Figure 8-11. Assembly view of the AB-A brake cylinder with lever brackets.
Note. Prior to 1967, some care were equipped
type) duplex release valve part, vent protector, brake
with a two-position retaining valve to control brake
reservoir, combined dirt collector and cutout cock,
cylinder pressure. With the handle In down position, the
branch pipe tee, retaining valve or parts of these items.
brake cylinder air exhausts freely to the atmosphere.
With the handle in up position, it retards the exhaust of
(3) When stenciled markings as required are
air from the brake cylinder down to a predetermined
missing, incorrect, or indistinct.
pressure and then retains that amount.
j. Angle Cocks.
Angle cocks with hose
(1) To secure the required external clearances
connections and couplings are connected on the ends of
the brake. They provide a flexible connection between
and reduce the cleaning time to a minimum, the
following tools and equipment are required by the brake
the brake pipes on adjoining cars.
cleaning personnel for performing their respective
8-13. Cleaning and Testing AB Brakes on Repair
(a) An open end S wrench with 3/4-inch and
13/16-inch openings, for dirt collector, branch pipe tee,
a. Requirements. The complete brake equipment
and cutout cock.
must be cleaned, oiled, tested, and stenciled (COT&S)
(b) Combination socket wrench set for AB
valve portions, flange fittings, and brake cylinder
(1) After expiration of 48 months as indicated
nonpressure head. The set consists of one ratchet-type
by the stencil marking on car; and may be given COT&S
handle, two extensions, one universal joint, and five
attention after expiration of 45 months when the car is
sockets in sizes 9/16- inch, 5/8-inch, 3/4-inch, 13/1.6-
on the repair track regardless of whether or not it needs
inch, and 1 inch. The 13/16-inch socket is required only
for the AB empty and load changeover valve.
(c) Strainer nut wrench for brake pipe
failure to pass the Single Car Test Device Code of
Tests, unless the inoperative condition is due to renewal
strainer nuts, used with handle and extensions listed in
of pipes and fittings (including flange and compression