MICO HYDRAULIC BRAKE LOCK

____The Streetrod Manufacturing Co. Inc.____

Part No.	Description
3800 $339.95	provides a temporary "hold" assist for one brake line. Can use with DOT 3, 4, and 5. 12 Volt fits 3/16", 1/4" and 5/16" lines.
3802 $1235.96	Mico 690 dual system

We do not have repair parts. Check with Mico Inc.:

Mico Inc.

1-507-625-6426 Fax: 1-507-625-3212

PO Box 8118 N Mankato, MN 56002-8118

INSTALLATION AND SERVICE INSTRUCTIONS

BE SURE TO READ GENERAL INSTALLATION GUIDELINES SHEET (81-600-001) BEFORE PROCEEDING

WARNING!

All MICO locking devices are supplemental safety equipment which provide additional brake holding action when used with existing vehicle parking brake.
The Low pressure Warning Switch must be used in combination with an audible or visual alarm to signal any loss of system pressure. The Low pressure Warning Switch is explained in the Operating Instructions (form no. 81-620-021). Do not disconnect Low pressure Warning Switch.
All lines, fittings and adjacent areas must be cleaned of dirt or road residue before any lines or fittings are disconnected. Special care must be taken so dirt and road residue are not allowed to enter hydraulic brake system. This may contaminate the system and interfere with proper operation of brakes and MICO locking devices.
Follow procedures outlined in Vehicle Manufacturer's Service Manual or SAE Standards when making new connections or adding to existing brake systems. Use only steel brake tubing conforming to SAE specifications.
Use only brake fluid conforming to latest SAE or DOT Standards. Improper or contaminated brake fluid may cause gummy deposits and softening and swelling of other rubber seals in the entire brake system. Such a condition must be corrected immediately.
Do not use sealants, tapes, Teflon or cement compounds on any connections or fittings. These sealants or compounds can contaminate the hydraulic brake system and interfere with the operation of brake components or MICO locking device.
All fittings and connections must be in good condition and tightened to proper torque values as specified in the installation and service instructions.
Separate models of MICO locking devices are available for brake fluid and for mineral based hydraulic oil. Select model to conform with the type of fluid in system.
Brake hoses, brake lines, MICO locking device, brake components, cylinders, and all fittings must be routinely inspected for leaks, damage or wear. Adequate fluid levels must be maintained. In the event of any loss of fluid, brake system must be carefully inspected for leaks.
After installation, bleed system according to vehicle manufacturer's recommendations.
Follow INSPECTIONS and TESTS section as outlined in the Operating Instructions.
The self-adhesive warning label accompanying each MICO locking device must be affixed in cab in view of operator.
The Operating Instructions must be placed in cab of vehicle in a place available to operator.

WARNING!

MICO Brake Lock is not to be used if four wheel lock up is desired, or with split or dual brake systems. If four wheel lockup is desired, we recommend using our MICO Dualock or Dual 690 Brake Lock System.

MOUNTING BRAKE LOCK

Tubing is not supplied because of the variation in each installation. Install tubing using shortest and most protected route. Use same size tubing when replacing a line, unless otherwise specified.

Thoroughly inspect port threads for any foreign material after removing vinyl plugs.

After installation, Brake Lock may contain air. The air, if not removed, will cause an ineffective and perhaps inoperative brake system.

Mount the Brake Lock on the frame near the brake line using existing hole in the frame if possible. Many times a line supporting bracket will be located in this area. This bracket may be removed and the lock mounted in it's place. The lock will then support the lines.

NOTE

A good ground is needed between the Brake Lock mounting bracket and vehicle chassis. If necessary, scrape the paint off vehicle frame where Lock is mounted.

MOUNTING TOGGLE SWITCH AND DASH PLATE

The switch and plate are typically mounted to the dash. Toggle switch requires a 1/2" diameter hole.

TORQUE SPECIFICATIONS

All flared hydraulic line connections must be torqued to specifications listed below and be free of leakage.

Thread Size        Torque

3/8-24                10.8-20.3 N-m (8-15 lb-ft)

7/16-24               16.3-23.0 N-m (12-17 lb-ft)

1/2-20                 16.3-23.0 N-m (12-17 lb-ft)

9/16-18                20.3-33.9 N-m (15-25 lb-ft)

CONNECTING BRAKE LINES

WARNING!

For all brake systems in use today, including anti-lock, the MICO Brake Lock must be installed between last hydraulic component in supply line and wheels.

NOTE

When installing fittings in Brake Lock Assembly, always hold lock on Hex nut or fitting nearest fitting being tightened. Never hold onto opposite end. Failure to follow this procedure may result in valve body fracture not covered by warranty.

The line from pressure source side must be installed in the end stamped INLET and line from wheels installed in end with pressure switch.

Single System

CONNECTING HORN RELAY AND LOW pressure WARNING SWITCH

Replacement Switch Kits:

02-600-017 (Brake Fluid)

02-600-030 (Hydraulic Oil)

Depending on the electrical load of the warning device, connections can be made in two ways.

(see figure 4)

To utilize the vehicle's horn relay or an auxiliary relay make connection as shown. (See Figure 4).

Connect terminal on brake lock arming switch to dashboard toggle switch. Then connect the corresponding terminal from toggle switch to any 20 amp fused HOT terminal behind the dash (as shown in figure 4).
Connect one terminal of Low pressure Warning Switch (LPWS) to horn relay as shown.

