Verifico a pastilha de freio e a embreagem.

Verifico is the 1st person singular present indicative form of the verb verificar.

• verificar = to check / to verify
• verifico = I check / I am checking

So the ending -o tells you the subject is I.

A few present-tense forms of verificar:

• eu verifico = I check
• você verifica = you check
• ele/ela verifica = he/she checks
• nós verificamos = we check

Because Portuguese often omits the subject pronoun when the verb ending already makes the subject clear.

So both of these are correct:

• Verifico a pastilha de freio e a embreagem.
• Eu verifico a pastilha de freio e a embreagem.

In Brazilian Portuguese, subject pronouns are used more often than in some other varieties, but they are still frequently left out when the meaning is obvious.

Here a is the feminine singular definite article, meaning the.

• a pastilha
• a embreagem

Both nouns are feminine singular, so they take a.

This is very common in Portuguese. Articles are often used more regularly than in English.

Nouns in Portuguese have grammatical gender, so every noun is typically masculine or feminine.

In this sentence:

• pastilha is feminine
• embreagem is feminine

That is why you use a with both:

• a pastilha
• a embreagem

This grammatical gender does not mean the objects are biologically female; it is just part of how Portuguese grammar works.

Portuguese often uses the pattern noun + de + noun where English may use a noun as an adjective.

So:

• pastilha de freio = literally something like pad of brake
• natural English = brake pad

This structure is extremely common in Portuguese:

• óleo de motor = motor oil
• porta de carro = car door
• sapato de couro = leather shoe

So de is linking the two nouns.

Because freio here is being used in a general descriptive expression, not to mean a specific brake.

• pastilha de freio = brake pad
• pastilha do freio would sound more like the pad of the brake, referring to a specific brake

In many set expressions of the type noun + de + noun, Portuguese usually does not use the article after de:

• copo de água
• motor de carro
• pastilha de freio

So de freio is the normal way to form the compound term.

Because both nouns are separate direct objects, and in Portuguese it is very normal to repeat the article with each one.

So:

• a pastilha de freio e a embreagem = the brake pad and the clutch

Repeating the article sounds natural and clear. In some contexts, Portuguese can omit repeated articles, but here repeating a is the standard and most natural choice.

E means and.

It joins the two things being checked:

• a pastilha de freio
• a embreagem

So the structure is:

Verifico + object 1 + e + object 2

It can be either, depending on context.

Verifico in the present tense can mean:

• I check = habitual / regular action
• I am checking = action happening now

Portuguese often uses the simple present where English might use either the simple present or the present continuous.

If you want to make the ongoing meaning especially clear, Portuguese can also use:

• Estou verificando a pastilha de freio e a embreagem.

But the original sentence is perfectly normal.

Yes, verificar is a good and natural verb, especially in a technical, careful, or slightly formal context.

It suggests:

• checking
• inspecting
• verifying the condition of something

Depending on context, Brazilian Portuguese might also use:

• checar
• conferir
• examinar

But verificar is absolutely standard and correct.

Because they are the things receiving the action of verificar.

Ask: What do I check? Answer: the brake pad and the clutch

So they are the direct objects of verifico.

Structure:

• Verifico = verb
• a pastilha de freio e a embreagem = direct object phrase

Portuguese usually does not need any extra word like to here.

Yes. That would still be grammatically correct.

The meaning would remain the same, but the emphasis or order of mention would change:

• Verifico a pastilha de freio e a embreagem.
• Verifico a embreagem e a pastilha de freio.

Both are fine. The original simply mentions the brake pad first.