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30 Apr 2009 32-40-00 Doc # DA201-C1
Rev. 15
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DA20-C1 AMM
Landing Gear
Doc # DA201-C1
Rev. 15 32-40-00 Page 1
30 Apr 2009
CHAPTER 32-40
WHEELS AND BRAKES
1. General
This Section gives you the data for the main and nose wheels. It also gives the data for the brake
system. And it gives you the trouble-shooting and maintenance practices.
2. Description and Operation
A. Main Wheel
Figure 1 shows the wheels. The main wheel hub has 2 aluminum alloy halves. Three bolts hold
the 2 halves together. The bolts also hold a brake disk to the inner half of the hub.
The wheel has a tire with an inner tube. Snap rings hold taper roller bearings and grease seals
in each half of the hub. You can remove the bearings for maintenance. The outer half of the
hub has a hole for the valve stem.
B. Nose Wheel
The nose has a similar construction to the main wheel. But it has sealed ball bearings.
Figure 1: Main and Nose Wheel
Landing Gear
DA20-C1 AMM
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29 Apr 2004 32-40-00 Doc # DA201-C1
Rev. 9
Figure 2: Brake System Schematic
DA20-C1 AMM
Landing Gear
Doc # DA201-C1
Rev. 0 32-40-00 Page 3
19 Dec 1997
C. Brake System
Figure 2 shows the brake system schematic diagram. The DA20-C1 has 2 separate brake
systems. The pilots and co-pilots left rudder pedals operate the left system. It supplies pressure
to the left brake caliper. The right rudder pedals operate the right brake caliper.
Figure 3 shows the brake master cylinder and reservoir installation. Each system has a brake
fluid reservoir. The reservoir attaches to the master cylinder on the co-pilot’s rudder pedal. The
outlet from the master cylinder on the co-pilot’s rudder pedal connects to the inlet of the master
cylinder on the pilot’s rudder pedal. The outlet of the master cylinder on the pilot’s rudder pedals
connects to the parking brake valve. And the parking brake valve connects to the brake caliper.
Figure 4 shows the wheel brake assembly.
Figure 5 shows the parking brake valve installation. The parking brake valve is located below
the right seat. It contains 2 valves which can seal the brake pressure into the calipers. This
keeps the brakes on. The pressure will reduce in time. And the brakes will release. A
serviceable parking brake valve will hold the brakes on for more than one day.
(1) Co-Pilot’s Brake Operation
When you press on the co-pilot’s right brake pedal, these things happen:
− The connection to the reservoir is cut off by the initial movement.
− Further movement pushes fluid past the piston on the pilot’s master cylinder.
− The fluid flows through the parking brake valve to the right brake caliper.
− The fluid pushes the piston and the pressure plate against the brake disk.
− The reaction force on the caliper pulls the back plate against the brake disk.
− And the right brake is applied.
In the same way, when you press on the co-pilot’s left brake pedal, the left brake is applied.
Landing Gear
DA20-C1 AMM
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19 Dec 1997 32-40-00 Doc # DA201-C1
Rev. 0
Figure 3: Brake Master Cylinder and Reservoir Installation
DA20-C1 AMM
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Rev. 9 32-40-00 Page 5
29 Apr 2004
(2) Pilot’s Brake Operation
When you press on the pilot’s right brake pedal, these things happen:
− The connection from the co-pilots master cylinder is cut off by the initial movement.
(Note: Any hydraulic pressure from the co-pilot’s master cylinder pushes on the back of
the piston in the pilot’s master cylinder. This increases the brake pressure).
− The fluid flows through the parking brake valve to the right brake caliper
− The fluid pushes the piston and the pressure plate against the brake disk.
− The reaction force on the caliper pulls the back plate against the brake disk.
− And the right brake is applied.
In the same way, when you press on the pilot’s left brake pedal, the left brake is applied.
Note: If one side of the system fails, one or both pilots can loose braking on that side.
For example, a leak in the pipe between the co-pilot’s and pilot’s right master
cylinders will cause a right brake failure for the co-pilot. The pilot’s right brake
will operate correctly. If the leak is between the pilots right master cylinder and
the right brake caliper, both pilots will have right brake failure.
(3) Parking Brake Operation
To apply the parking brake:
− Press on both pedals.
− Pull the parking brake knob fully aft.
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