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Technical Bulletin

Bulletin No.: PRO-03-30 Effective Date: 1/1/91 Page: 1 of 3

Subject: E-1 Single Circuit Brake Valve Obsolescence And

Changeover

When our current stock of E-1 brake valves is depleted, this valve will no longer be

available for service replacement, either as new or remanufactured exchange. Because

of this obsolescence, those vehicles currently using the E-1 single circuit brake valve will

be required to changeover to a currently produced brake valve.

Background

The E-1 brake valve is of single circuit design and was primarily used on pre-1975 transit

and parlor coaches because of its generous graduating range. The larger graduating

range of the E-1 requires greater treadle movement per pound of air pressure delivered.

This fact results in the driver being able to more easily control small increases or

decreases in braking pressure which is sometimes desirable in coach operation.

Changeover Options

While several changeover options are possible the most appropriate are:

1. The E-1 can be replaced with the E-3 single circuit brake valve.

2. The E-1 can also be replaced with the E-10 dual circuit brake valve.

Each changeover option has some positive and negative aspects to be considered

before a choice is made.

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Technical Bulletin 1

Sommario

Pagina 1 - Technical Bulletin

Technical BulletinBulletin No.: PRO-03-30 Effective Date: 1/1/91 Page: 1 of 3Subject: E-1 Single Circuit Brake Valve Obsolescence AndChangeoverWhen ou

Pagina 2

E-1 to E-3 ChangeoverAdvantagesThis changeover is the most easily accomplished since the existing vehicle air lines,along with the treadle and mountin

Pagina 3

DisadvantagesSince the E-10 is a dual brake valve some piping changes will be required. The singleair supply line which was connected to the E-1 must