Connect the remaining LPWS terminal to ground THROUGH the dashboard toggle switch as shown.

BLEEDING

See General Guidelines Sheet (Form No. 81-600-001) for bleeding Guidelines.

The hydraulic brake system must be bled whenever any line has been disconnected. There are two methods of bleeding hydraulic systems, pressure bleeding and manual bleeding hydraulic systems, pressure bleeding and manual bleeding. Both methods are acceptable and adequate but pressure bleeding is recommended if the equipment is available. Follow bleeding procedure and instructions as specified by vehicle manufacturer.

CAUTION!

Use only Brake Fluid SAE J1703 or DOT Brake Fluid specified by vehicle manufacturer. Never use brake fluid that has been drained from vehicle.

CAUTION!

If the electrical load of the horn or warning device exceeds 10 amp do not connect the Low pressure Warning Circuit directly to battery current. A horn re-lay must be used to prevent damage to pressure switch contacts.

(see figure 5)

When horn draw does not exceed 10 amps the vehicle horn relay may be by-passed. (See Figure 5).

Connect terminal on brake lock arming switch and one terminal of Low pressure Warning Switch (LPWS) to the dashboard toggle switch (as shown in figure 5). Then connect the corresponding terminal from toggle switch to any 20 amp fused HOT terminal behind the dash.
Connect the remaining LPWS terminal to the vehicle horn as shown.

CAUTION!

Before moving vehicle, a firm pedal must be achieved when Brake Lock is in full release position. If a firm pedal is not achieved, repeat bleeding procedure for Brake Lock and brake system until a firm pedal is achieved. Make several brake applications with vehicle stationary and check fittings for leaks.

TROUBLESHOOTING GUIDE

Brake lock is not field serviceable - do not attempt disassembly. If Brake Lock is damaged by contaminants or impaired in any way return to MICO, Inc. for reconditioning or replacement and service other components accordingly.

PROBLEM	POSSIBLE CAUSE	RECOMMENDED SERVICE
Brake Lock will not apply	*Malfunctioning Toggle Switch	Move Toggle Switch to ON position and test incoming terminal on Brake Lock Arming Switch with test lamp. If lamp lights, Toggle Switch is working properly.
	*Malfunctioning Arming Switch	If Toggle Switch is working properly, move Toggle Switch to ON position and test other terminal on Arming Switch with test lamp. If lamp does not light when brake pedal is de pressed, replace Arming Switch with a new one.
	*Inadequate ground or malfunctioning Brake Lock valve body	If Toggle Switch and Arming Switch are working properly, move Toggle Switch to ON position, then short across Arming Switch terminals. If there is no clicking sound, check for good ground to valve body. If there is still no clicking sound, replace entire Brake Lock.
System locked up and brakes will not release	Excessive pressure locked up	Loosening a wheel cylinder bleeder screw will correct this condition. If this condition repeats, we recommend a gauge to determine locked up pressure.
	Toggle Switch internally shorted or sticking	Check Toggle Switch to see that it is in OFF position. If switch appears to be OFF, disconnect wire lead at switch and reapply brake pedal. If brakes release, replace entire Brake Lock.
	Master cylinder or booster malfunction	Trouble may be somewhere other than the Brake Lock. After brake pedal has been applied firmly and lock does not release then bleed off at INLET. If the brakes release, the cause of the non-release is not in the Brake Lock but in the master cylinder and /or booster. If disconnecting line at INLET side of Brake Lock does not release brakes, then disconnect at OUTLET end Brake Lock. If brakes release, replace entire Brake Lock.
	Lock installed incorrectly between master cylinder and booster	Replumb lock so it is installed between vehicle brake and last hydraulic component in supply line.
Brake system will not hold pressure	Leaking conditions in tubing and/or fittings	Check all tubing and fittings in brake system, tighten or replace where required.
	Leak in wheel cylinder or caliper	Check for moist condition. If moist conditions exists, replace or rebuild.
	Leak in lock valve	Replace lock.
Low pressure Warning Switch operates inadvertently or will not shut off	Locked up pressure leaking off	See problems and conditions under heading "Brake system will not hold pressure".
	Wiring improperly installed or short in wires	Check installation to conform with installation diagram. Check for shorted wiring.
Spongy or soft brake pedal	Air in system, improper bleeding at time of installation	Follow good bleeding practices. Use pressure bleeder when available.
Spongy or soft brake pedal	Slow leak in system	Check fittings and wheel cylinder for leaks. Tighten or replace fittings. Replace worn or damaged wheel cylinder.

*None of these conditions affect release after application. The Brake Lock cannot be applied if any of these conditions occur.

MICO could not possibly know of and give advice with respect to all conceivable applications in which this product may be used and the possible hazards and /or results of each application. MICO has not undertaken any such wide evaluation. Therefore, anyone who uses an application which is not recommended by the manufacturer, first must completely satisfy himself that a danger will not be created by the application selected, or by the particular model of our product that is selected for the application.

MICO has made every attempt to present accurate information in catalogs, brochures and other printed material. MICO can accept no responsibility for errors from unintentional oversights that may exist. Due to a continuous program of product improvement, materials, specifications, and product documentation are subject to change without notice or obligation.

For ordering and information call 1-303-688-6882. Send mail to TSM Staff with questions or comments about this web site. WE DO NOT HAVE A SECURE E-MAIL SITE. You can fax, phone, or mail your order to submit new credit card information. Thank You.

ALL PRICES SUBJECT TO CHANGE WITHOUT NOTICE.