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Hasujek |
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Hasujek Two Stroke Sniffer
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Beehive Bedlam |
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Beehive Bedlam World Chat Champion
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Monkeywrenche... |
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Monkeywrenche... Nearly there...
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 14:50 - 22 Feb 2018 Post subject: |
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Minimum varies for each disc. Even between brands for the same model. It's marked on the disc.
Excessively worn brake disc is a fail.
It's a numbers game. The only way it ought to pass if it'sthinner than the markings is if the tester doesn't notice. You could chance your hand and change the disc if it fails. many places do a free retest within a week (but not all of them so check). ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Rogerborg |
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Rogerborg nimbA
Joined: 26 Oct 2010 Karma :
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Posted: 14:57 - 22 Feb 2018 Post subject: |
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Gamble on a used disc = £15
Throw in a new Chinesium disc = £25 (last one on eBay) then £35
Cost of retest = £0 or £15 or £30 if you prevaricate.
There's no obviously right answer since we don't know how strict your MOT tester is, or what condition the rest of the bike is in - it might well fail on something else.
Do you feel lucky, punk? ____________________ Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike |
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MarJay |
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MarJay But it's British!
Joined: 15 Sep 2003 Karma :
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Ste |
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Ste Not Work Safe
Joined: 01 Sep 2002 Karma :
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Posted: 15:04 - 22 Feb 2018 Post subject: |
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Wearing the rear brake disc below the minimum limit on a CBR125 must have taken some effort! |
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Hasujek |
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Hasujek Two Stroke Sniffer
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Ste |
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Ste Not Work Safe
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Hasujek |
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Hasujek Two Stroke Sniffer
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Rogerborg |
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Rogerborg nimbA
Joined: 26 Oct 2010 Karma :
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Posted: 16:36 - 22 Feb 2018 Post subject: |
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You actually did the A1 tests? Good chap (or lady-chap). ____________________ Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike |
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Chris45 |
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Chris45 Nitrous Nuisance
Joined: 23 Oct 2016 Karma :
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Hasujek |
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Hasujek Two Stroke Sniffer
Joined: 16 Nov 2016 Karma :
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Posted: 22:48 - 22 Feb 2018 Post subject: |
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kramdra |
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kramdra World Chat Champion
Joined: 28 Oct 2010 Karma :
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RhynoCZ |
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RhynoCZ Super Spammer
Joined: 09 Mar 2012 Karma :
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Posted: 00:26 - 23 Feb 2018 Post subject: |
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Hasujek wrote: | Ste wrote: | Wearing the rear brake disc below the minimum limit on a CBR125 must have taken some effort! |
Almost 36k miles on the clock with almost 40% of commuting is with pillion haha. |
Not to question your motorcycle skills, but are you sure the brake is working properly, not dragging, you are not keeping your foot on the pedal while riding and most importantly there is still meat on the pads? Even if the brake was dragging and your foot was staying on the pedal, the brake pads compound is still much softer than the brake disc. I'm just curious what, how, eh? I mean, overheating and warping a brake disc is simple enough, but grind it, and especially the rear one, below the minimum thickness in 36k miles?
Wearing a brake disc on a motorcycle to the point it's a scrap metal is something I have never seen, in my entire life. A friend of mine even has a '99 Fireblade with nearly 60k on the clock with original brake discs (all three), I've never had to change a brake disc on any motorcycles due to wear. Even in cars it takes a lot of miles/time to wear the rotors to the minimum thickness or just a mechanically challenged driver. Yes, I do realise car brake rotors are a bit thicker. ____________________ '87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor |
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uberkron |
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uberkron Crazy Courier
Joined: 12 Nov 2012 Karma :
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Hasujek |
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Hasujek Two Stroke Sniffer
Joined: 16 Nov 2016 Karma :
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Posted: 08:53 - 23 Feb 2018 Post subject: |
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RhynoCZ wrote: |
Not to question your motorcycle skills, but are you sure the brake is working properly, not dragging, you are not keeping your foot on the pedal while riding and most importantly there is still meat on the pads? Even if the brake was dragging and your foot was staying on the pedal, the brake pads compound is still much softer than the brake disc. I'm just curious what, how, eh? I mean, overheating and warping a brake disc is simple enough, but grind it, and especially the rear one, below the minimum thickness in 36k miles?
Wearing a brake disc on a motorcycle to the point it's a scrap metal is something I have never seen, in my entire life. A friend of mine even has a '99 Fireblade with nearly 60k on the clock with original brake discs (all three), I've never had to change a brake disc on any motorcycles due to wear. Even in cars it takes a lot of miles/time to wear the rotors to the minimum thickness or just a mechanically challenged driver. Yes, I do realise car brake rotors are a bit thicker. |
I've already been questioned about leaving my foot on the brake. The answer is no I always make sure I take my foot off and don't hover around it. Always check the pads and there was only 1 time I went a little low with them where they started scraping. Not sure how previous owners used the bike as bought it with 18k miles but as I said previously a lot of my riding is with pillion which increases wear, and obviously it's a 125 their pads or discs probably wear of easily. |
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RhynoCZ |
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RhynoCZ Super Spammer
Joined: 09 Mar 2012 Karma :
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Posted: 20:39 - 23 Feb 2018 Post subject: |
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uberkron wrote: | Mr rhyno.
My scooter eats a brake disc each 30,000km.
My Toyota car gets 100,000km to a set of discs.
W203 Benz with v6 I get 80/100,000km.
I've been replacing front disc on mum's Virago every 30/40,000.
Can I buy your invincible discs?
Maybe I'm just an idiot for machining the discs when I change pads? |
Well, the machining sure takes some life out of the discs prematurely.
Invincible discs? Well not sure, I'd say some from Nissin and Tokico.
Why do you do the machining/skimming? ____________________ '87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor |
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uberkron |
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uberkron Crazy Courier
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RhynoCZ |
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RhynoCZ Super Spammer
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RhynoCZ |
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RhynoCZ Super Spammer
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uberkron |
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uberkron Crazy Courier
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Old Thread Alert!
The last post was made 6 years, 58 days ago. Instead of replying here, would creating a new thread be more useful? |
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