Pad brek rosak; oleh itu, brek tersebut tidak selamat.

Malay usually puts the main noun first and the describing noun after it.

• pad brek = brake pad
• literally, it is pad + brake

So the head word is pad, and brek tells you what kind of pad it is. This is a very common Malay pattern in compound nouns.

Malay often leaves out the verb to be in sentences like this.

So:

• Pad brek rosak = The brake pad is damaged
• literally: brake pad damaged

This is normal and natural Malay. You do not need a separate word for is here.

Rosak is a state word often translated as damaged, broken, faulty, or not working properly, depending on context.

In this sentence, it describes the condition of pad brek. English needs is damaged, but Malay can simply say rosak after the noun.

Examples:

• Telefon rosak = The phone is broken
• Mesin rosak = The machine is faulty

It can mean either, depending on the situation.

For pad brek, English speakers might translate it as:

• damaged
• faulty
• broken

All are possible, depending on how serious the problem is. Rosak is a broad word for something not functioning properly or no longer in good condition.

Malay does not usually mark tense directly on the verb or adjective-like predicate.

So Pad brek rosak does not itself tell you whether it is:

• is damaged
• was damaged
• has become damaged

Usually, context tells you. On its own, it is most naturally understood as a present current state: the brake pad is damaged.

If Malay wants to make time clearer, it can add time words, for example:

• Pad brek sudah rosak = The brake pad is already damaged / has become damaged
• Pad brek itu rosak semalam = The brake pad was damaged yesterday

Oleh itu means therefore, thus, or for that reason.

It connects the first idea to the result:

• Pad brek rosak = the brake pad is damaged
• oleh itu = therefore
• brek tersebut tidak selamat = that brake is not safe

It is a fairly formal connector, especially common in writing.

Yes, oleh itu is more formal or written.

In everyday speech, people often use:

• jadi = so
• sebab itu = that is why / for that reason

A more conversational version would be:

• Pad brek rosak, jadi brek itu tak selamat.

Notes:

• tak is the casual spoken form of tidak
• itu sounds less formal than tersebut

The punctuation works much like it does in English.

• The semicolon separates two closely related clauses.
• The comma after oleh itu marks it as a linking expression at the start of the second clause.

So the structure is:

• statement
• logical connector
• result

You could also write it as two sentences:

• Pad brek rosak. Oleh itu, brek tersebut tidak selamat.

That would also be correct.

Tersebut means something like that mentioned, that specific, or the one just referred to.

It points back to something already introduced in the discourse. It is more formal than itu.

So:

• brek tersebut = that brake / the brake in question

It helps show that the brake is not just any brake, but the one being discussed.

Both can point to a specific thing, but they feel different in tone.

• itu = more neutral and common
• tersebut = more formal, more like the aforementioned or that said

Compare:

• brek itu = that brake
• brek tersebut = that brake just mentioned / the brake in question

In formal writing, tersebut is very common. In everyday speech, itu is much more common.

Because selamat is an adjective/state, and Malay normally negates adjectives with tidak.

• tidak selamat = not safe / unsafe

Malay generally uses:

• tidak for verbs and adjectives
• bukan for nouns and noun phrases

For example:

• Kereta itu tidak selamat = That car is not safe
• Itu bukan kereta saya = That is not my car

So tidak selamat is the correct choice here.

This is a useful nuance.

The first clause talks about the component:

• pad brek = brake pad

The second clause shifts to the brake as a whole:

• brek tersebut tidak selamat = that brake is not safe

The idea is: because the brake pad is damaged, the brake system is unsafe.

If the writer wanted to refer specifically to the pad again, they would more likely say:

• pad brek tersebut tidak selamat digunakan

So the wording here suggests a move from the damaged part to the larger system affected by it.

On its own, brek does not clearly show singular or plural. Malay often leaves number to context.

So brek can mean:

• brake
• brakes

depending on the situation.

Likewise, Malay usually does not have articles like a or the. Specificity is often understood from context or shown with words like itu or tersebut.

In this sentence:

• pad brek could be a brake pad or the brake pad
• brek tersebut is more clearly that/the specific brake being discussed

Yes, very often.

Malay frequently repeats the noun for clarity, especially in formal writing. Using a pronoun could be less clear here, because ia might refer to either:

• the pad brek
• the brek

So repeating brek tersebut makes the reference clearer.

A pronoun version is possible, but less precise:

• Pad brek rosak; oleh itu, ia tidak selamat.

That ia is more ambiguous than brek tersebut.

Yes. It sounds grammatical and clear, especially in a formal or instructional style.

Its tone is somewhat formal because of:

• oleh itu
• tersebut

A more everyday spoken version might be:

• Pad brek rosak, jadi brek itu tak selamat.

Both are correct; they just differ in register.