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Unbalanced Braking.
POSSIBLE
CAUSES
BRAKES
REMEDIES
175
f)
Fluid leaks at one wheel cylinder.
2) Rust corrosion on th& edges of a wheel cylinder.
3) Seized piston in one wheel cylinder.
4) Hose restricted from swelling or clogged
(if
the
brakes on one axle are excluded, weak braking
may result).
5) Restricted flow in metal pipe which Is crushed or
clogged (if the brakes on one axle are excluded,
weak braking may result).
Weak Braking.
POSSIBLE
CAUSES
1) Fluid leakage from wheel cylinders.
SERVICE BRAKES
Master Cylinder.
The master cylinder operates as follows:
The brake pedal push rod directly actuates the
piston (5, fig. 288).
Tightness at the rear of fluid
chamber is provided by rubber seal ring (8), iden-
tical to valve-ring (3).
The seal ring (8) is stretched on a raised path
of the piston (5) and undergoes compression be-
tween piston shoulder and valve-ring carrier (4)
from return spring (13)
the radial pressure of
which is such as to warrant perfect tightness.
When the master cylinder is inoperative
no
radial pressure is placed on valve-ring (3) which
takes a position to clear by-pass port (11) whereby
fluid is supplied to the master cylinder. Also valve·
ring rotates
in
so doing, thus equalizing wear over
the whole surface and reducing
it
to a negligible
fraction.
Rubber valve-ring and seal ring (8 and 3) develop
a marked toric section their overall diameter being
equal to, or slightly above the cylinder bore, when
1) Dry and clean the brake shoe linings, service the wheel
cylinder and bleed the system.
2) Eliminate rust and replace the boots.
3) Service the wheel cylinder, replace the piston and bleed
the system.
4) Replace or clean the hose and bleed the system.
5) Replace or clean the pipe and bleed the system.
REMEDIES
1) Dry and dean the brake shoe linings, service the wheel
cylinder replacing damaged parts and bleed 1he sys1em.
free. When no hydraulic pressure impends on rubber
valve-ring and seal ring, the outer mid circle only
touches the cylinder wall, whereas edges keep
clear.
When hydraulic pressure comes into action,
radial thrust combined with axial pressure expands
the valve and seal rings, making the master cylinder
tight.
13
5
Fig. 288 - Master cylinder.
1. Master cylinder body.• 2. Fluid transfer holes. - 3. Floating
valve-ring.· 4. Valve ring carrier.· 5. Piston. - 6. Snap ring. - 7. Rub-
ber boot. - 8. Seal ring. - 9. Fluid inlet orifice. - 10. Fluid inlet port.•
11. Compensating orifice. - 12. Outret line
It
T)
connection port. _
13. Piston return spring.
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