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Technical Bulletin

Bulletin No.: PRO-03-19 Effective Date: 7/30/79 Page: 1 of 1

Subject: SR-4 Spring Brake Valve

The SR-4 Spring Brake Valve is used on trailers and is similar in appearance to the

SR-2 Spring Brake Valve. The SR-4 differs in function by utilizing both trailer reservoirs

for normal service braking, but reserving sufficient air pressure to provide a spring brake

release in the event of service system failure.

Reference Figure 1, the complete SR-4 Assembly (pc. no. 101112) consists of an SR-4

Valve sub-assembly (pc. no. 101113), a PR-3 Pressure Protection Valve (pc. no.

286460) and a SC-1 Single Check Valve (pc. no. 229603).

Because of the similar appearance of the SR-2 (I.E.; pc. no. 287386) and the SR-4,

positive identification of the valve is important to insure correct replacement.

The SR-2 and SR-4 valves have different operational characteristics and, therefore, IN

NO CASE SHOULD THEY BE INTERCHANGED WITH EACH OTHER.

The SR-4 Valve sub-assembly piece number is stamped into the valve body (position

indicated in Figure 1). In addition, future production of the SR-4 assemblies will include a

tag which will note service replacement piece number information.

Technical Bulletin 1

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Strona 1 - Technical Bulletin

Technical BulletinBulletin No.: PRO-03-19 Effective Date: 7/30/79 Page: 1 of 1Subject: SR-4 Spring Brake ValveThe SR-4 Spring Brake Valve is used on t

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