BENDIX®AD-IS®AIR DRYER AND RESERVOIR SYSTEM

TROUBLESHOOTING CHART

SYMPTOM

CAUSE

 

REMEDY

1. Dryer is constantly “cycling” A.

Excessive system leakage.

A.

Test for excessive system leakage. Allowable leakage

or purging.

 

 

observed at the dash gauge:

 

 

 

 

- Single vehicle - 1 psi/minute.

 

 

 

 

- Tractor trailer - 3 psi/minute.

 

 

 

 

Using a Bensoap solution, test vehicle for leakage at the

 

 

 

 

fittings, drain valves and system valves and any accessories

 

 

 

 

(i.e. air suspension) connected to the Bendix® AD-IS®air dryer

 

 

 

 

auxiliary ports. If an accessory is suspected to be the cause

 

 

 

 

of leakage, disconnect that accessory from the air dryer, plug

 

 

 

 

the auxiliary port that it was in, and retest the AD-IS air dryer

 

 

 

 

for proper purge cycling. Repair or replace as necessary.

 

B.

Defective delivery check valve.

B.

Build system pressure to governor cut-out. Wait 1 minute for

 

 

 

 

the completion of the purge cycle. Using a soap solution at

 

 

 

 

the exhaust of the purge valve, leakage should not exceed

 

 

 

 

a one inch bubble in less than 5 seconds.

 

 

 

 

If a rapid loss of pressure is found, the following procedure

 

 

 

 

will determine if the delivery check valve is malfunctioning:

 

 

 

 

Build system pressure to governor cut-out and allow a full

 

 

 

 

minute for the normal dryer purge cycle to empty the purge

 

 

 

 

reservoir. Switch off the engine and apply and release the

 

 

 

 

brakes so that the system pressure reaches governor cut-in.

 

 

 

 

The purge valve will return to its closed position. The purge

 

 

 

 

reservoir has a drain valve which is opened by moving the

 

 

 

 

center lever away from its closed position. Open the drain

 

 

 

 

valve and wait 10 seconds to allow any residual purge

 

 

 

 

pressure to be released. Release the lever, closing the drain

 

 

 

 

valve. Carefully remove the air dryer cartridge using a strap

 

 

 

 

wrench and then test for air leaking through the center of

 

 

 

 

the threaded boss by applying a soap solution to the area.

 

 

 

 

Replace the delivery check valve if there is excessive leakage

 

 

 

 

(exceeding a one inch bubble in five 5 seconds).

 

 

 

 

Re-grease the seal on the air dryer cartridge before

 

 

 

 

reinstalling. Be sure the drain valve on the purge reservoir

 

 

 

 

is not leaking before restoring vehicle to service.

 

C.

Defective governor.

C.

Check the governor at both the “cut-in” and “cut-out” position

 

 

 

 

for (i) proper pressures and (ii) excessive leakage at fittings

 

 

 

 

and exhaust.

D.Compressor unloader mechanism D. Remove the air strainer, or fitting, from compressor inlet

leaking excessively.

cavity. With the compressor unloaded, check for unloader

 

piston leakage. Slight leakage is permissible.

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BENDIX SD-08-2418 manual Symptom Cause Remedy
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SD-08-2418 specifications

The BENDIX SD-08-2418 is a sophisticated air brake system designed for heavy-duty trucks and commercial vehicles. This unit is widely recognized for its reliability and performance in demanding driving conditions. Engineered to enhance safety and control, the SD-08-2418 is particularly popular among fleet operators and vehicle manufacturers.

One of the main features of the BENDIX SD-08-2418 is its advanced modulation technology, which allows for optimal brake application and release. This technology ensures a smooth and controlled braking experience, reducing the risk of wheel lock-up and ensuring that drivers maintain steering control during hard stops. This is crucial for maintaining safety when operating large vehicles under heavy loads.

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In conclusion, the BENDIX SD-08-2418 is a state-of-the-art air brake system that combines advanced features, reliable performance, and ease of installation. Its innovative technology and lightweight design make it a top choice for commercial vehicle operators who prioritize safety, efficiency, and durability in their braking systems. As the demands on modern vehicles evolve, the BENDIX SD-08-2418 remains a key player in the field of heavy-duty braking solutions.
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