lack of boost

I have a 54 zs td mk2 and it seems it's not boosting tidy, starts10 boosting around 2250rpm and cuts off around 3000rpm I have a management light on and it's got 3 codes coming up: 1: P0113- iat sensor 1 circuit high input

2: P0102- maf or vac a circuit low input

3: P1404. Also I've noticed if im in traffic I can feel my brake peddle seeping down but its fine when the engine is not running plus I have no smoke from the exhaust ether can anyone help?

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