake components
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Air Compressor With Air Compressor With GovernorGovernor
Passing excessive oil while draining tanksPassing excessive oil while draining tanksPossible causePossible cause
No air dryers in systemNo air dryers in system
Possible corrective actionPossible corrective actionDrain reservoirs dailyDrain reservoirs daily
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Air Compressor With Air Compressor With GovernorGovernor
Slow air buildupSlow air buildupPossible causePossible cause
Poorly filtered airPoorly filtered airExcessive governor cutExcessive governor cut--in/cutin/cut--outoutRestricted air dischargeRestricted air dischargeLoose pulleyLoose pulley
Possible corrective actionPossible corrective actionContact your fleet managerContact your fleet manager
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Air Compressor With Air Compressor With GovernorGovernor
Slow air buildupSlow air buildupPossible causePossible cause
Air dryer purge valve stuck openAir dryer purge valve stuck open
Possible corrective actionPossible corrective actionHave air dryer purge valve repaired Have air dryer purge valve repaired Contact your fleet managerContact your fleet manager
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Air Compressor With Air Compressor With GovernorGovernor
Slow air buildupSlow air buildupPossible causePossible cause
Braided discharge line heat fatiguedBraided discharge line heat fatigued
Possible corrective actionPossible corrective actionCheck using a soap solutionCheck using a soap solution
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General Brake SymptomsGeneral Brake Symptoms
Sensitive brakesSensitive brakesPossible causePossible cause
Brakes improperly adjustedBrakes improperly adjustedDefective or improperly installed componentDefective or improperly installed componentChamber/slack alignment binding Chamber/slack alignment binding momentarilymomentarilyFoot valve/pedal sticking Foot valve/pedal sticking LubricationLubricationInstallationInstallation
Possible corrective actionPossible corrective actionContact your fleet managerContact your fleet manager
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General Brake SymptomsGeneral Brake Symptoms
Brakes will not apply completelyBrakes will not apply completelyPossible causePossible cause
Brakes improperly adjustedBrakes improperly adjustedAutomatic slack adjuster malfunctionAutomatic slack adjuster malfunctionAir line or component freezeAir line or component freeze--upupFaulty brake componentsFaulty brake components\\Foot valve/pedal sticking or movement Foot valve/pedal sticking or movement restrictedrestricted
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General Brake SymptomsGeneral Brake Symptoms
Brakes will not apply completelyBrakes will not apply completelyPossible causes (continued)Possible causes (continued)
Improper chamber/slack adjuster alignmentImproper chamber/slack adjuster alignmentNo air pressure in one brake circuitNo air pressure in one brake circuit
Possible corrective actionPossible corrective actionContact your fleet managerContact your fleet manager
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General Brake SymptomsGeneral Brake Symptoms
Brakes will not release completelyBrakes will not release completelyPossible causePossible cause
Parking brakes on; will not releaseParking brakes on; will not releaseBrakes improperly adjustedBrakes improperly adjustedCondition of brake componentsCondition of brake componentsAir lines pinched, improperly assembled, or Air lines pinched, improperly assembled, or misconnectedmisconnected
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General Brake SymptomsGeneral Brake Symptoms
Brakes will not release completelyBrakes will not release completelyPossible cause (continued)Possible cause (continued)
System contaminationSystem contaminationChamber/slack adjuster bindingChamber/slack adjuster bindingAutomatic slack adjuster malfunctionAutomatic slack adjuster malfunction
Possible corrective actionPossible corrective actionContact your fleet managerContact your fleet manager
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Manual Slack AdjustersManual Slack Adjusters
Adjustment backs offAdjustment backs offPossible causePossible cause
Component malfunctionComponent malfunction
Possible corrective actionPossible corrective actionContact your fleet managerContact your fleet manager
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Locking Ring
Adjustment Nut
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Automatic Slack AdjustersAutomatic Slack Adjusters
Refer to a Certified Refer to a Certified Air Brake TechAir Brake Tech
Automatic Slack Adjuster
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Air System LeaksAir System Leaks
Air leak greater than 2 psi in one minuteAir leak greater than 2 psi in one minutePossible causePossible cause
Air leak when brakes are not appliedAir leak when brakes are not applied
Possible corrective actionPossible corrective actionStarting at the compressor, spray every fitting Starting at the compressor, spray every fitting with soapy waterwith soapy waterContact your fleet managerContact your fleet manager
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Air System LeaksAir System Leaks
Air leak greater than 3 psi in one minuteAir leak greater than 3 psi in one minutePossible causePossible cause
Air leak in system when brakes are appliedAir leak in system when brakes are applied
Possible corrective actionPossible corrective actionSame as with 2 psi air leakSame as with 2 psi air leakHave someone assist youHave someone assist you
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Hydraulic Brake SystemsHydraulic Brake Systems
Brake pedal feels soft and spongyBrake pedal feels soft and spongyPossible causePossible cause
Low amount of fluid in the systemLow amount of fluid in the system
Possible corrective actionPossible corrective actionAdd fluid to the reservoirAdd fluid to the reservoir
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Hydraulic Brake SystemsHydraulic Brake Systems
Brake pedal feels soft and spongyBrake pedal feels soft and spongyPossible causePossible cause
Air in the systemAir in the system
Possible corrective actionPossible corrective actionHave the air removed by a qualified Have the air removed by a qualified techniciantechnician
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Hydraulic Brake SystemsHydraulic Brake Systems
Pedal drifts toward or falls to the Pedal drifts toward or falls to the floorboardfloorboardPossible causePossible cause
Low amount of fluid in the systemLow amount of fluid in the system
Possible corrective actionPossible corrective actionAdd fluid to the reservoirAdd fluid to the reservoir
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Hydraulic Brake SystemsHydraulic Brake Systems
Pedal drifts toward or falls to the Pedal drifts toward or falls to the floorboardfloorboardPossible causePossible cause
Fluid leak in the systemFluid leak in the system
Possible corrective actionPossible corrective actionHave a qualified technician repair or replace Have a qualified technician repair or replace the source of the leak and restore the systemthe source of the leak and restore the system
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Hydraulic Brake SystemsHydraulic Brake Systems
Lack of response of a powered or vacuum Lack of response of a powered or vacuum assisted brake augmentation systemassisted brake augmentation systemPossible causePossible cause
Failure to transfer energy to the brake systemFailure to transfer energy to the brake system
Possible corrective actionPossible corrective actionHave a qualified technician restore the power Have a qualified technician restore the power assist systemassist system
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Secondary Braking SystemsSecondary Braking Systems
Fails to activate as designedFails to activate as designedPossible causePossible cause
System is manually turned offSystem is manually turned off
Possible corrective actionPossible corrective actionEnsure the system is activated and is at the Ensure the system is activated and is at the proper stettingproper stetting
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Secondary Braking SystemsSecondary Braking Systems
Fails to activate as designedFails to activate as designedPossible causePossible cause
System is activated but has failedSystem is activated but has failed
Possible corrective actionPossible corrective actionTake outTake out--ofof--serviceserviceHave a qualified technician repair the systemHave a qualified technician repair the system