Front Brake Judder

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Humbug
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Front Brake Judder

Postby Humbug » Tue Mar 26, 2019 6:11 pm

Having an issue with the front brakes on the 12S with a bit of judder under braking. Thought it was the age old problem of the wheel bearings but these seemed fine on checking. Had the pistons eased as they were sticking a bit but this has not seemed to provide a cure. Changed the discs and pads but still the same. One of the discs does not seem to be contacting the pads fully as there is a bit of rust on the outer edge and when I changed the pads, the pistons seem to be sticking a bit again. Ideas? Should I consider a replacement caliper?

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Justcruising
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Re: Front Brake Judder

Postby Justcruising » Tue Mar 26, 2019 8:53 pm

I would first try cleaning your calipers & inspecting the pistons while exercising their operation in situ as per this YouTube example https://youtu.be/0sHQfnbf9t4 . I service mine this way incl. fluid change every 2y & they work GREAT. Good luck!
2006 R1200S (Magma-Red/titan-silver) - Michelin PR4s, Akrapovic slip-on silencer, Ohlin suspension, Ilmberger Carbon hugger & Carbon valve-covers, Corbin seat.

2010 R1200R
2004 R1200C Montauk

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dave the german
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Re: Front Brake Judder

Postby dave the german » Tue Mar 26, 2019 9:20 pm

Humbug wrote:Having an issue with the front brakes on the 12S with a bit of judder under braking. Thought it was the age old problem of the wheel bearings but these seemed fine on checking. Had the pistons eased as they were sticking a bit but this has not seemed to provide a cure. Changed the discs and pads but still the same. One of the discs does not seem to be contacting the pads fully as there is a bit of rust on the outer edge and when I changed the pads, the pistons seem to be sticking a bit again. Ideas? Should I consider a replacement caliper?


You could get Powerhouse automotive to do a re curb. Heard good reports. Might be dearer than a used calliper but they will be as good as new
'15 R1200GS TE
'06 R1200S
'04 BCR
Yam SR 500 long term restoration
wanna win the lottery and ride my bike

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GerryB
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Re: Front Brake Judder

Postby GerryB » Wed Mar 27, 2019 7:24 am

I had the same ....

EBC brake pads !!!

Waste of money , now trying Ferrodo , see how they go .
Old man ... now .
Ex Off Road & Enduro Rider...

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Humbug
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Re: Front Brake Judder

Postby Humbug » Fri Mar 29, 2019 5:40 pm

Thanks for the ideas chaps
I'm wondering if I might be looking in the wrong places and should I consider the upper and lower ball joints? Anyone had experience of changing these? Cost and difficulty?

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dave the german
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Re: Front Brake Judder

Postby dave the german » Sat Mar 30, 2019 4:02 am

Humbug wrote:Thanks for the ideas chaps
I'm wondering if I might be looking in the wrong places and should I consider the upper and lower ball joints? Anyone had experience of changing these? Cost and difficulty?


they're not that cheap - I think they're close to £100 each. have you got a manual for the bike?
'15 R1200GS TE

'06 R1200S

'04 BCR

Yam SR 500 long term restoration

wanna win the lottery and ride my bike

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Humbug
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Re: Front Brake Judder

Postby Humbug » Sat Mar 30, 2019 7:58 am

Thanks Dave,
Yes I have a manual but am sometimes sceptical of their idea of what is easy or difficult after removing the rear shock. My experience of removing the lower mounting bolt was a little more difficult than the book intimated involving lots of heat, damaged knuckles and a long breaker bar following the comment that the bolt is usually awkward to remove :evil:

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Humbug
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Re: Front Brake Judder

Postby Humbug » Wed Apr 10, 2019 4:08 pm

Just fitted a new set of front wheel bearings to see if this makes a difference before looking at the ball joints. That was my problem twice before so fingers crossed. I'll report back

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slparry
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Re: Front Brake Judder

Postby slparry » Wed Apr 10, 2019 7:01 pm

I've had an out of balance wheel give the feeling of brake judder in the past, as you slow to a certain point during braking the out of balance shows up at a certain speed range …. just another thing to check
--
Steve Parry
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Current fleet: '14 F800GS, '87 R80RS, '03 R1100S BoxerCup, '15 R1200RT LE Dynamic, '90 K1

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Humbug
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Re: Front Brake Judder

Postby Humbug » Thu Apr 11, 2019 4:21 pm

Thanks Steve, I'll have a check of that if the bearings don't fix it. It seems to be at all speeds though, as soon as I apply the front brake.
Now, time to try to wrestle a new headlight bulb in when the spring retainer keeps popping out!!! What a rubbish system of a washer and screw on a plastic mount to hold the retaining spring.

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Humbug
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Re: Front Brake Judder

Postby Humbug » Sat May 18, 2019 11:04 am

Well, after a new wheel, new seals and bearings and new Brembo pads, the judder remains! Discs within permissible run out, wheel straight and true. Next will need to be the callipers. Seem a bit sticky on the inside pistons and the ceramic inserts are cracked although mechanic said that cracked inserts wouldn't affect the braking.
Not sure whether to go down the Motorworks calliper repair kit, second hand callipers at £100 each with 6 months guarantee from Motorworks or rebuild of my old callipers at up to £180 each calliper.
To top it all, neutral light not indicating unless I put light pressure on the gear lever meaning bike won't start without this light pressure. Too much and 1st gear selected!!!
Another option of course to scrap the bike and get something with less miles

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dave the german
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Re: Front Brake Judder

Postby dave the german » Sat May 18, 2019 11:17 am

Any play on any of the front steering/suspension bearings?
'15 R1200GS TE

'06 R1200S

'04 BCR

Yam SR 500 long term restoration

wanna win the lottery and ride my bike

Great Britain
Humbug
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Posts: 444
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Location: Nottinghamshire

Re: Front Brake Judder

Postby Humbug » Sat May 18, 2019 11:31 am

nothing of note Dave, had Mike Overy have a quick look and test ride and he thought it was wheel related. I'm now hoping its a sticking calliper

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nab 301
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Re: Front Brake Judder

Postby nab 301 » Sun May 19, 2019 6:50 pm

Humbug wrote:Well, after a new wheel, new seals and bearings and new Brembo pads, the judder remains! Discs within permissible run out, wheel straight and true.

Does the judder happen with both hot and cold brakes , and have you tried deglazing the discs? I have a Bonneville with a similar problem , the runout seems fine , I rebuilt the caliper and fitted new pads it's a lot better but currently gets worse with warm brakes . Forums suggest new discs are needed , maybe I need to check the runout with a hot disc..
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Nigel

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'03 Bullet 65 project..

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nab 301
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Re: Front Brake Judder

Postby nab 301 » Sun May 19, 2019 6:51 pm

nab 301 wrote:
Humbug wrote:Well, after a new wheel, new seals and bearings and new Brembo pads, the judder remains! Discs within permissible run out, wheel straight and true.

Does the judder happen with both hot and cold brakes , and have you tried deglazing the discs? I have a Bonneville with a similar problem , the runout seems fine , I rebuilt the caliper and fitted new pads it's a lot better but currently gets worse with warm brakes . Forums suggesta new disc are needed , maybe I need to check the runout with a hot disc..
_________________
Nigel

Keep smiling, it makes people wonder what you've been up to!
1999 R1100s (mandarin) '
2018 DL 250V Strom
2019 CB125F Honda.
MZ301 Saxon Fun ( currently retired)
'03 Bullet 65 project..


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