Do they stop cars in record time? (4,6)

I believe the answer is:

disc brakes

I'm a little stuck... Click here to teach me more about this clue!

'do they stop cars' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'record time?' is the wordplay.
'record' becomes 'disc' (eg a CD, compact disc).
'time?' becomes 'brakes' (I can't explain this - if you can you should believe this answer much more).
'disc'+'brakes'='DISC BRAKES'

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail, The Irish News and The Telegraph.

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