Hudson 1938 Terraplane, Owner'S Manual

Page: 67 / 82

O W N E R' S M A N U A L 65
Fluid should be used at all times to insure against the use of brake fluid containing
mineral oil or other fluids detrimental to the rubber parts which are apt to swell and
become inoperative.
Dirt is injurious to the system and extreme care should be taken to wipe off cap (2),
Figure 57, before removing the cap for inspection and filling.
As pressure is exerted on the master cylinder piston (6), Figure 57, through the brake
pedal, the force built up in the hydraulic brake tubes tends to force outward wheel
piston cups and pistons, expanding the brake shoes at the top.
Brake Pedal Adjustment
To insure full return of the master
cylinder piston (6), Figure 57, when the
brake is released, there must be 1/4"
clearance between pedal shank (8), Fig-
ure 57, and the floorboard.
This clearance is obtained by loosen-
ing lock nut (9), removing clevis pin (11)
and turning connecting link (10) to in-
crease length until clevis pin (11) just
enters the rod with the pedal shank (8)
1/4" from the toeboard and the bell crank
against its stop. Reinsert clevis pin (11)
in bottom of ball crank, insert cotter key and tighten lock nut (9). This adjustment is
important, as failure of the piston to return to the end of the cylinder will cause the
brakes to drag.
An occasional filling of the master cylinder reservoir should be the only attention
required to the hydraulic system unless the reservoir is permitted to run dry, a main
line is disconnected or a wheel cylinder is
disconnected for service operations. If the
cylinder runs dry or a main pipe is discon-
nected, it is necessary to bleed the air out
of the lines at all wheel cylinders. If a
wheel cylinder is disconnected, it is neces-
sary to bleed only at that particular cylin-
der.
Bleeding the System
1. Remove screw (D), Figure 59, and screw
the end of the bleeder tube (A), Figure 58, in
its place and allow end of tube to hang in a jar
partially filled with liquid.
2. Unscrew bleeder valve (E), Figure 59,
three-quarters of a turn.
3. Depress foot pedal by hand, allowing
pedal to return to released position slowly.
Continue this operation until air bubbles
Figure 57
Figure 57