In common with many aircraft from the Soviet sphere of influence, the R-18 uses pneumatics, rather than hydraulics, in its braking system. The upsides are a low total system weight and carefree operation in cold weather – but at the cost of very coarse metering and the need to isolate the air tank from the installation when the aircraft is at rest to prevent leaks. On the R-18, the valve for the tank is located on the floor in front of the seats – a pretty convenient solution compared to some others I’ve seen

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