The individual valves are very simple to rebuild. This is a package unit though so it may be more difficult. That particular relay has a spring under the valve that determines the crack pressure so the crack pressures need to be the same if you replace it. More than likely the crack pressure is 4 psi. Crack pressure is the pressure that determines when the valve starts to open/sending air to the brake chamber from the supply line. That is the pressure you send it from the brake treadle valve. I saw that valve package somewhere yesterday online for 300 dollars or so. Don't remember the exact amount. Watch this video and good luck.
Air leak
Discussion in 'Trucks [ Eighteen Wheelers ]' started by ColumbiaBoB, Nov 6, 2015.
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Well i took it apart and as you can see rubber thing is the problem, can that be replaced or just buy new. Thx
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Where would you even buy such a thing
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One more
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Had to replace it,but just the middle part. Local freightliner had it for 90.78+tax, not bad. Thx for all the help and keep on trucking.
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