WTF Brake/Front end issue

Anything you like about motorbikes
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

WTF Brake/Front end issue

Post by Wreckless Rat »

OK... 2005 zx10r.

Spanking along on a private road *cough* at about 110-120 - the farmer (his road *cough* ) pulled out of a field. I grab a handful of brake, at it was like my disks were warped...lots of vibration, not much braking... I let off, grab another handful and clinch my seat with my sphincter... again.... thrrrrrrr thrrrrrrrr... again off and on... brakes worked.

After ironing out the crease in my seat... I take a look. Can see nothing.

Odd me thinks.

Try a few hard brakes from 50.... nothing but normal braking...... 80....nothing but normal braking..90......... nothing but normal braking.....120....... nothing but normal braking. Hmm.. maybe a stone or I hit a ripple in the dunno.

Using another private road.....proper smooth tarmac. Grab a handful before going into a bend.... same thrrrrrrrrrr...thrrrrrrrrrr... lots of vibration, little braking, another sphincter clenching moment.

Fuck, this is odd and really not good me thinks.

Again... stop, look, can see fuck all wrong. No sign of hot spots. So again I try loads of braking from different speeds, get the disks pretty hot. Nothing... just normal braking.

Now I have no idea.

Ever come across anything as weird as this??
User avatar
Dodgy69
Posts: 5424
Joined: Mon Mar 16, 2020 6:36 pm
Location: Shrewsbury
Has thanked: 1741 times
Been thanked: 2065 times

Re: WTF Brake/Front end issue

Post by Dodgy69 »

Same symptoms as abs then...
Yamaha rocket 3
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

Re: WTF Brake/Front end issue

Post by Wreckless Rat »

Yeah, it felt pretty much like that.... but there is no abs on the bike....
User avatar
KungFooBob
Posts: 14084
Joined: Sat Mar 14, 2020 1:04 pm
Location: The content of this post is not AI generated.
Has thanked: 537 times
Been thanked: 7475 times

Re: WTF Brake/Front end issue

Post by KungFooBob »

Didn't you do something with the brakes not long ago, paint?

I'd have them to bits and check the pistons or that the pads aren't coming to bits.
User avatar
Dodgy69
Posts: 5424
Joined: Mon Mar 16, 2020 6:36 pm
Location: Shrewsbury
Has thanked: 1741 times
Been thanked: 2065 times

Re: WTF Brake/Front end issue

Post by Dodgy69 »

only on big braking.??
Yamaha rocket 3
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

Re: WTF Brake/Front end issue

Post by Wreckless Rat »

KungFooBob wrote: Sat Aug 08, 2020 5:04 pm Didn't you do something with the brakes not long ago, paint?

I'd have them to bits and check the pistons or that the pads aren't coming to bits.
I did...yes. I have a set of pads to put in (couldn't get them when I rebuilt them) They are worn, but...

Oh well. Have them apart, maybe it needs some Brembo forged monoblocks :wtf:
Dodgy knees wrote: Sat Aug 08, 2020 5:09 pm only on big braking.??
It would appear so, but not on command. ie I cant seem to make it happen at will :|
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

Re: WTF Brake/Front end issue

Post by Wreckless Rat »

They are sintered HH pads, yes.
User avatar
Skub
Posts: 12124
Joined: Mon Mar 16, 2020 5:32 pm
Location: Norn Iron
Has thanked: 9778 times
Been thanked: 10081 times

Re: WTF Brake/Front end issue

Post by Skub »

I had a similar thing on my ten a while back. I took out the pads and gave them a good rub with rough emery and all was fine.

All I could put it down to was,the pads had picked up something they didn't like and they were a bit glazed.

Worth a try before you go looking for anything more labour intensive!
"Be kind to past versions of yourself that didn't know what you know now."
Walt Whitman
https://soundcloud.com/skub1955
User avatar
Dodgy69
Posts: 5424
Joined: Mon Mar 16, 2020 6:36 pm
Location: Shrewsbury
Has thanked: 1741 times
Been thanked: 2065 times

Re: WTF Brake/Front end issue

Post by Dodgy69 »

Coming off what [mention]inewham[/mention] said, I read once, following heavy front braking and coming to a stop, don't keep front brake on, can leave itself on disc. 🤷‍♂️
Yamaha rocket 3
Bigjawa
Posts: 1921
Joined: Mon Jun 01, 2020 10:54 pm
Location: Ballymena Co. Antrim
Has thanked: 219 times
Been thanked: 872 times

Re: WTF Brake/Front end issue

Post by Bigjawa »

Sintered pads have the same material as rally paddle clutches, they leave bits of the material on the flywheel a lot. I much prefer organic pads for road use.

