GROUP 2 (AB)

PERFORMANCE CONDITIONS — AIR BRAKE — AIR SUPPLY SYSTEM — TRUCKS ONLY
OIL OR WATER IN BRAKE SYSTEM
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Most Probable CauseAction IndicatedReference For
Appropriate
Shop Manual
If Defective
1.Failure to drain reservoirs at regular interval.Check with owner to determine maintenance practices.Maintenance ManualAdvise owner of correct drain interval.
IF OK:
2.Dirty compressor air filter.Check condition of air filter.Group 2, Part 2Clean compressor air filter.
IF OK:
3.Worn compressor piston rings.Check for excessive oil or water in the air brake system.Group 2, Part 1Replace compressor.
IF OK:
4.Bent or restricted compressor oil drain line.Check condition of return line.Group 2, Part 1Replace return line.

GROUP 2 (AC)

PERFORMANCE CONDITIONS — AIR BRAKE — AIR SUPPLY SYSTEM -- TRUCKS ONLY
CONTINUOUS OR INTERMITTENT COMPRESSOR KNOCKS
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Most Probable CauseAction IndicatedReference For
Appropriate
Shop Manual
If Defective
1.Loose drive pulley.Check drive pulley for looseness or damage.Group 2, Part 2Tighten pulley. Replace pulley if damaged.
IF OK:
2.Worn or burned out compressor bearings.Perform "Preliminary Brake System Test — All Vehicles With Air Brake System". Check for compressor malfunction.Group 2, Part 2Replace compressor.
IF OK:
3.Excessive carbon deposits in the compressor cylinder head.Perform Preliminary Brake Test All Vehicles With Air Brakes.Group 2, Part 2Replace compressor.

GROUP 2 (AD)

PERFORMANCE CONDITIONS — AIR BRAKE — AIR SUPPLY SYSTEM — TRUCKS ONLY
AIR PRESSURE BELOW NORMAL
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Most Probable CauseAction IndicatedReference For
Appropriate
Shop Manual
If Defective
1.Low engine idle speed.Check engine idle rpm.Group 10, Part 1Adjust engine idle rpm to specification.
IF OK:
2.Slipping compressor drive belt.Check the drive belt for slipping or excessive looseness.Group 2, Part 2Adjust drive belt to specification.
IF OK:
3.Defective air gauge.Check dash panel pressure gauge with a test gauge.Group 2, Part 2Replace gauge.
IF OK:
4.Open reservoir drain cock.Check position of drain cock to see if it is open.Group 2, Part 2Close drain cock.
IF OK:
5.Defective compressor.Perform "Preliminary Brake System Test - All Vehicles With Air Brakes" Check for compressor malfunctioning.Group 2, Part 2Replace compressor.
IF OK:
6.Air leaks.Check all lines, hoses and connections for leaks. Also all valves, governor and compressor for air leaks.Group 2, Part 2Replace all worn or damaged parts or components.
IF OK:
7.Defective safety valve.Check pressure gauge on dash panel to see at what pressure safety valve blows. Pressure should be relieved at 150 psi.Group 2, Part 2Replace valve.
IF OK:
8.Ruptured brake chamber diaphragm or broken brake chamber return spring.Disassemble brake chamber and check for damaged diaphragm or return spring.Group 2, Part 2Replace broken or worn parts.
IF OK:
9.Treadle or hand controlled linkage improperly adjusted.Check treadle linkage for improper adjustment or missing spacer. Also, check hand controlled linkage.Group 2, Part 2Adjust linkage to specification. Repair or replace worn or damaged parts.
IF OK:
10.Clogged compressor air filter.Check condition of compressor air filter.Group 2, Part 2Clean Air Filter.
IF OK:
11.Clogged governor air filter(s).Check both governor air filters for clogging.Group 2, Part 2Clean air filter(s).

