Service bulletin SD-03-3611_009

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

NHTSA's summary

Service Data: Bendix® PP-1®, PP-2™, PP-5™, PP-8™, & RD-3™ Push-Pull Type Control Valves The Bendix® PP valves are push‑pull, manually operable, on‑off air control valves with an exhaust function. Most are pressure sensitive, so that they will automatically move from the applied to the exhaust position as supply pressure is reduced to a certain minimum, depending on the spring installed. The exception to this is the Bendix® PP‑8™ valve and some Bendix® PP‑1® valves which do not contain a spring. The PP‑8 valve also has a larger diameter shaft for button mounting so that when installed on the same panel with other PP valves, the buttons cannot be inadvertently mixed. The PP-8 valve is normally used to operate tractor spring brakes independently from the trailer. The Bendix® PP‑5™ valve is unique in having an auxiliary piston in the lower cover which, upon receiving a pneumatic signal of 18 psi or more, will cause the valve to move from the applied to the exhaust position from a 100 psi application. The Bendix® RD‑3™ valve differs slightly in that it normally remains in the exhaust position and requires a constant manual force to hold it in the applied position. The Bendix® PP‑2™ valve has an auxiliary port which may be plumbed into a service brake line to release the spring brakes if a service application is made, preventing compounding forces on the foundation brakes.

The document

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The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes

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