Fren kolu fren telini çekiyor.

Because fren kolu is a Turkish noun compound.

A very common pattern is:

• noun + noun
• the second noun takes a special ending

So:

• fren = brake
• kol = arm, handle, lever
• fren kolu = brake lever

English often just puts two nouns together, but Turkish usually marks the second noun in this kind of compound.

Not here.

The ending in kolu looks like a possessive ending, and in other contexts kolu can mean his/her/its arm. But in fren kolu, it is part of the compound itself, not a real possessor meaning.

So in this sentence:

• fren kolu = brake lever

not

• its arm
• his/her lever

Context is very important in Turkish.

Because it is the direct object of the verb, and it is specific/definite.

The base compound is:

• fren teli = brake cable / brake wire

When that noun becomes a specific direct object, Turkish adds the accusative ending. With this type of noun, that appears as -ni:

• fren teli → fren telini

So fren telini çekiyor means it is pulling the / a specific brake cable.

That n is a connecting consonant.

After nouns that already have this kind of ending on them, Turkish often inserts n before another suffix such as a case ending.

So the learner-friendly way to think of it is:

• fren teli = brake cable
• fren telini = brake cable + accusative

The n helps connect the endings smoothly.

Because fren kolu is the subject, not the direct object.

In Turkish, the basic subject form usually has no visible ending. That is often called the nominative form.

So here:

• fren kolu = subject
• fren telini = object
• çekiyor = verb

Because the most neutral Turkish word order is Subject – Object – Verb.

So this sentence is built like:

• Fren kolu = subject
• fren telini = object
• çekiyor = verb

That is very normal Turkish sentence order.

Çekiyor comes from the verb çekmek, which often means to pull.

It breaks down like this:

• çek- = pull
• -iyor = present continuous / ongoing action
• third-person singular has no extra ending here

So çekiyor means:

• is pulling
• sometimes simply pulls, depending on context

Because çekiyor usually sounds more like an action that is happening now or is being described as an active process.

• çekiyor = is pulling / is in the act of pulling
• çeker = pulls / tends to pull / will pull in some contexts

In a mechanical description, çekiyor can sound natural if you are describing how the mechanism is operating.

Because Turkish does not have articles like English the and a/an.

Instead, Turkish shows meanings like definiteness or specificity in other ways, especially through:

• context
• word order
• case endings

Here, the accusative in fren telini strongly suggests a specific brake cable.

Because Turkish builds each compound separately.

English can say:

• brake lever
• brake cable

Turkish also makes both separately:

• fren kolu
• fren teli

You normally would not expect the first fren to automatically apply to both nouns across the sentence.

Literally, tel often means wire. But in mechanical contexts, fren teli is a normal way to say brake cable.

So the exact English translation may vary a little:

• wire
• cable

The Turkish phrase itself is standard and natural.

Yes, Turkish word order is flexible, because endings help show what is the subject and what is the object.

For example, you could move things around for emphasis. But the most neutral, textbook-style order is the one in your sentence:

• Fren kolu fren telini çekiyor.

That is the safest version for a learner to copy first.