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(3) Parking Brake Operation
To apply the parking brake:
) Press on both pedals.
) Move the parking brake lever to LOCK (fully up).
) Release your foot pressure on the pedals.
) If necessary, pump the brake pedals.
To release the parking brake, move the lever to RELEASE (fully up).

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Figure 4: Wheel Brake Assembly
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Trouble-Shooting
1. General
Use the data below to trouble-shoot the wheel and brake system.
Complaint  Possible Cause  Remedy 
Too much tire wear.  Incorrect toe-in. Incorrect inflation pressure.  Adjust the toe-in. Refer to Section 32-10. Correct inflation pressure. 
Too much axial play in a wheel.  Main wheel incorrectly adjusted. Defective wheel bearing.  Adjust the main wheel. Replace the wheel bearing. 
Brake disk distorted.  Brakes applied too hard. Hard landing.  Replace the brake disk. 
Brakes do not hold static engine run-up with the usual pedal force.  Brake fluid level low. Air in the brake system. Defective master cylinder. Defective caliper. Worn brake linings. Leaking connector.  Fill the system with brake fluid. Bleed the brake system. Replace the master cylinder and then bleed the brake system. Replace the caliper and then bleed the brake system. Replace the brake linings and then bleed the brake system. Tighten (or replace) the connector and then bleed the brake system. 

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Maintenance Practices
1. General
These maintenance practices tell you how to remove/install components. They also give the conditioning procedure for the brake linings. Refer to the manufacturer's data (Cleveland/Parker Hannifin Corporation) for other shop work.
2. Remove/Install a Main Wheel
A. Equipment
Item  Quantity  Reference 
Airplane jacks  3  Commercial 

B. Remove a Main Wheel
%

%
%

Detail Steps/Work Items  Key Items/References 
(1)  Remove the wheel fairing: S Remove the brake cover. S Remove the outer bolt. S Remove 4 screws from the inner side.  Only if the optional strut fairing (O.M 40-106) is installed. 
(2)  Lift the airplane on jacks.  Refer to Section 07-10. 
(3)  Remove the back-plate from the brake caliper.  Cut the locking wire. 
(4)  Remove the lock-bolt from the axle nut. 
(5)  Remove the axle nut. 
(6)  Pull the wheel from the axle. 

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C. Install a Main Wheel
%
%

DA 40 Series

Detail Steps/Work Items  Key Items/References 
(1)  Apply a light coating of grease to the axle where the wheel bearings go.  Use grease MIL-G-3545. 
(2)  Put the wheel in position on the axle.  Make sure that the brake caliper is correctly engaged on the torque plate. 
Note: Turn the wheel by hand while you tighten the axle nut. This will remove grease (which can separate the bearings) or burrs. Both can cause too much wheel bearing play later. 
(3)  Install the axle-nut.  Hand tight. 
(4)  Loosen the axle nut until it is just loose. 
(5)  Tighten the axle nut.  Hand tight. 
(6)  Loosen the axle nut until one of the 2 holes in the axle aligns with the nut. 
(7)  Install the lock-bolt, washer and self-locking nut.  Do not loosen the nut more than 30° (half of a flat). 
　
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