GROUP 2 (AE)

PERFORMANCE CONDITIONS — AIR BRAKE — AIR SUPPLY SYSTEM — TRUCKS ONLY
AIR PRESSURE RISES ABOVE NORMALL
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Most Probable CauseAction IndicatedReference For
Appropriate
Shop Manual
If Defective
1.Defective air gauge.Check operation of dash panel gauge with a test gauge.Group 2, Part 2Replace gauge.
IF OK:
2.Defective or improperly adjusted governor.Start engine and build up pressure in system. Governor should cut-in between 98-104 psi and should cut-out between 118-125 psi. Check to see if governor cut-in and cut-out points can be adjusted by turning the adjusting screw.Group 2, Part 2Adjust the governor to the correct cut-in and cut-out points by turning the adjusting screw. If governor cannot be adjusted, replace it.
IF OK:
3.Restricted line between governor and compressor unloading mechanism.Remove line and check for obstruction.Group 2, Part 2Remove obstruction. Replace line if damaged or worn.
IF OK:
4.Defective compressor.Perform "Preliminary Brake System Tests — All Vehicles With Air Brakes". Check for compressor malfunction.Group 2, Part 2Replace compressor.
5.Defective safety valve.Check pressure gauge on dash panel to see at what pressure safety valve blows. Pressure should be relieved at 150 psi.Group 2, Part 2Replace safety valve.
IF OK:
6.Manual emergency valve, tractor protection valve, or relay emergency valve in towing vehicle is in emergency position (if trouble is in trailer brakes only).Check setting of valves.Group 2Set valves properly.

GROUP 2 (AF)

PERFORMANCE CONDITIONS — AIR BRAKE — AIR SUPPLY SYSTEM — TRUCKS ONLY
SAFETY VALVE BL0WS-0FF
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Most Probable CauseAction IndicatedReference For
Appropriate
Shop Manual
If Defective
1.Defective safety valve.Check pressure gauge on dash panel to see at what pressure safety valve blows. Pressure should be relieved at 150 psi.Group 2, Part 2Replace valve.
IF OK:
2.Governor (cutout) setting too high.Check accuracy of dash panel pressure gauge with a test gauge. Start engine and allow pressure to build up. Governor should cut-out 125 psi.Group 2, Part 2Adjust governor.

GROUP 2 (AG)

PERFORMANCE CONDITIONS — AIR BRAKE — AIR SUPPLY SYSTEM — TRUCKS ONLY
QUICK AIR PRESSURE DROP WITH ENGINE STOPPED
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Most Probable CauseAction IndicatedReference For
Appropriate
Shop Manual
If Defective
1.Air leaks.BRAKES RELEASED
Check all air lines and hoses for leaks. Check foot control valve, governor, compressor discharge valve, reservoir, and all other system valves for leakage. Also refer to "Air Pressure Below Normal" section of this manual.
Group 2, Part 2Replace all worn or damaged lines or hoses. Also replace all leaking valves. If problem involves compressor, replace compressor.
1.Leakage in brake chambers, brake chamber diaphragms, tube and hose connections.BRAKES APPLIED
Check brake chambers and chamber diaphragms for leaks. Check all lines and hoses and connections. Also refer to "Air Pressure Below Normal" section of this manual.
Group 2, Part 2Replace defective brake chambers. Replace all worn or damaged hoses or lines.

GROUP 2 (AH)

PERFORMANCE CONDITIONS — AIR BRAKE — AIR SUPPLY SYSTEM — TRUCKS ONLY
BRAKES RELEASE TOO SLOWLY OR WILL NOT RELEASE
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Most Probable CauseAction IndicatedReference For
Appropriate
Shop Manual
If Defective
1.Restricted exhaust ports or weak return spring in foot control valve.Check operation of foot control valve. Check exhaust port for obstruction.Group 2, Part 2Clean exhaust ports. Replace worn or damaged parts.
IF OK:
2.Restricted or damaged air lines or hoses.Check all lines and hoses for obstructions or damage.Group 2, Part 2Remove all obstructions. Replace all worn or damaged hoses or lines.
IF OK:
3.Defective or restricted quick-release valve.Check exhaust port or quick-release valve. Then disassemble the valve and check diaphragm and spring for damage or wear.Group 2, Part 2Clean exhaust port. Replace all worn or damaged parts.

