Sounds as if there might be a brake fluid leak somewhere in the system.check the master cylinder to see if the brake fluid is low or almost empty,if the fluid is up then it could be a master cylinder that has an internal leak(meaning the fluid is leaking past the internal seals but not leaking out of the cylinder).it also can be a problem with the abs hydraulic control module leaking.you should have the abs system checked for any codes in that system which may help find the problem quicker,if you don`t find any problem with the other suggestions
Thanks for the reply, upon some further crawling around under the truck in the snow and slush I finally found a corrosion hole in the main line on the frame right under the drivers door.
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Thank-you for the help; upon some further crawling around under the truck in the snow and slush I finally found a corrosion hole in the main line on the frame under the drivers door.
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