Seja a correia, seja a suspensão, consertamos tudo.

Seja ... seja ... is a set expression meaning something like:

• whether ... or ...
• be it ... or ...
• whether it’s ... or ...

So Seja a correia, seja a suspensão, consertamos tudo means the speaker is listing examples and saying that no matter which one it is, they fix it.

It is a somewhat polished or advertising-style structure. In everyday speech, many Brazilians might also say something simpler, such as:

• Seja a correia ou a suspensão, consertamos tudo
• Quer seja a correia, quer seja a suspensão, consertamos tudo
  (more formal)
• Consertamos tudo, seja correia ou suspensão
  (more natural in some contexts)

Yes. Seja is the present subjunctive form of ser for eu / ele / ela / você.

Here, though, it is not being used in the simple literal sense of to be. In the expression seja ... seja ..., it works idiomatically to introduce alternatives:

• Seja X, seja Y... = whether X or Y...

So this is less about the normal meaning of ser and more about a fixed construction.

Because the pattern is exactly seja X, seja Y. The repetition is part of the structure.

So:

• Seja a correia, seja a suspensão...

This repeated form emphasizes that either possibility is covered.

You can think of it like:

• be it the belt, be it the suspension...

It sounds balanced and stylistically strong, which is why it works well in ads or business slogans.

The commas separate the paired alternatives from the main statement.

Structure:

• Seja a correia, seja a suspensão = alternative 1 / alternative 2
• consertamos tudo = main clause

The commas help show the rhythm and make the sentence easier to read. This kind of punctuation is common in more formal or promotional writing.

In Portuguese, articles are often used more than in English.

Here, a correia and a suspensão mean:

• the belt
• the suspension

But in English, the natural translation may not actually use the every time. Portuguese often includes the article when referring to a type of part or item in a general but concrete way.

So even if English might say whether it’s the belt or the suspension or simply belt or suspension, Portuguese naturally uses:

• a correia
• a suspensão

Correia literally means belt, and in this context it is most likely an automotive belt, such as:

• a timing belt
• a drive belt
• another engine belt

The exact kind depends on context. Since suspensão is also a car part, the sentence clearly sounds like something from an auto repair shop.

Because Portuguese often drops subject pronouns when the verb ending already makes the subject clear.

• consertamos = we fix / we repair

The ending -amos tells you the subject is we, so nós is unnecessary unless the speaker wants extra emphasis.

So:

• Consertamos tudo = We fix everything

is completely normal.

In isolation, consertamos can mean either:

• we fix / repair
• we repaired

because the present tense and the preterite have the same form for many -ar verbs in nós.

However, in this sentence the meaning is clearly present:

• consertamos tudo = we fix everything

That is because the sentence is making a general claim, like a service description or advertisement.

Yes, consertar is the correct verb.

• consertar = to fix, repair
• concertar = to arrange, coordinate, and in some contexts related to music or agreement

So for mechanical repair, you want:

• consertar o carro
• consertar a suspensão
• consertar tudo

This is a very common spelling confusion, even for native speakers.

Because tudo means everything, while todos means everyone or all of them, depending on context.

Here the idea is:

• consertamos tudo = we fix everything

That is the natural choice when referring broadly to all kinds of things or problems.

Examples:

• Conheço todos. = I know all of them / everyone.
• Sei tudo. = I know everything.

It sounds natural, but somewhat polished and slogan-like. It would fit very well in:

• an advertisement
• a repair shop website
• a flyer
• a business sign

The structure seja ... seja ... is a bit more elevated than casual everyday speech. A Brazilian speaking casually might say something more direct, like:

• Seja a correia ou a suspensão, a gente conserta tudo.
• Consertamos tudo: correia, suspensão, o que for.

So the original sentence is correct and natural, but it has a slightly promotional tone.

That would be too literal and not natural in English.

Even though seja comes from ser, the sentence should be understood idiomatically. Better English versions are:

• Whether it’s the belt or the suspension, we fix everything.
• Be it the belt or the suspension, we fix everything.
• Whether it’s the belt, the suspension, or anything else, we fix it all.

So this is a good example of a phrase that should be translated by meaning, not word-for-word.