If there's no pressure on your brake pedal it's due to a failure somewhere in the braking system. I can't see any connection between a steering problem and a braking problem.
Most cars have a split-circuit braking system. That is, the front left wheel is on the same line as the rear right wheel. The front right wheel is on the same line as the rear left wheel.
This is just a safety feature: If one brake line loses pressure, the other line still works and you retain 50% of your braking power.
check the level of your brake fluid. If the level has dropped it indicates a leak somewhere. Though be aware that it is possible NOT to lose brake fluid whilst having soft brakes..
Brake pressure is lost due to either a faulty brake master cylinder or a leak at one of the wheels.
Remove each tyre in turn and inspect the piston on the brake calliper. If there's slight wetness caused by brake fluid that indicates a seal (around the brake piston) has failed and is drawing in air.
There's no need to replace a calliper - overhaul kits are available.
The link below shows generic images of brake calliper pistons/seals:
brake calliper piston Google Search
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