JCB 4cx eco brake problem part 1, diagnosing problem

Today we got in our shop a jcb 4cx with brake failure and oil leak, lets take a look then.
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What was in the follow up video icw this problem?.

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Part 2 th-cam.com/video/nmNWaKt4ch0/w-d-xo.htmlsi=bDcXblot-jtnNJ4k

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Part 3 th-cam.com/video/XmV7DVuiXdc/w-d-xo.htmlsi=KPejC75ZQBIVhONA

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ماهو سبب توقف الدواليب الخلفيه عن الدوران