I had a similar problem with my 125, solved it by spraying some white grease on the linkage. if you take the battery out and follow the shifter rod down through the dash tower, you'll see a wedge-shaped piece that should move when the brake pedal moves; this is what you want to soak. make sure to get both sides. sorry that I don't have any pictures of it.
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Ian
Mine: 72 w/ k301, 3 125's, 1 w/ hydro lift, 38,42, & 2 48 decks, 2 42 front blades, QA-36a & QA-42a thrower, tiller, lo-boy 154. Also, LOTS of parts.
family's:2 105's, 2 106's, 149, 2 lo-boy 154s, Farmall Cub.
Non-IH: 1940 JD Model A, 1954 JD 40 U, 1955 JD 40 Crawler, 2 1956 JD 420 U's, both w/ Henry Loader and Backhoe. JD 110. Wheel Horse (model unknown.) Power King 1614. We love our tractors! 
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