É importante que você use o capacete e teste o freio antes de andar de moto.

Because é importante que... triggers the subjunctive in Portuguese.

So:

• você usa = indicative, used for facts or habitual actions
• você use = subjunctive, used here because the sentence expresses importance, recommendation, or necessity

This is a very common pattern:

• É importante que você use...
• É necessário que ele vá...
• É bom que nós cheguemos cedo

For English speakers, the subjunctive can feel unfamiliar because English often does not visibly change the verb much in similar sentences.

Because both verbs depend on É importante que você...

The structure is:

• É importante que você use o capacete
• e (que você) teste o freio

In Portuguese, the second que você is omitted because it is understood. Both verbs stay in the present subjunctive:

• usar → use
• testar → teste

So the full underlying structure is basically:

É importante que você use o capacete e (que você) teste o freio...

Here, teste is also present subjunctive, not an imperative.

Why? Because it is part of the clause introduced by É importante que...

• É importante que você use... e teste...

If it were a direct command, you might see something like:

• Use o capacete e teste o freio!

That would be imperative. But in your sentence, both verbs are inside the same subordinate clause after que, so they are subjunctive.

In Portuguese, expressions like é importante, é bom, é necessário, é melhor, and é possível are commonly followed by que + a clause.

So:

• É importante que você use o capacete
• literally: It is important that you wear the helmet

Portuguese usually needs que to introduce that clause. English sometimes uses that, and sometimes leaves it out:

• It is important that you wear a helmet
• It is important you wear a helmet

Portuguese keeps que.

Yes, tu could exist in some regions, but você is the most neutral and widely understood choice in Brazilian Portuguese.

This sentence uses the você form:

• que você use
• que você teste

If you used tu, the verb form would normally change:

• É importante que tu uses o capacete e testes o freio...

However, in Brazil, actual usage with tu varies a lot by region. For learners, você is usually the safest default.

Portuguese often uses definite articles where English may not.

So:

• usar o capacete = wear the helmet
• testar o freio = check/test the brake

In English, we often say:

• wear a helmet
• check the brake(s)

Portuguese tends to sound more natural with the article in this kind of general instruction. It does not necessarily mean one specific helmet already known to the listener; it is just the normal way to phrase it.

Because antes de is the normal structure before an infinitive.

Here:

• andar = infinitive
• so we say antes de andar de moto

Examples:

• antes de sair = before leaving
• antes de comer = before eating
• antes de dirigir = before driving

You use antes que when a new clause with a conjugated verb follows, usually with the subjunctive:

• Saia antes que chova. = Leave before it rains.

So in your sentence, since the next verb is the infinitive andar, antes de is correct.

Andar de moto is the normal expression for ride a motorcycle / go by motorcycle.

In this kind of transport expression, Portuguese often uses de:

• andar de moto
• andar de bicicleta
• ir de carro
• vir de ônibus

Here, de is part of the idiomatic expression. It does not translate word-for-word very neatly, but you can think of it as by or on, depending on context.

So:

• andar de moto = ride a motorcycle / travel by motorcycle

Yes, but the meaning and tone are a little different.

• andar de moto = the most common, broad everyday expression for riding a motorcycle
• pilotar moto = to operate/ride a motorcycle, often sounding a bit more technical or more focused on the act of controlling it

So this sentence sounds natural and general with andar de moto. If you changed it to pilotar moto, it would still be understandable, but it might sound a bit less everyday in some contexts.

Because in the expression andar de moto, the noun usually appears without an article.

This is common in Portuguese transport expressions:

• andar de moto
• ir de carro
• vir de trem
• andar de bicicleta

If you said andar de uma moto, that would usually emphasize a specific motorcycle, not the activity in general.

So:

• antes de andar de moto = before riding a motorcycle / before riding motorcycles in general
• antes de andar na moto dele = before riding on his motorcycle

Freio means brake.

Using the singular here is normal and natural in Portuguese, especially when giving general safety instructions. It can refer to the braking system in a general way, not necessarily just one individual brake part.

Depending on context, people might also say:

• teste os freios = test the brakes

Both are possible, but teste o freio sounds perfectly natural as a general instruction.

Yes. Moto is the common shortened form of motocicleta.

In everyday Brazilian Portuguese, moto is far more common in normal conversation:

• andar de moto
• comprar uma moto
• ele tem uma moto

Motocicleta is more formal or technical.

Yes. Literally, usar o capacete is use the helmet.

But in natural English, we usually say wear a helmet, not use a helmet, when talking about protective gear.

Portuguese usar is broader than English use in many contexts. It can mean:

• use
• wear
• put on

depending on the object.

So:

• usar o capacete = wear the helmet
• usar óculos = wear glasses
• usar um aplicativo = use an app

This is a very common translation issue for English speakers.