O calço de travão está danificado.

Calço literally means something like a block, wedge, or pad. In a mechanical or vehicle context, calço de travão refers to a braking part. Depending on the exact machine or system, English might translate it as brake pad, brake shoe, or brake block.

So the structure is clear even if the exact technical English term can vary by context.

O is the masculine singular definite article, meaning the.

It is used because calço is a masculine singular noun:

• o calço = the brake pad/block
• um calço = a brake pad/block

Portuguese uses definite articles very often, sometimes more often than English does.

Here, de means of, but in English we usually do not translate it literally.

So:

• calço de travão = literally pad/block of brake
• natural English = brake pad / brake block

Portuguese often builds these noun combinations with de, where English prefers putting one noun directly before another.

In European Portuguese, travão is the normal everyday word for brake.

In Brazilian Portuguese, freio is much more common.

So for Portuguese from Portugal:

• travão = the expected word

For Brazilian Portuguese:

• freio would often be more natural

This is one of the clearest vocabulary differences between European and Brazilian Portuguese.

Portuguese often uses estar for a state or condition, especially one seen as temporary or the result of something.

So:

• está danificado = is damaged / is in a damaged condition

Using ser here would sound wrong in normal usage, because damage is not being presented as the item’s permanent identity; it is its current state.

This is a very common pattern:

• está partido = it is broken
• está sujo = it is dirty
• está avariado = it is faulty / out of order

The accent in está helps mark the stressed syllable and also distinguishes it from other words.

Most importantly for learners:

• está = is (from estar)
• esta = this (feminine)

So the accent is important both for pronunciation and meaning.

Because it agrees with calço, which is masculine singular.

In Portuguese, adjectives usually agree in gender and number with the noun they describe:

• o calço danificado = masculine singular
• a peça danificada = feminine singular
• os calços danificados = masculine plural
• as peças danificadas = feminine plural

So danificado matches calço.

Here it works as an adjective, meaning damaged.

It comes from the verb danificar = to damage, but in this sentence it describes the condition of the noun:

• está danificado = is damaged

This is similar to English, where damaged can also behave like an adjective.

The ending -ão is a very common Portuguese ending. In European Portuguese it is nasal, so it does not sound like a normal English ow.

travão is pronounced roughly like truh-VAUNG, with the last part nasalized.

A more technical pronunciation is:

• travão → /tɾɐˈvɐ̃w̃/

A useful thing to remember:

• -ão is usually stressed
• the vowel is nasal
• the final sound is not a full English n, even though English speakers often hear something like that

A rough pronunciation guide is:

u KAL-su d(uh) truh-VAUNG shta dɐ-ni-fi-KA-du

A few European Portuguese features to notice:

• O often sounds close to u when unstressed
• de is often reduced
• está often sounds almost like shtá
• unstressed vowels are much weaker than in English

So the sentence may sound more compressed than the spelling suggests.

The plural would be:

Os calços de travão estão danificados.

Changes:

• O → Os
• calço → calços
• está → estão
• danificado → danificados

So everything that needs to agree changes to the plural.

Not necessarily. In real-world mechanical contexts, you may also hear more specific terms, depending on the exact part:

• pastilha de travão = brake pad
• sapata de travão = brake shoe

So calço de travão can be understood, but a more specific technical term may be preferred depending on what part is actually meant. This is common in vehicle vocabulary, where several related words exist for slightly different components.