Nice pictures! My ZAU has 2 brake pedals on the left, my ZTU had 3 brake pedals, one on either side for that brake and one extra for applying both brakes at once! I'll have to look at the UTS but I think it only has 2.
I have seen both the Useries and the Gseries with either 2 or three pedals. If i remember correctly this was an option through out the production of the letter series. 2 brakes on the right side had a brake lock lever that was used when the tractors were in road gear.
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