Cirrus SR22 Pilot Operating Handbook page 214

Section 7
Systems Description
Braking pressure is initiated by depressing the top half of a rudder
pedal (toe brake). The brakes are plumbed so that depressing either
the pilot's or copilot's left or right toe brake will apply the respective
(left or right) main wheel brake.
The reservoir is serviced with MIL-H-5606 hydraulic fluid (Serials 3915
thru 4030, 4032, 4045 before SB2X-32-21), or MIL-PRF-87257 hydraulic
fluid (Serials 3915 thru 4030, 4032, 4045 after SB2X-32-21, 4031,
4033 thru 4044, 4046 & subs).
Brake system malfunction or impending brake failure may be indicated
by a gradual decrease in braking action after brake application, noisy
or dragging brakes, soft or spongy pedals, excessive travel, and/or
weak braking action. A temperature sensor is mounted to each brake
assembly and provides measured brake temperatures to the avionics
system for caution and warning annunciation.
Should any of these symptoms occur, immediate maintenance is
required. If, during taxi or landing roll, braking action decreases, let up
on the toe brakes and then reapply the brakes with heavy pressure. If
the brakes are spongy or pedal travel increases, pumping the pedals
may build braking pressure.
Refer to Section 10,
System operational considerations.
Parking Brake
Do not set the PARK BRAKE in flight. If a landing is made with
the parking brake valve set, the brakes will maintain any
pressure applied after touchdown.
The main wheel brakes are set for parking by using the PARK BRAKE
handle on the right side kick plate near the pilot's right knee. Brake
lines from the toe brakes to the main wheel brake calipers are
plumbed through a parking brake valve. For normal operation, the
handle is pushed in. With the handle pushed in, poppets in the valve
are mechanically held open allowing normal brake operation. When
the handle is pulled out, the parking brake valve holds applied brake
pressure, locking the brakes. To apply the parking brake, set the
brakes with the rudder-pedal toe brakes, and then pull the PARK
BRAKE handle aft.
7-28
Taxiing, Steering, and Braking Practices
• Caution •
Cirrus Design
SR22
for Brake
P/N 13772-004
Revision 1