check engine,vsc,abs, (!), and red (!) are lit

read the codes, or have someone with a prius scanner read them.

 

The buzzer indicates a serious problem. Stop driving the car until it has been repaired.

As you have been advised above, get the codes read so you know with what you are dealing.

 

check the 12v (for free) first

 

The bracket should be tied up tight on the post. You should not be able to move it. In any case, your problem is with the brake accumulator as indicated by the last two codes. You need to determine why/where your accumulator is leaking and repair. In the USA, there is an extended warranty for this problem. Probably not the same in Pakistan. You may need to replace the accumulator and/or pump. It may be possible to get a used unit from a wreckers/salvage yard. To buy new from Toyota is pricy.

You will probably need to look into the LH front speed sensor to get rid off the ABS/VSC lights when you are done fixing the accumulator.

 

Yes.

 

I just re-read this post, what does he mean by the whole ABS. In my mind I read accumulator. I'm not sure what he means by ABS, can you clarify?

 

If he is a qualified Toyota Prius mechanic and not just looking stuff on the "net" then he should know what he talking about. If not, I'd be a be cautious about changing a whole lot of stuff, just because he read it somewhere on the inter-webs.

Has he worked through the diagnostic tree in the service manual?

That is a Actuator assembly in the picture. It seems to be variously called an ABS pump and ABS computer by various (non-toyota) vendors.