Those codes refer to the intake manifold runner, not the brakes, so unless that affects engine vacuum to the brake booster they are not relevant. (A quick search found no correlation.) Manifold runner problems appear to be common in VW/Audi vehicles.

Some turbocharged cars have an auxiliary vacuum pump for the brake booster to keep it working under conditions of low engine vacuum. Rockauto does list such a part for your car so check that it is working properly.

There are many things other than the booster that affect brake performance. What is the status of the rest  of your brake system? Under what conditions is the car hard to stop?

The brake pads, rotor, and master cyclinder and everything else is in good condition.  The car is hard to stop all the time.