Atwood MPD 85233 Installation And Operation Manual

Browse online or download pdf Installation And Operation Manual for Automobile Parts Atwood MPD 85233. Atwood MPD 85233 1 pages. Disc brake actuators used for disc brake applications

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ENGLISH, FRANÇAIS

REFER TO MPD 85778 FOR COMPLETE HYDRAULIC SURGE BRAKE INSTALLTION, OPERATION AND MAINTENEANCE INSTRUCTIONS.

SAFETY ALERT SYMBOLS

Safety Symbols alerting you to potential personal safety hazards. Obey all safety

messages following these symbols.

WARNING

avoid possible

injury or death

FOR YOUR SAFETY READ ALL INSTRUCTIONS

BEFORE INSTALLATION AND OPERATION

Installer:

Provide these instructions to the consumer.

Consumer: Keep documents for future reference.

SCHEMATIC REPRESENTATION OF HYDRAULIC CIRCUIT

INSTALLATION -

DISC BRAKE ACTUATOR SOLENOID BACK-UP VALVE

DEATH OR PERSONAL INJURY

•

This system requires the solenoid wire leads be connected

vehicle back-up light circuit.

8,000 LB. ACTUATORS

are equipped with a solenoid back-up valve.

1. Connect the solenoid valve wire leads to the tow vehicle back-up

light circuit.

2. Connect trailer brake line to actuator.

3. Bleed brake system.

6,000 LB. ACTUATORS

are not equipped with a solenoid back-up

valve. Contact Atwood (815-877-5700) for a Solenoid Back-up Valve

Kit - MPD 80376.

To install Atwood solenoid back-up valve -

1. Remove the plug in return port of master cylinder (this is the

upper port in the master cylinder).

2. Install straight barbed fitting (torque to 16-20 in/lb).

3. Install assembly in supply port of master cylinder (this is the lower

port in the master cylinder).

4. Connect the solenoid wire leads only into the reverse back-up

light circuit.

5. Connect trailer brake line to actuator.

6. Bleed brake system.

BRAKE FAILURE

•

use brake fluid drained from brake system in refilling master cylinder.

DO NOT

Brake fluid can be contaminated from the system.

(et Canada)

CAUTION

avoid possible

injury and/or property damage

WARNING

ONLY

CAUTION

LITERATURE NUMBER

DISC BRAKE ACTUATORS

USED FOR DISC BRAKE APPLICATIONS

INSTALLATION - BRASS ORIFICE FITTING

DAMAGE TO BRAKE ACTUATOR OR VEHICLE

• If brass orifice fitting is not installed, trailer-braking action may cause

vehicle(s) to shake during brake applications.

The brass orifice fitting installed in the master cylinder of the brake actuator

assembly must remain in the hydraulic circuit to the brakes of the trailer.

If the brass orifice fitting must be moved to accommodate plumbing for

a back up solenoid valve, it must be replaced in the hydraulic circuit in

line to brakes.

• Contaminated brake fluid in system could plug brass orifice fitting. This

could render brakes inoperative.

Be especially careful to clean all fittings, tubing and threads between

master cylinder and brass orifice fitting. A very small particle of dirt or

thread sealant can plug the hole in the orifice.

• Do not use Teflon

• If a liquid or paste thread sealant is used, keep it back two threads from end

of male fitting.

• Do not apply sealant to female threads. Clean female threads thoroughly.

BLEED BRAKE SYSTEM

1. Remove master cylinder filler cap and fill reservoir with DOT type 3

into the tow

or 4 automotive brake fluid.

2. Check all hydraulic line fittings & connections to make sure they are

leak free.

3. At brake assembly, connect a bleeder hose to bleeder fitting on wheel

cylinder and submerge free end in a container with brake fluid.

reuse brake fluid.

: Use power bleeder or bar with 2˝ diameter hitch ball attached.

NOTE

Do not use breakaway cable for purpose of bleeding brake system. If

a power bleeder is used air pressure 35 PSI is most effective.

: On tandem axle trailers, bleed brakes on rear most axle furthest

NOTE

from the actuator first.

4. Loosen bleeder fitting at top of brake assembly.

5. Apply actuator and tighten bleeder fitting. Return actuator to

forward position. Again, loosen bleeder valve and apply actuator.

Repeat this procedure until fluid expelled from bleeder hose is free

of air bubbles. It is helpful to lower the trailer tongue to promote air

bubble movement in the brake tubing. It is also helpful to tap gently

along the brake tubing during brake bleeding to keep air bubbles

from sticking to the inside of the brake tubing. During this

procedure, master cylinder reservoir fluid level must be maintained

at no less than 1/2 full and no more than 1/2˝ from top of reservoir.

6. When no air bubbles are visible, close bleeder valve securely and

remove bleeder hose.

7. Repeat

STEP

8. If installation is tandem axle with brakes on both axle, repeat

bleeding procedure on rear axle brakes for second time to assure

positive purging of all air in system.

9. After bleeding has been completed, re-check fluid level in master

cylinder.

MPD 85233

•Installation •Operation •Maintenance

CAUTION

WARNING

DEATH OR PERSONAL INJURY

™

tape on fittings.

1-6 for remaining brake, then brakes on forward axle.

Effective 12/04/07

DO NOT