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A traction valve is provided for use in combination with a relay valve. The traction valve includes a body configured for connection to a housing of the relay valve and defining inlet, outlet and traction supply ports. A first fluid control valve used for traction control is supported on the body an

A traction valve is provided for use in combination with a relay valve. The traction valve includes a body configured for connection to a housing of the relay valve and defining inlet, outlet and traction supply ports. A first fluid control valve used for traction control is supported on the body and includes a valve member that alternately permits and prevents fluid communication between the traction supply and outlet ports in the body. The body and the first fluid control valve are configured to receive any of a plurality of interchangeable second fluid control valves between the inlet port in the body and the first fluid control valve. Each of the plurality of interchangeable second fluid control valves is configured to perform a different function such that the traction valve assumes different configurations upon assembly of the various second fluid control valves with the body and the first fluid control valve.

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1. A traction valve, comprising: a body defining an inlet port, an outlet port, and a traction supply port, said outlet port configured for fluid communication with a fluid chamber defined in a housing of a relay valve;a first fluid control valve supported on said body, said first fluid control valv

1. A traction valve, comprising: a body defining an inlet port, an outlet port, and a traction supply port, said outlet port configured for fluid communication with a fluid chamber defined in a housing of a relay valve;a first fluid control valve supported on said body, said first fluid control valve including a valve member configured to move between a first position preventing fluid communication between said fraction supply port and said outlet port and a second position permitting fluid communication between said traction supply port and said outlet port;wherein said body and said first fluid control valve are configured to receive any of a plurality of interchangeable second fluid control valves between said inlet port in said body and said first fluid control valve, each of said plurality of interchangeable second fluid control valves configured to perform a different function such that said traction valve assumes a first configuration upon assembly of one valve of said plurality of interchangeable second fluid control valves with said body and said first fluid control valve and a second configuration, different from said first configuration, upon assembly of another valve of said plurality of interchangeable second fluid control valves with said body and said first fluid control valvewherein said body includes a first portion having means for attaching each of said plurality of interchangeable second fluid control valves to said body and a second portion defining said inlet port, said second portion configured for attachment to each of said plurality of interchangeable second fluid control valves. 2. The traction valve of claim 1 wherein said first fluid control valve comprises a solenoid valve and said valve member comprises an armature. 3. The traction valve of claim 2 wherein said first fluid control valve includes a pole piece aligned with said armature and defining a fluid passage therethrough, said pole piece having a first end proximate said armature and a second end, opposite said first end, configured to be received within an opening, sized to receive said second end of said pole piece, in each of said plurality of interchangeable second fluid control valves. 4. The traction valve of claim 1 wherein said one valve of said plurality of interchangeable second fluid control valves includes: a housing defining a first port configured for fluid communication with said inlet port of said body; a second port configured for fluid communication with said outlet port of said body through said first fluid control valve, and a third port configured to supply fluid to said fluid chamber of said relay valve; and,a valve member movable between a first seat in which said valve member seals said third port and permits fluid communication between said first and second ports and a second seat in which said valve member seals said first port and permits fluid communication between said second and third ports. 5. The traction valve of claim 4 wherein said another valve of said plurality of interchangeable second fluid control valves includes: a housing defining a first port configured for fluid communication with said inlet port of said body; a second port configured for fluid communication with said outlet port of said body through said first fluid control valve, and a third port configured to exhaust fluid from said fluid chamber of said relay valve; and,a valve member movable between a first seat in which said valve member seals said third port and permits fluid communication between said first and second ports and a second seat in which said valve member seals said first port and permits fluid communication between said second and third ports. 6. The traction valve of claim 1 wherein said one valve of said plurality of interchangeable second fluid control valves includes: a housing defining a first port configured for fluid communication with said inlet port of said body; a second port configured for fluid communication with said outlet port of said body through said first fluid control valve, and a third port configured to exhaust fluid from said fluid chamber of said relay valve; and,a valve member movable between a first seat in which said valve member seals said third port and permits fluid communication between said first and second ports and a second seat in which said valve member seals said first port and permits fluid communication between said second and third ports. 7. The traction valve of claim 1 wherein said body is configured to enclose a portion of said fluid chamber of said relay valve. 