User's Manual

ManualsBrandsBENDIX ManualsABS SystemBENDIX BW2676

External Vehicle Walkaround Air Brake System Inspection

Date: Invoice Number: Customer Name:

Completed By:

Brake Requires Needs

System Repair or Further

Component Check For: OK Adjustment Diagnosis Quoted Symptom Notes/Clariﬁ cation/Impact

Compressor

Broken, Cracked, or Loose Replace

Mounting Flange

Oil Leaks Exterior leaks at the gaskets. Exterior leaks at the gaskets are a sign of loose or broken parts.

(See Symptom 2.0) Excessive oil at the head gasket can indicate over pressurized

condition.

Discoloration Compressor Head Discoloration or Rust Discoloration or rust can be an indication that the compressor is

(See Symptom 4.0 items e, f, g & h) running hot. High operating temperatures will cause excessive

oil carry over and will shorten the life of the compressor.

Condition of Inlet Line. A broken, bent, kinked, or restricted Inlet Line, or a A restricted inlet will cause slow pressure build and oil to pass

Engine Air Filter. poorly maintained inlet air ﬁ lter or engine air ﬁ lter. into the air system. An inlet open to atmosphere and/or a poorly

(See Symptom 9.0 items f & g) maintained engine air ﬁ lter will allow dirt to enter the compressor.

Compressor life will be signiﬁ cantly reduced as a result.

Condition of Discharge Line Bent, Kinked, Porous or Restricted Discharge Line. A restricted discharge line will cause slow pressure build and the

(See Symptom 9.0 items f & g) compressor to run hot. Compressor life will be signiﬁ cantly

reduced and could cause engine damage.

Governor

Broken or Loose Mounting Replace Some governors are mounted at the air dryer. They require a

Components special mounting gasket and are normally set to cut out at 130 PSI.

Exhaust Port Location The governor should be mounted so the exhaust port If the governor’s exhaust port can’t be mounted pointing down, an

is pointing down. exhaust check valve may be installed to stop contamination from

entering the port. Contamination will reduce the life of the governor.

Air Dryer

Broken or Loose Mounting Replace

Components

The Air Dryer is Bypassed If the air dryer has been bypassed, make the necessary When the air dryer is bypassed, moisture enters the air system

repairs and drain all reservoirs. and freezes. Moisture washes lubrication off of valves and creates

rust. Contamination in the air system can cause brake failure.

Heater and Wire Condition Replace broken wires. Make sure the plug is seated 12v DC or 24v DC should be at the plug when the vehicles

properly. ignition is turned on. An inoperable heater will cause air dryer

freeze up in cold weather.

Excessive Oil at Exhaust Though some oil and water is normal at the exhaust Poor maintenance will cause premature valve failure and possible

Port port, excessive oil and water are an indication of poor system freeze up in colder temperatures. Never pour liquids

air dryer/ compressor maintenance. (See Symptom 3.0) such as alcohol into the air brake system.

Reservoirs

Broken or Loose Mounting Replace

Components

Proper Drain Cock Air leaking with the drain cock in the closed position. FMVSS 121 requires drain cocks function properly so that

Operation Air won’t drain when the drain cocks are open. operation of the reservoir’s single check valves can be validated.

Leakage reduces compressor life.

Drain Reservoirs

Contamination in Reservoirs Though some oil and water is normal in reservoirs, Excessive oil and water in the reservoirs takes up capacity which

excessive amounts are not. In order to determine what causes the compressor to run longer and hotter leading to

is excessive it will be necessary to run an the Basic Oil compressor failure. Contamination can exit the reservoirs and

Passing test. The test requires the vehicle to be retested make it into the braking system. Contamination causes early

at a later date. (See Symptom 4.0) valve failure and could cause loss of brakes.

Printed on recycled paper

Please refer to BW1971 (Advanced Troubleshooting Guide for Air Brake Compressors) for Troubleshooting Information

Summary of content (2 pages)

PAGE 1
External Vehicle Walkaround Air Brake System Inspection Please refer to BW1971 (Advanced Troubleshooting Guide for Air Brake Compressors) for Troubleshooting Information Date: Invoice Number: Customer Name: Completed By: Brake System Component Compressor Check For: Broken, Cracked, or Loose Mounting Flange Oil Leaks OK Requires Repair or Adjustment Needs Further Diagnosis Quoted Symptom Notes/Clarification/Impact Replace Exterior leaks at the gaskets. (See Symptom 2.
PAGE 2
Glad Hands/Hoses Broken / Cracked / Worn Condition Contamination Seals Valves/Air Lines Broken or Loose Mounting Components Excessive Oil at Exhaust Port Replace Clear contamination from glad hand. Make sure dummy glad hands are used when glad hands are not connected. Worn or cracked glad hand seals should be replaced. Replace Broken or Loose Fittings Though some oil and water is normal at the exhaust port, excessive oil and water are an indication of poor air dryer/compressor maintenance.