Thanks Sir jee!
Here is the update
Tariq Mechanic in Mohallah Baboo, Saddar checked the car, he said he need to open the car to check everything, it might take 10 minutes to fix the issue or might take half of the day.
Anyways on 2 persons recommendations, I said to him to fix the issue
He has replaced the below things
01) T-Change which is use to give pressure to all pipes (front 2 and back 2)
02) Front tire Disk changed
03) Back Tire leather disk changed.
04) He has changed the brake oil.
05) In Master Cylinder, he replaced one waaasher
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I tried the car for 8 to 9 times to check brake is working with all 04 tires. initially it was working with just front 2 tires.
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He charged me mazdoori 1800 Rupees
and material cost me around 2800 Rupees.
The brake is working like it should work now.
Thank very much for your help. The mechanic is very expesive and he is experienced. thora chooona to is sy lagaya hai , but I'm still happy that problem is resolved.
Regards,
Siddique