8. A traction valve, comprising: a body defining an inlet port, an outlet port, and a traction supply port, said outlet port configured for fluid communication with a fluid chamber defined in a housing of a relay valve;a first fluid control valve supported on said body, said first fluid control valve including a valve member configured to move between a first position preventing fluid communication between said fraction supply port and said outlet port and a second position permitting fluid communication between said traction supply port and said outlet port;a second fluid control valve disposed between said body and said first fluid control valve, said second fluid control valve comprising: a housing defining a first port configured for fluid communication with said inlet port of said body, a second port configured for fluid communication with said outlet port of said body through said first fluid control valve, and a third port; and,a valve member movable between a first seat in which said valve member seals said third port and permits fluid communication between said first and second ports and a second seat in which said valve member seals said first port and permits fluid communication between said second and third portswherein said third port is configurable as any of a supply port through which fluid is delivered to said fluid chamber of said relay valve and an exhaust port through which fluid from said fluid chamber of said relay valve is exhausted. 9. The traction valve of claim 8 wherein said body includes a first portion having means for attaching said second fluid control valve to said body and a second portion defining said inlet port, said second portion configured for attachment to said second fluid control valve. 10. The traction valve of claim 8 wherein said first fluid control valve comprises a solenoid valve and said valve member of said first fluid control valve comprises an armature. 11. The cover assembly of claim 10 wherein said first fluid control valve includes a pole piece aligned with said armature and defining a fluid passage therethrough, said pole piece having a first end proximate said armature and a second end, opposite said first end, configured to be received within an opening, sized to receive said second end of said pole piece, in said second fluid control valve. 12. A traction relay valve for a fluid actuated brake, comprising: a housing defining a fluid chamber, a supply port, a delivery port and an exhaust port;a valve member disposed within said housing and movable in a first direction and a second direction, opposite said first direction;a spring disposed on one side of said valve member and biasing said valve member in said first direction, delivery of fluid on a second side of said valve member urging said valve member in said second direction and permitting fluid communication between said delivery port and said supply port, removal of fluid from said second side of said valve member permitting fluid communication between said supply port and said exhaust port; and,a cover assembly, comprising: a body configured for connection to said housing, said body defining an inlet port, an outlet port, and a traction supply port, said outlet port in fluid communication with said fluid chamber;a first fluid control valve supported on said body, said first fluid control valve including a valve member configured to move between a first position preventing fluid communication between said fraction supply port and said outlet port and a second position permitting fluid communication between said traction supply port and said outlet port;wherein said body and said first fluid control valve are configured to receive any of a plurality of interchangeable second fluid control valves between said inlet port in said body and said first fluid control valve, each of said plurality of interchangeable second fluid control valves configured to perform a different function such that said cover assembly assumes a first configuration upon assembly of one valve of said plurality of interchangeable second fluid control valves with said body and said first fluid control valve and a second configuration, different from said first configuration, upon assembly of another valve of said plurality of interchangeable second fluid control valves with said body and said first fluid control valvewherein said body includes a first portion having means for attaching each of said plurality of interchangeable second fluid control valves to said body and a second portion defining said inlet port, said second portion configured for attachment to each of said plurality of interchangeable second fluid control valves. 13. The traction relay valve of claim 12 wherein said first fluid control valve comprises a solenoid valve and said valve member of said first fluid control valve comprises an armature. 14. The traction relay valve of claim 13 wherein said first fluid control valve includes a pole piece aligned with said armature and defining a fluid passage therethrough, said pole piece having a first end proximate said armature and a second end, opposite said first end, configured to be received within an opening, sized to receive said second end of said pole piece, in each of said plurality of interchangeable second fluid control valves. 15. The traction relay valve of claim 12 wherein said one valve of said plurality of interchangeable second fluid control valves includes: a housing defining a first port configured for fluid communication with said inlet port of said body; a second port configured for fluid communication with said outlet port of said body through said first fluid control valve, and a third port configured to supply fluid to said fluid chamber; and,a valve member movable between a first seat in which said valve member seals said third port and permits fluid communication between said first and second ports and a second seat in which said valve member seals said first port and permits fluid communication between said second and third ports. 16. The traction relay valve of claim 15 wherein said another valve of said plurality of interchangeable second fluid control valves includes: a housing defining a first port configured for fluid communication with said inlet port of said body; a second port configured for fluid communication with said outlet port of said body through said first fluid control valve, and a third port configured to exhaust fluid from said fluid chamber; and,a valve member movable between a first seat in which said valve member seals said third port and permits fluid communication between said first and second ports and a second seat in which said valve member seals said first port and permits fluid communication between said second and third ports. 17. The traction relay valve of claim 12 wherein said one valve of said plurality of interchangeable second fluid control valves includes: a housing defining a first port configured for fluid communication with said inlet port of said body; a second port configured for fluid communication with said outlet port of said body through said first fluid control valve, and a third port configured to exhaust fluid from said fluid chamber; and,a valve member movable between a first seat in which said valve member seals said third port and permits fluid communication between said first and second ports and a second seat in which said valve member seals said first port and permits fluid communication between said second and third ports.