Całe nadwozie jest czyste, a samochód dobrze hamuje.

Because both adjectives agree with nadwozie, and nadwozie is neuter singular.

In Polish, adjectives must match the noun in:

• gender
• number
• case

Here the noun is nadwozie = neuter singular, nominative, so:

• cały → całe
• czysty → czyste

That is why you get całe nadwozie and nadwozie jest czyste.

Both are in the nominative case, because both are the subjects of their clauses:

• Całe nadwozie jest czyste
• samochód dobrze hamuje

So:

• nadwozie = subject of jest czyste
• samochód = subject of hamuje

Nadwozie means the body or bodywork of a vehicle — the outer body part, not the whole car.

A useful contrast is:

• nadwozie = body/bodywork
• podwozie = undercarriage / underside

So this sentence is specifically talking about the condition of the car’s bodywork.

Here całe means the whole / the entire.

So całe nadwozie means the entire bodywork, with the idea that all of it is clean, not just part of it.

English often uses several words here, but in Polish cały / cała / całe is the normal way to express this idea.

Because jest is the present-tense form of być (to be), and Polish normally keeps it in sentences like this.

So:

• nadwozie jest czyste = the bodywork is clean

Unlike some other Slavic languages, standard Polish does not usually omit the present-tense to be in this kind of sentence.

A often links two clauses with a mild contrast or a shift of focus.

Very roughly:

• i = simple and
• ale = but
• a = and / while / whereas, often slightly contrastive

In this sentence, a sounds natural because it moves from one feature to another:

• the bodywork is clean,
• and the car brakes well.

It is not a strong contradiction, so ale would sound wrong here. I is possible in some contexts, but a is very natural for this kind of paired description.

Because dobrze is an adverb, and it modifies the verb hamuje.

• dobry = good (adjective, used with nouns)
• dobrze = well (adverb, used with verbs)

So:

• dobry samochód = a good car
• samochód dobrze hamuje = the car brakes well

Hamuje is the 3rd person singular present tense of hamować.

So:

• ja hamuję = I brake / I am braking
• ty hamujesz = you brake
• on/ona/ono hamuje = he/she/it brakes

Here samochód hamuje literally means the car brakes.

Because the sentence is describing a general characteristic of the car, not one completed braking event.

Hamować is imperfective, so it works well for:

• repeated actions
• general ability
• ongoing action

Here it means something like:

• the car brakes well
• the car has good braking performance

A perfective form would suggest a single completed event, which is not the point here.

Grammatically, Polish present tense can sometimes allow either kind of reading, depending on context.

But in this sentence, the most natural meaning is:

the car brakes well

That is because the whole sentence sounds like a general description of the vehicle’s condition, not a report about what it is doing at this exact moment.

Polish often repeats nouns where English would use a pronoun.

Also, a pronoun here could create confusion:

• nadwozie is neuter, so its pronoun would be ono
• samochód is masculine, so its pronoun would be on

By saying samochód, the sentence stays very clear.

In many contexts, repeating the noun in Polish sounds more natural than using a pronoun too quickly.

Yes. Polish word order is fairly flexible, but the original version is the most neutral and natural.

For example, you could say:

• Samochód dobrze hamuje, a całe nadwozie jest czyste.

That changes the emphasis a little, but the meaning stays basically the same.

The original order simply presents the information in a smooth, standard way:

1. first the bodywork,
2. then the car’s braking.