A metering valve is used to balance the braking force between the front disc and rear drum brakes. The valve holds off fully applied pressure to the front brakes until the rear shoes are in full contact with the drums.The valve is designed to maintain pressure to the front at between 3 and 30 psi, until the hold off limit off 117 psi is reached. At this point the metering valve opens allowing full fluid pressure to the front brakes. The hydraulic system has completely seperate circuits for the front and rear brakes. If one system fails you should get a warning light when enough fluid is lost in either system. Master cylinder has two systems. How well does the pasrking brake work?
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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