The brake system consists of a brake fluid reservoir, four brake master cylinders, a left and
right shuttle valve, a parking brake valve, and two brake assemblies. If the pilot and copilot
simultaneously apply pressure to the same side brake pedal, the one applying the greatest
pressure will control the braking.
The brake fluid reservoir is located on the right hand side of the cabin sidewall and
incorporates a fluid level indicator.
A separate brake master cylinder, located in the cockpit footwell, is mechanically connected to
each toe pedal. There is no mechanical connection between the pilot and copilot brake pedals.
Two shuttle valves, a left and a right, are used to select inputs from their respective pilot and
copilot brake pedals. Pressing a brake pedal causes the applicable brake master cylinder to
force brake fluid through the respective shuttle valve and parking brake valve to the brake
assembly.
The six piston brake assemblies have steel friction surfaces and three retractors. The
retractors pull the pressure plate back when no hydraulic pressure is applied to the brake
assembly. When the system is pressurized and the retractors are flush with the piston housing,
the brake linings must be overhauled.
The parking brake valve has two off-center cams that hold open poppet valves whenever the
parking brake is released. This allows hydraulic fluid flow through the brake system. When the
parking brake is set, the off-center cams are rotated to allow the poppet valves to close. This
traps brake fluid under pressure between the parking brake valve and the brake assemblies.
To set the parking brake, pull the PARKING BRK T-handle fully out and rotate to lock, then
evenly press both brake pedals. Release pedal pressure and the brakes will remain set. To
release the brakes, rotate and push the PARKING BRK T-handle fully in.
Section 7 - Airplane and Systems Description
Brakes
Pilot's Operating Handbook
Report No: 02406
Issue date: Mar 06, 2020
Page 7-4-10
12-C-A15-00-0704-00A-043A-A
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GENERAL
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