http://www.hmttractors.co.in/Model_3522.aspx
they started building the 3011 under license. you can see one pulling the cultivator in this video:
http://youtu.be/XllPMrZkLPo?t=1m57s
Then the 3511 allmost 1 to 1 copy:
http://olx.in/item/tractor-hmt-3511-brand-new-condition-IDSuoGb.html
but the current 3522 is a 3511 minus the 1st gear:
http://www.hmttractors.co.in/Model_3522.aspx
Here technical specs:
http://hmti.avishkaar.net/hmti/pdf_Tractors/3522%20-%20DX.jpg
They DO say it has disk brakes... About the tractors
Zetor sold to Iseki to be sold under Iseki name in Japan, i dont know what brakes they had, but i wouldnt be surprised if it is also Zetor tech incorporated in the Indian version... AVL of Austria, an engine and driveline development bureau did some work on it, but i have no idea what they changed, apart from fitting an Indian brand of
fuel pump: At least they dont use a Motorpal pump, thats what i know. Zetor dealers who sold the smaller ones (mostly 3511 when 4911 and 5011 were the smallest Zetors offered) back in the day, said that they did notice that the original Zetor product was better... But hey, everything was better in the past
The larger models are most likely Zetor Super 50's set to 2200rpm. The Swedish importer also sold the Super 50 at 70hp and 2200rpm on special request.
As far as i know, there were never any 4wd tractors made in India AT ALL untill the last 5 years. But certainly no Zetor based 4wd's were made in India.