Brake Chambers

7-7. Brake Chambers

new diaphragm assures; trouble free operation during the

a. Operation. The air brake chambers converts the

life of the new lining.

pressure of compressed air into mechanical force and

(3) To remove air chamber remove air line (1,

motion.

Air entering the unit forces the chamber

fig.7-2) Remove cotter pin (2) and clevis pin (3) from

diaphragm to flex and carry its push rod outward. When

slack adjuster (4). Loosen and remove the two nuts (5)

pressure is released, the rod and diaphragm resume their

and washer(6) securing air chamber to axle bracket. Pull

static position due to action of the unit return spring.

chamber (7) with push rod /8) up and off chamber axle

When the air flexes the diaphragm carrying the push rod

bracket.

outward, this actuate. the slack adjuster. The rotation of

(4) To examine chamber diaphragm loosen and

the slack adjuster rotates the cam shaft which is

remove ring clamp which horde the mounting plate'

connected to the "S" cam acting on the cam followers of

diaphragm and pressure plate assembly.

the brake -hoes.

(5) When assembling chamber, dust lip. of plate

and diaphragm with talc powder. Before tightening

b. Maintenance Repair.

clamp, align plate and diaphragm with moderate pressure,

sufficient to allow the diaphragm to slip into a firm seat,

(1) At brake adjustment check chamber for dents

without wrinkling or bulging against plates. Test assembly

and leaks, hose or pipe connection. for leaks and wear,

for air leaks with soap suds. and retighten clamps or bolts

and chamber linkages for binds and balanced alignment

as required.

on left hand and right hand brakes.

(6) Reinstall air chamber in reverse order of

preceding step. (3).

(2) At brake reline remove the pressure plate for

inspection which includes the diaphragm, hose or pipe

connection and outrigging. Installation of a

Figure 7-2. Brake air chamber removal.

wheels heels are not supporting any weight.

7-8. Axle Replacement

(2) Disconnect air line connection (1, fig. 7-3) to the

Axle Removed

brake chambers (2) mounted on the axle to be removed.

(1) Raise trailer and support the body so that the

7-4