GROUP 2 (AI)

PERFORMANCE CONDITIONS — AIR BRAKE — AIR SUPPLY SYSTEM — TRUCKS ONLY
LOW PRESSURE INDICATOR VALVE DOES NOT OPERATE
READ MORE:
Most Probable CauseAction IndicatedReference For
Appropriate
Shop Manual
If Defective
1.Electrical connections are loose, grounded or shorted.Check wiring on low pressure indicator. Check for broken or bare wires. Also, check connection at the valve.Group 2, Part 2Replace damaged or worn wires
IF OK:
2.Defective indicator valve.Start engine and build up system pressure. Exhaust pressure slowly. Warning buzzer should sound at 60 psi.Group 2, Part 2Replace valve.

ADDITIONAL INFORMATION

The following TSB articles contain additional information which will be of value to the diagnostician. It is suggested that Service Personnel who do diagnosis work familiarize themselves with the contents of these articles.

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TSB NumberDateTSB Article No.SubjectModels Affected
61/18/65105Disc Brake Creep — Groan NoiseAll 1965 Thunderbird and Mustangs equipped with Disc Brakes
12/21/6483New Synchro-ValveAll 1964-65 Trucks with Tractor Trailer Air Brake Package and Maxi or Stop-Master Air Parking Brake Systems
71/25/65113Master Cylinder Brake Tube Interference1965 F-100/250 Trucks
82/1/65134Obtaining a Firm Brake Pedal After Servicing Vehicles with Disc BrakesAll Vehicles With Disc Brakes
102/22/65179Disc Brake Rotor Hub Bolt ReplacementAll 1965 Thunderbird and Mustangs With Disc Brakes
155/10/65292Intermittant Loss of Brake Pressure963-64 F, B, and N-Series Trucks With Dash Mounted Boosters
166/1/65311Front Wheel Bearing End Play Adjustment On Vehicles With Disc BrakesAll Vehicles With Disc Brakes
166/1/65313Power Brake Clunk Noise During Normal to Quick Brake ApplicationAll 1965 Fords With Power Brakes
166/1/65317Road Splash Entering Engine Compartment Causing Power Brake Booster Pivot Pin To Rust, Bind, Poor Modulation, and/or Not Permit the Brake Pedal to Return to the Full Released Position1965 Ford — All Models with Power Brakes
176/14/65346Brake Adjustment Procedure With New Metal Knock Out Plugs In Brake Backing PlateAll 1965 Model Vehicles Except Thunderbird
187/2/65346Brake Adjustment — Revised ProceduresAll Current Ford Cars and Light Trucks
187/2/65350Rear Brake Drag and/or Early Lining WearAll 1965 Fords
187/2/65354Brake Swerve, Pull or Fade1965 F-250 Trucks
187/2/65355Rear Brake Carrier Plate Attaching Bolt Failure (Hydraulic Brakes)Truck Models F, B, C, N, P-500-700 and T-700 With Hydraulic Brakes
197/26/65362Road Splash Entering Engine Compartment Causing Brake Booster Pivot Pin To Rust, Bind, Poor Modulation and/or Not Permitting the Brake Pedal To Return To The Full Released Position1965 Ford — All Models With Power Brakes
197/26/65365Servicing The Brake Booster Assembly Less Master Cylinder on Disc Brake VehiclesAll 1965 Thunderbirds
197/26/65373Incorrect Brake Shoe and Lining Assemblies In Brake Lining Service Kits1965 Ford Station Wagons
208/20/65383Conversion of Automatic Adjusting Brakes to Manual Adjusting Brakes1965 Ford Police Vehicles Only
208/20/65395Air Compressor To Governor Tube Failure1963-65 N-H-1000-D and NT-850-950-D
229/17/65423Brake Pull1965 F-100 Trucks Except 4x4
