A féket ki kell cserélni, a laza kormányt beállítani.

The -t is the accusative ending, which marks the direct object in Hungarian.

So here:

• a fék → a féket
• a kormány → a kormányt

These are the things that need something done to them.

A small extra detail: féket has -et rather than just -t because Hungarian often inserts a linking vowel for pronunciation:

• fék + t would be awkward
• so it becomes féket

A is the definite article, meaning the.

So:

• a féket = the brake
• a laza kormányt = the loose handlebar/steering part

Hungarian uses a / az much like English uses the. Here the speaker is referring to specific parts, not just any brake or any steering component.

Because in Hungarian, when an adjective comes before a noun, the noun usually carries the case ending, not the adjective.

So:

• a laza kormányt = the loose handlebar/steering part
• not a lazát kormányt

This is very normal Hungarian structure:

• piros autót = a red car in the accusative
• nagy házat = a big house in the accusative

The adjective stays in its basic form, while the noun shows the grammar.

Kell means must / need to / have to, and it is very commonly followed by an infinitive.

So:

• ki kell cserélni = must be replaced
• be kell állítani = must be adjusted

Literally, Hungarian is closer to it is necessary to replace / adjust, but in natural English we often translate it as must be replaced / adjusted.

This is one of the most common Hungarian ways to express necessity.

Not in the same way English is.

English often says:

• The brake must be replaced.

Hungarian usually avoids an English-style passive here and instead uses an impersonal necessity construction:

• A féket ki kell cserélni.

That literally works more like:

• The brake, one must replace it or
• It is necessary to replace the brake

But the natural English meaning is still The brake must be replaced.

They are verbal prefixes. These prefixes often change or sharpen the meaning of the verb.

Here:

• cserélni = to exchange / change
• kicserélni = to replace
  The prefix ki- helps give the sense of taking something out and putting another one in.

And:

• állítani = to set / place / adjust
• beállítani = to adjust / set correctly
  The prefix be- often has a sense like in, into, or into proper position.

Hungarian uses these prefixes a lot, and they are very important for meaning.

Because Hungarian verbal prefixes often separate from the verb when another element, especially a finite verb like kell, is involved.

So the normal pattern is:

• ki kell cserélni
• be kell állítani

The prefix belongs logically with the infinitive, but in this structure it appears before kell.

This is very common with modal-like constructions:

• meg akarom nézni = I want to watch it
• el fog menni = he/she will leave
• ki kell cserélni = it must be replaced

Because the second half leaves out kell to avoid repetition.

The full version would be:

• A féket ki kell cserélni, a laza kormányt be kell állítani.

But Hungarian can shorten that to:

• A féket ki kell cserélni, a laza kormányt beállítani.

Once kell is omitted, the prefix and infinitive stay together:

• full form: be kell állítani
• shortened form: beállítani

So both things are happening:

1. kell is understood from the first part
2. without kell between them, be attaches directly to állítani

Yes. Hungarian word order is flexible, and different orders can sound more neutral, more topic-based, or more emphatic.

This sentence starts with the objects:

• A féket...
• a laza kormányt...

That makes it sound like a list of items and what needs to be done to them.

A different order is also possible:

• Ki kell cserélni a féket.
• Be kell állítani a laza kormányt.

Both are correct. The version you have is especially natural in repair notes, checklists, and workshop-style comments, where the parts being discussed come first.