Wouldn't have been a bumpy road knocking the pads back.
"Does this bus go to the Titanic?"

"No missus, It's a submarine you need....."
Mr. Dazzle
Posts: 13870
Joined: Mon Mar 16, 2020 7:57 pm
Location: Milton Keynes
Has thanked: 2545 times
Been thanked: 6202 times

Re: WTF Brake/Front end issue

Post by Mr. Dazzle »

My car does this too, badly enough that it's been to the dealer several times to no avail.

You can feel gently "thrumming" if you graze the pedal, nothing under medium braking then shuddering under harder braking.

It only seems to do it on brand new or nearly dead pads/discs. It seems weird that the problem sticks with the car rather than going when you change pads etc.

Just by coincidence I was doing work with a surrwy based supercar manufacturer when this problem first cropped up, one of their chassis guys suggested it was an alignment or stiffness (i.e. shot bushes) issue. Have you put your callipers etc. back on straight?
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

Re: WTF Brake/Front end issue

Post by Wreckless Rat »

I’m going to strip them today and looksee

Thanks for the replies
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

Re: WTF Brake/Front end issue

Post by Wreckless Rat »

Well I found the issue, but it's too embarrassing to admit..... Therefore let's put it down to "road fairies" :shifty:
User avatar
KungFooBob
Posts: 14084
Joined: Sat Mar 14, 2020 1:04 pm
Location: The content of this post is not AI generated.
Has thanked: 537 times
Been thanked: 7475 times

Re: WTF Brake/Front end issue

Post by KungFooBob »

One of the pads in the wrong way round :)

I've done it on a car, but never a bike.
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

Re: WTF Brake/Front end issue

Post by Wreckless Rat »

Worse.... :shhh:

I can't believe I didn't even notice when I stopped 3 times to look :oops: :oops: :oops:
User avatar
Horse
Posts: 11477
Joined: Sun Mar 15, 2020 11:30 am
Location: Always sunny southern England
Has thanked: 6127 times
Been thanked: 5038 times

Re: WTF Brake/Front end issue

Post by Horse »

Wreckless Rat wrote: Sun Aug 09, 2020 11:23 am Well I found the issue, but it's too embarrassing to admit..... Therefore let's put it down to "road fairies" :shifty:
Well, I'll admit to one, then you can cough to yours?

My 'lack of braking' issue was the result of taking the pads out to clean them, etc.

Apparently they work better if all four, not just three, have the pads installed with friction material against the disc :think: :oops: :cry: :wtf: :roll: :clap: :wave:

Your go ;)
Even bland can be a type of character :wave:
User avatar
Horse
Posts: 11477
Joined: Sun Mar 15, 2020 11:30 am
Location: Always sunny southern England
Has thanked: 6127 times
Been thanked: 5038 times

Re: WTF Brake/Front end issue

Post by Horse »

wow - I'm not the only eejit!
Even bland can be a type of character :wave:
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

Re: WTF Brake/Front end issue

Post by Wreckless Rat »

Let's just say... calipers are normally held on with TWO bolts........ :shock:

I have ordered a new set... clearly one is somewhere on the private road system..... :wtf:
User avatar
KungFooBob
Posts: 14084
Joined: Sat Mar 14, 2020 1:04 pm
Location: The content of this post is not AI generated.
Has thanked: 537 times
Been thanked: 7475 times

Re: WTF Brake/Front end issue

Post by KungFooBob »

I suppose they are radial callipers, so not as easy to spot as on traditional callipers.
Wreckless Rat
Posts: 1253
Joined: Thu Jul 30, 2020 11:25 am
Has thanked: 666 times
Been thanked: 704 times

Re: WTF Brake/Front end issue

Post by Wreckless Rat »

KungFooBob wrote: Sun Aug 09, 2020 11:43 am I suppose they are radial callipers, so not as easy to spot as on traditional callipers.
Yeah, that's my excuse.... :thumbup: