That day, we took the 4 disc rotors to Haji Akbar and sons kharadiya in Mitho Khan ahata (Saddar). He machined them for Rs.2,400. We bought new handbrake shoes (Trucktec, Germany) and associated springs and nuts from Zeeshan Autos. They costed Rs.2,400 too! Indus Autos had some other brand for Rs.1,900, which Zeeshan Autos guys said was Chinese.
Putting them back was a nightmare (as told) for the mechanic since this was the first mercedes he was doing. Nonetheless he took around an hour to put the first one in. Second was easier. Though in putting that in, he discovered that one side was showing no pull/release when handbrake was applied/release. This was perhaps the reason why a pair of handbrake shoes looked like new and the other completely worn out! (See picture). He fixed that.
Finally, the work paid off and handbrake now feels good.
We asked for Silicone Grease but could not find it from anywhere so could not service the calipers of the brakes. I will check from some good Lube shops later.
The mechanic did not have proper tools to lower the exhaust center muffler so inspection of the center bearing was left behind.
While working underneath in the front section of the car, the mechanic noticed a leak (which none of the two other mechanics who had worked on my car noticed or pointed out) under the engine, allegedly from some sensor washer (as the mechanic put it). I attach picture. The leak is not very severe since there was very little oil effect on the under engine shield.
@xulfiqar Sb, please let me know how does it look like, why was it caused, is it severe, if it can be a DIY and if so, what should we buy (in parts) before getting it done. I guess we will loose oil in doing so, so I have pended it until next oil change, some 3000 miles later, IA.