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02:53 Feb 20, 2005
French to English translations [PRO] Automotive / Cars & Trucks
Explanation: Well, I'm not at all sure if this is the correct 'official' technical term (if indeed one exists) --- but I'm just checking in to explain at least what PART of the brake disc I think they're referring to --- as my idea is different from the other answerers' so far.
There are clearly 2 key areas to the brake disc: the machined area on which the brake pads actually press to produce the braking effect; and the (also machined) area where the disc sits against (and is ultimately bolted to...) the actual hub of the wheel.
Whilst the rest of the disk is usually a more-or-less rough casting, these two specific areas are machined with much greater care and precision; one important requirement is clearly that they should be in precisely parallel planes --- if not, the disc would 'wobble' as it went round, and the braking would be seriously compromised.
Tony M France Local time: 21:43 Specializes in field Native speaker of: English PRO pts in category: 452