2310/28/65438Disc Brake Torque Revision — 1966 Ford-Mercury Shop Manual1966 Ford and Mercury With Disc Brakes
2310/28/65446Part Number and Nomenclature Correction — 1966 Ford-Mercury Shop Manual1966 Ford and Mercury With Disc Brakes
2510/29/65485Overheating or Dragging Brakes1963-66 F, N and B-500-700 Trucks With Cowl Mounted Brake Boosters
2712/10/65543Parking Brake Lever1965 B-Series and F-500-750 Model 84 — Chassis Cowl
2812/13/65563Engine Noise, Cold Air and/or Engine Odors Entering the Passenger CompartmentAll 1966 Ford Vehicles With Power Brakes
291/14/66575Disc Brake Rotor ResurfacingFord, Mercury, Mustang Thunderbird, Lincoln
291/14/665831966 Ford-Mercury Disc Brake TorqueFord and Mercury Cars With RPO Disc Brakes
301/28/66603Brake Drag1965-66 F-100/250 Trucks With RPO or Service Installed Dash Mounted Booster
322/25/66640Parking Brake Cable Failures1964-66 F-100/250 Trucks and 1964-65 4x4
335/11/66678Loss of Power Assist on Power Brake VehiclesAll 1966 Thunderbird Models, All 1966 Falcon and Fairlane Models With Power Brakes and All 1966 Fords, Except Station Wagon Models With Power Drum Brakes
343/25/66686High Temperature Brake Fluid and EPT Seal UsageAll 1965 Thunderbirds
343/25/66688Parking Brake Retracting Spring1965 F-100/250 Trucks Including 4x4
354/1/66720Front Brake Contamination1963-65 F, B, N-500/750 and N6000/7000 With Cast Spoke Wheels and 5000 or 5500 Pound Front Axles
364/8/66734Service Refinishing of Disc Brake RotorsFord, Mercury, Mustang, Thunderbird, Lincoln
364/8/66740Brake Fluid Leakage at The Master Cylinder Reservoir Cover1963-66 F-600/700 and N-600/ 700 With Cowl Mounted Brake Booster
374/22/66749Front Disc Brake Caliper to Spindle Attaching BoltAll 1965 and 1966 Thunderbirds
374/22/66750Maxi-brake RepairsHeavy Trucks Equipped With Maxi-brake Air Parking Brake
374/22/66751Front Brake Hose Retaining Strap BreakageAll 1966 Fords With Disc Brakes Only
374/22/66754Disc Brake Master Cylinder Reservoir Cover Seal DiaphragmAll Vehicles With Disc Brakes — Thunderbird, Ford, Mustang
385/6/66773Premature Rear Brake Drum WearAll 1965-66 Heavy and Extra Heavy Trucks With 16 1/2" x 6" and 16 1/2" x 7" "S" Cam Air Brakes
385/6/66776Addition To Article No. 620 Dealer Replacement of Front Hub and Drum Assemblies1966 Falcon Ranchero, Falcon 8-Cylinder Station Wagon and 289 CID 8-Cylinder Engines in Fairlane Station Wagon
385/6/66777Rear Brake Shoe Retaining Spring FailureAll Trucks With "S" Cam Operated Eaton Design Air Brakes
417/1/66820New Master Cylinder1963-66 F-B and N-500-700 and F-350 With Cowl Mounted Brake Booster
427/15/66847New Rear Brake Drum1966 T-950 With 50,000-60,000 Pound Rockwell Tandem Axles, F-950 With 29,000 Pound Rockwell Rear Axle and 16-1/2" x 7" Rear Brakes
427/15/66857Brake SquealAll Medium and Heavy Trucks With 16" x 2 1/2" Front and 16 1/2" x 4 1/2" Rear "S" Cam Operated Air Brakes
459/2/66890Improved Brake Treadle Position1965-66 B-600-750 and F-600 750 (Model 84) With Air Brakes
459/2/66905Air Brake Reservoir Check Valve LeaksAll Trucks With Air Brakes
459/2/66906Brake SquealAll Medium Trucks With 16" x 2 1/2" Front and 16 1/2" x 4 1/2" Rear "S" Cam Operated Brakes

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