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Author Topic: K1300S front disc play  (Read 4773 times)

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Offline richtea

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K1300S front disc play
« on: May 23, 2015, 09:17:49 pm »
Summary:
Should my front discs have some play in the direction of rotation?

Background:
I had a small knock in my front wheel which Motoliner in Maidstone removed. I did their very convenient 'ride in' service (that bit worked a treat by the way).
Once I was back home I noticed that the discs have a little play (say about 1mm) in the direction of rotation, even though the bolts are tight. Is that as designed?

As an aside, and an irritation, I am getting some brake judder. Do the discs have a set position they should been been reset to? (I couldn't see any marks on the disc and wheel to match them up, i.e. hole 1 on the disc should be match to hole 1 on the wheel, etc.)

Cheers...
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Offline Costas

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Re: K1300S front disc play
« Reply #1 on: May 23, 2015, 09:40:21 pm »
Judder might means ball joints.
The disc must have that play that means floating brake disc , so no worries there.
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Offline Phmode

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Re: K1300S front disc play
« Reply #2 on: May 24, 2015, 09:52:40 am »
You can sometimes feel a slight knock from the front discs if you hold the brake on and try to push the bike back and forth rapidly. It is only an issue if you have disc run-out or side to side warping of the disc! Our discs are 'floating' on the rivets to allow them to follow a true path through the pads without 'knocking' the pistons back as the disc oscillates.

There is a discussion on ball-joints here:

http://www.eurokclub.bike/index.php/topic,592.msg5601.html#msg5601

Brian (who thinks that has probably spoiled his Sunday  8) )
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Offline TomL

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Re: K1300S front disc play
« Reply #3 on: May 24, 2015, 06:17:11 pm »
The discs float to allow them to expand without warping when they heat up.
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Offline richtea

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Re: K1300S front disc play
« Reply #4 on: June 05, 2015, 11:27:16 pm »
Update:
- they're floating OK, says NOG (or can I call them NOB?), so Motoliner did a good refit after straightening the wheel
- the discs are also straight, which is good

The pads seem to be the problem (not clear why), but a new set has smoothed the braking out.
Haven't put them on really hard yet, but there's no juddering.

Happy!
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Offline Phmode

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Re: K1300S front disc play
« Reply #5 on: June 06, 2015, 12:55:18 am »
If you haven't put em on real hard yet, you must live in the car park at NOG!

Brian (who normally has em shattering nicely by the time he reaches the roundabout at the A34  8) )
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Elite Evil

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Re: K1300S front disc play
« Reply #6 on: June 06, 2015, 12:43:32 pm »
Are you not meant to brake gently for a couple of hundred miles to avoid glazing?  ???
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Offline Costas

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  • Location:: Athens, Greece, KS-Loutsa 37°58'16.6"N 23°59'06.8"E 37.971269, 23.985224
Re: K1300S front disc play
« Reply #7 on: June 06, 2015, 01:50:36 pm »
Only to let them change heating and cooling circles smoothly and to avoid sudden overheating. After those first 100 miles all are ok. Is that procedure glazing?
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Offline richtea

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Re: K1300S front disc play
« Reply #8 on: June 06, 2015, 04:01:11 pm »
Quote from: Costas on June 06, 2015, 01:50:36 pm
Only to let them change heating and cooling circles smoothly and to avoid sudden overheating. After those first 100 miles all are ok. Is that procedure glazing?

'Glazing' is bad! The reverse of what you've written, Costas. Glazing is cooking the surface by hard braking before the pads have had a chance to go through a few heat cycles like you've described.

I'm a bit of an engine braker (possibly breaker too - I have been through a clutch on other bikes), so I probably need to be careful to warm them up.
I'll let you know the final result next week - commuting 130 miles a day * 5 days next week should bed them in and prove/disprove the solution.  :P
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Offline Costas

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  • Location:: Athens, Greece, KS-Loutsa 37°58'16.6"N 23°59'06.8"E 37.971269, 23.985224
Re: K1300S front disc play
« Reply #9 on: June 06, 2015, 04:45:40 pm »
Ok thanks, good to know the correct technical termination.
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Offline Phmode

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Re: K1300S front disc play
« Reply #10 on: June 06, 2015, 08:07:05 pm »
Never bothered with all that nonesense! Hammer them on and get on with it! Never had a problem in cars or bikes and mine last as long as others seem to and are just as effective!

Brian (whomused to change pads in the middle of a rally on the Escort and just get on with it)
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Elite Evil

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Re: K1300S front disc play
« Reply #11 on: June 06, 2015, 09:59:16 pm »
OK then, quick poll who of us has a brake failure light this week... ;)
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Offline Expo

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Re: K1300S front disc play
« Reply #12 on: June 07, 2015, 12:20:21 am »
Every time I thumb the starter before moving off  :P
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Offline Costas

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  • Location:: Athens, Greece, KS-Loutsa 37°58'16.6"N 23°59'06.8"E 37.971269, 23.985224
Re: K1300S front disc play
« Reply #13 on: June 07, 2015, 08:57:45 am »
hhahahaahah nice one
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Offline Phmode

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  • Location:: Ledbury, Herefordshire
Re: K1300S front disc play
« Reply #14 on: June 07, 2015, 08:11:11 pm »
Not since the Steel Horse horny girl incident last Wed!

Brian (who is keeping his fingers, toes and eyes crossed  ::) )
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