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I didnt experience any vibration but I can tell you that I stopped and took the time to try and trouble shoot my breaking problem before I invested tons of money and here is what I found. I have a 75 280z but I think the braking system is the same except for I have drums on the back. I experienced a very bad loss in pedal pressure and when I was stopped say for instance at a light I would here a kind of straining whining sound. I didnt know what this was but it was comming from the drivers side of the car. Every time I took off though It went away until I tried to brake again. what I found out was that it was a vacum sound that I was hearing and it was comming from the brake booster { master vac } I found as guy that had some used z parts and picked up a booster for 20.00 dollars! Brand new they are about 200 to 250. It took me and my dad about 20 minutes to install and what do you know it fixed the problem. there was no more vacum leak and it stopped 10 timmes better and faster. with cars that have a lot of miles on them this is a common problem. they just get worn out. you might want to invest the time to just check it out. It might fix your problem. you can get a simple vacuum test at a place like grand auto. ifr there is any other questions please feel free to contact me. Hope it works.
 

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WOW,
Did the stiff pedal happen immediately when you got it back from the shop?
They could have put the check valve(mounted on the firewall in the vac hose between the booster and manifold) backwards. Pull off the valve and test it.
You should only be able to blow air one way only. I think the tapered edge
should point towards the driver side.reverse if needed.
You're right the hard pedal is a indicator of a bad booster or check valve.
Usually a leaking booster will screw up your idle when depressing the brake pedal
cuz this causes a direct vacuum leak to the manifold.
You say hoses were replaced so I assume that they bled the brakes which
should have cleared up the lines.
The front pad wear could be a indication of the proportioning valve being stuck.
Chances are that the pads heated up and warped the new rotors.
I would take the car somewhere else for a though inspection.
 
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