Single Cable
Operating Instructions
Principles of Operation
The MICO® Single Cable Lock is a SUPPLEMENTAL safety
device and is NOT to be used in place of the original equipment
parking brake. When used with existing vehicle parking brake,
the MICO® Lock uses a portion of the vehicle’s hydraulic service
brake system to provide additional brake holding action.
When the Single Cable Lock is activated and hydraulic
service brakes applied, hydraulic pressure is locked in the
service brake system. In this way, the hydraulic service
brakes continue to be applied after the operator removes
their foot from brake pedal.
The Single Cable Lock does not increase brake pressure, it
only locks in pressure generated by pushing on the brake
pedal.The harder the operator pushes on the brake pedal,
the higher the pressure in the brake system.
Because the Single Cable Lock is locking hydraulic brake
pressure, any leak in the hydraulic brake system will allow
pressure to decrease and release brakes. The hydraulic
service brake system must be kept in good operating condition
to ensure that pressure locked by the Single Cable Lock will
be maintained.
The MICO® Single Cable Lock has a Low Pressure Warning
Switch. This switch is to be used with a visual or audible
alarm which will alert operator(s) in or around the vehicle of
a possible unsafe reduction in brake system pressure and
holding capability.
When the knob of the Single Cable Lock is moved to the full
lock position, alarm will sound, indicating insufficient brake
holding pressure. The operator then pushes on the brake
pedal until sufficient brake pressure has been reached,
causing alarm to stop. If a loss of pressure occurs in the
locked brake system, the alarm will sound again indicating
insufficient brake holding pressure.
These Operating Instructions must be placed in cab
of vehicle in a place available to operator to ensure
proper operation of the MICO® Single Cable Lock.
The self-adhesive warning label, accompanying
each Single Cable Lock, must be affixed in cab in
view of operator.
Changes in the outside temperature may cause locked up
pressure to increase or decrease. Higher temperatures may
cause increased pressure which may cause brake system
damage and failure. Lower temperatures may cause decreased
pressure which can reduce holding level of brakes. For these
reasons, the MICO® Dual Cable Lock must not be used for
overnight or prolonged parking. To minimize these pressure
changes, the Dual Cable Lock must be released and reapplied
every hour.
In applications where there is no horn or other audible device
on the vehicle, one should be installed. A visual pressure
gauge can also be used to indicate to the operator when
there is adequate hydraulic pressure locked up or when there
has been a pressure loss in the system after lock-up.
MICO is a trademark and registered trademark of MICO, Inc. MICO is registered in the U.S. Patent and Trademark Office as well as in Australia, Canada, Indonesia, Japan, Peoples Republic of China, South Korea, and the European Community.
MICO, Inc.
1911 Lee Boulevard / North Mankato, MN U.S.A. 56003-2507
Tel: +1 507 625 6426 Fax: +1 507 625 3212
Form No. 81-640-039
Revised 1995-05-01
The MICO® Single Cable Lock is activated and released
by a knob/cable.
To activate Single Lock
1. Bring vehicle to complete stop.
2. Set mechanical parking brake.
3. Remove foot from brake pedal and observe if vehicle
remains stationary.
4. Move knob to full lock position as indicated on dash
plate (Figure 1). Alarm will sound. If alarm does not
sound, discontinue use of lock, determine cause and
correct problem before using lock.
5. Apply service brakes firmly until alarm stops.
6. Use wheel chocks, outriggers, and any other means
to keep all wheels that are in contact with the ground
from moving as required by manufacturer recommendations.
Full Lock
If alarm sounds while lock is in use
This indicates unsafe brake system pressure.
Discontinue use of lock, determine cause and
correct problem before using lock.
Full Release
To release Single Lock
1. Retract outriggers and remove wheel chocks.
Remove any other means used to keep all wheels
that are in contact with ground from moving.
2. Move knob to full release position as indicated on
dash plate (Figure 2).
3. Release mechanical parking brake.
Federal regulations require that the parking brakes
are capable of holding vehicles on a 20% grade with
rated capacity load, until intentionally released.
It is recommended that the parking brake and MICO®
Single Cable Lock be tested daily, along with other
safety equipment such as lights, horn, etc.
Testing Procedure
1. The vehicle must be fully loaded and driven on a
20% grade.
2. Parking brake and MICO® Single Lock must be
fully applied with engine running and transmission
in neutral.
3. To test the Single Cable Lock, operator must release
parking brake, leaving MICO® Single Cable Lock
applied, and remain in driver’s seat. Vehicle must
remain parked, without movement, for at least one
4. To test the parking brake, the operator must apply
parking brake, release the MICO® Single Cable
Lock and remain in driver’s seat. Vehicle must
remain parked, without movement.
If the vehicle moves while the parking brake is applied,
parking brake must be inspected and adjusted or
replaced and tested again.
If the vehicle moves while MICO® Single Cable Lock
is applied, all hydraulic brake fittings, hoses, lines,
and wheel cylinders must be inspected for leaks.
Fittings which leak must be tightened or replaced.
Hoses, lines, or wheel cylinders which leak must be
replaced or rebuilt. Vehicle must be tested again and
if it fails to remain parked with MICO® Single Cable
Lock applied, the Single Cable Lock must be replaced
and the original lock should be returned to MICO for
inspection and tests.
This document is intended to provide general information about MICO Products. MICO, Inc. has attempted to present accurate information about MICO Products
in its catalogs, brochures, and other printed materials. MICO, Inc. is not responsible for errors, inaccuracies, or inconsistencies that may exist in any catalog,
brochure, or other printed materials or any damages arising from or related to reliance on information in them. Materials and specifications for MICO Products set
forth in catalogs, brochures, and other printed materials are subject to change without notice or obligation. Refer to for the most recent versions of
our literature. If you have any questions concerning MICO Products, please contact MICO, Inc. All MICO Products and service are sold and provided subject to the
MICO Warranty at in effect on the date of sale or supply.
MICO, Inc.
Form No. 81-640-039
Revised 1995-05-01
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