Cadillac 60 Series 1963 Shop Manual page 172

BRAKES
5-7
drum diameter must not be machined over
12.060 inch. Should brake drums be machined too
thin, the intense heat that develops under severe
driving conditions will cause them to distort or
warp.
Replacement brake drums supplied by factory
Parts Warehouses are finish machined at the
factory before being shipped. They do not require
any further finishing before installation, but they
must be thoroughly cleaned with a non-oil base
solvent to remove all traces of the oil or grease
used for rust proofing during storage and transit.
Do not machine drums to roughen the braking
surface. Use coarse emery cloth for this purpose.
6. Break-In of New Linings
New or replacement brake linings, if subjected
to normal usage at speeds under 50 MPH, need no
special break-in. However, the first few brake
applications may be somewhat erratic, and Serv-
icemen may need to stabilize the brakes before
delivering the car to the owner. If brake action is
erratic, one acceptable way to seat the brakes is
to make five or ten moderate brake stops at
speeds of 30 to 40 MPH, at approximately one
quarter mile intervals.
Severe break-in is apt to produce small charred
flakes on the lining surface which will produce a
decided pull. If this should occur, lining surface
should be sanded slightly to remove any flakes.
Use only common sandpaper for this purpose so
that all abrasive particles can be removed with
the lining dust by careful use of clean compressed
air.
7. Wheel Cylinder Removal,
Disassembly and Cleaning
a. Removal
1. Raise car and remove wheel and brake drum.
Blow out dust and dirt from drum and linings,
being careful not to blow dirt around wheel
bearing areas.
2. Remove hydraulic brake hose as described
in Note 11.
3. Remove brake shoe retracting springs and
link.
4. Remove two screws holding wheel cylinder
to backing plate.
5. Disengage wheel cylinder connecting links
from brake shoes and remove wheel cylinders.
CAUTION: Be sure brake fluid does not drip
on brake linings.
Piston Cup
Bleeder Screw
Connecting Link
Piston Cup
Connecting Link Wheel Cylinder Piston
Fig. 8-7 Wheel Cylinder Disassembled
b. Disassembly, Fig. 8-7
1. Remove connecting links and rubber boots
from ends of wheel cylinder.
2. Slide pistons and piston cups from either end
of cylinder.
3. Remove piston cup spring and expander
assembly.
4. Remove bleeder screw assembly.
c. Cleaning
With clean hands, wash all parts except pistons
in clean alcohol. Wipe pistons with clean dry
cloth. Inspect surface of cylinder bore and hy-
draulic passages. Replace wheel cylinder if any
obstructions are observed in drilling holes or if
there are any nicks or burrs in bore.
8. Wheel Cylinder
Assembly and Installation
a. Assembly, Fig. 8-7
1. Install bleeder screw assembly.
2. Install piston cup in one end of cylinder with
lip toward center, and install piston with flat side
toward cup.
3. Place rubber boot over end of wheel cylinder.
4. Install spring and expender assembly.
5. Install other piston cup, lip toward center.
Install piston, flat side toward cup.
6. Install remaining rubber boot over end of
cylinder.
b. Installation
1. Position wheel cylinder on brake backing
plate, slipping cylinder-to-shoe connecting links
in place at same time.
2. Install two screws holding wheel cylinder to
backing plate,