BENDIX BRAKE CHAMBERS Manual

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Bendix Brake Chambers

DESCRIPTION

The brake chamber is a diaphragm type actuator which

converts the energy of air pressure into mechanical force.

The diaphragm is held between the pressure plate and non-

pressure plate by either a one piece clamp ring or a two

piece clamp ring (Figs. 1 and 2).

INLET PORT

DIAPHRAGM

PRESSURE PLATE

INLET PORT

CLAMP RING

NUTS & BOLTS

CLAMP RING

Different size brake chambers are identified by numbers

which specify the effective area of the diaphragm. A type

30 brake chamber has 30 square inches effective area.

Since one side of a brake chamber diaphragm is exposed

to the applying air pressure and the other side to atmospheric

pressure, the chamber has a pressure and a non-pressure

side. The non-pressure plate is usually vented to atmosphere

with four holes, however, on those installations where the

chamber must be weather-proof, venting is accomplished

through a drilled passage in the mounting bolts and the rod

opening in the non-pressure plate is sealed by either a

boot or an o-ring seal.

The standard diaphragm material is a compound of natural

rubber with a fabric interior of nylon. Neoprene-nylon

diaphragms are optionally available.

Smaller chambers such as type 3 and type 6 have one 1/4

in. NPT inlet port in the center of the pressure plate. Larger

size chambers may have a center port and a side located

port or either one. Current production Type 20 chambers

and larger, generally have 3/8 in. NPT ports to facilitate

compliance with FMVSS 121.

NON

PRESSURE

SPRING

PLATE

PUSH ROD

ASSY.

LOCK NUT

MOUNTING

BOLTS

YOKE