Prøvekjøringen gikk bra, om enn bremseklossen viser slitasje.

Om enn is a somewhat formal way to say although, even though, or albeit.

So:

Prøvekjøringen gikk bra, om enn bremseklossen viser slitasje.

means something like:

The test drive went well, although the brake pad shows wear.

It introduces a contrast: overall things went well, but there is still one negative detail.

Not especially. It is perfectly understandable, but it sounds more formal, written, or slightly literary than everyday speech.

In casual Norwegian, many speakers would more naturally say:

Prøvekjøringen gikk bra, selv om bremseklossen viser slitasje.

So if you learn om enn, it is useful for reading and for more formal writing, but selv om is usually the more everyday choice.

Because Norwegian normally writes compound nouns as a single word.

Here you have:

• prøve = test
• kjøring = driving

Together they form prøvekjøring = test drive

Then -en is added to make it definite:

• en prøvekjøring = a test drive
• prøvekjøringen = the test drive

This is very typical in Norwegian. English often uses separate words where Norwegian uses one compound word.

Because Prøvekjøringen is the definite form, meaning the test drive.

Norwegian often uses the definite form when talking about a specific thing already known in the context.

Compare:

• prøvekjøring = test driving / a test drive
• en prøvekjøring = a test drive
• prøvekjøringen = the test drive

So the sentence is referring to one particular test drive, not the idea of test driving in general.

Gå bra is a very common Norwegian expression meaning to go well.

So:

• Det gikk bra = It went well
• Prøvekjøringen gikk bra = The test drive went well

This is very close to English, since English also says went well. Norwegian often uses gå this way for events, situations, conversations, exams, and so on.

Examples:

• Hvordan gikk møtet? = How did the meeting go?
• Eksamen gikk bra. = The exam went well.

The comma separates the main statement from the contrasting follow-up.

Main statement: Prøvekjøringen gikk bra

Contrasting addition: om enn bremseklossen viser slitasje

In Norwegian, a comma is very natural here because the second part functions as a concessive comment: it went well, although...

So the comma helps signal that small turn in meaning.

That is a very good question, because this is exactly the kind of thing learners notice.

• gikk = past tense, referring to the completed test drive
• viser = present tense, suggesting the wear is a current fact

So the sentence can be understood as:

• the test drive went well at that time
• the brake pad still shows wear now

That said, some learners and even native speakers might expect viste instead, to keep both parts in the past:

Prøvekjøringen gikk bra, om enn bremseklossen viste slitasje.

Both are possible depending on what the speaker wants to emphasize:

• viser = the wear is still true now
• viste = the wear was observed during the test drive

Bremseklossen is the definite singular form of bremsekloss, a compound noun:

• brems(e) = brake
• kloss = block / pad

So:

• en bremsekloss = a brake pad / brake block
• bremseklossen = the brake pad / the brake block

As with prøvekjøring, Norwegian writes the compound as one word.

Depending on context, English might translate it as brake pad or brake block.

Slitasje means wear, wearing down, or wear and tear.

In this sentence:

viser slitasje = shows wear

There is no article because slitasje is being used as an uncountable noun, much like English wear. You normally would not say shows a wear in English, and Norwegian works similarly here.

Compare:

• viser slitasje = shows wear
• har mye slitasje = has a lot of wear
• tegn på slitasje = signs of wear

Yes. The order bremseklossen viser is normal.

Here, bremseklossen is the subject and viser is the verb:

• bremseklossen = subject
• viser = verb

After om enn, Norwegian does not switch to the kind of verb-second order you see in main clauses after certain fronted elements. So this structure is normal and not something unusual you need to memorize separately for this sentence.

Yes. A more everyday version would often be:

Prøvekjøringen gikk bra, selv om bremseklossen viser slitasje.

And if you want both verbs in the past:

Prøvekjøringen gikk bra, selv om bremseklossen viste slitasje.

So the original sentence is understandable and correct, but it sounds a bit more formal because of om enn.