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Snap Ring
Seals
Bolt
Bolt
Tapered Bearing
NOSE WHEEL
Figure 1: Main and Nose Wheels
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Landing Gear
AMM
Max Level 12mm (0.5 in)
Figure 2: Brake System Schematic
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C. Brake System
Figure 2 shows the brake system schematic diagram. The DA 40 has 2 separate brake systems. The pilot’s and co-pilot’s left toe brake pedals operate the left system. They supply pressure to the left brake caliper. The right toe brake pedals operate the right brake system and supply pressure to the right 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 pedals. The outlet from the master cylinder on the pilot’s rudder pedal connects to the parking brake valve. 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 on the bottom flange of the control bulkhead. 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 slowly release. A serviceable parking-brake valve will keep the brakes on for more than 1 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.
) 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.
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Landing Gear
AMM AIRCRAFT
Brake Fluid Reservoirs
Brake Pedals
Top Pivot Pin
Inlet From Co-Pilot's Master Cylinder
Co-Pilot's Brake Master Cylinders
Outlet To Pilot's
Outlet To
Master Cylinder
Parking Brake Valve
Pilot's Brake Master Cylinders
Bottom Attachment Pin
Figure 3: Brake Master Cylinder and Reservoir Installation
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AMM
(2) Pilot’s Brake Operation
When you press on the pilot’s right brake pedal, these things happen: ) The connection from the co-pilot’s 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. ) 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 the pilot’s right master cylinder will cause a right brake failure for the co-pilot. The pilot’s right brake will operate correctly. If the leak is between the pilot’s right master cylinder and the right brake caliper, both pilots will have right brake failure.
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