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Author Topic: CRF1000 DCT wheel lockup  (Read 9326 times)

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Offline m0lt3n

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Re: CRF1000 DCT wheel lockup
« Reply #220 on: March 30, 2021, 04:01:30 pm »
@BikerJan no this is just an assumption. Relax.

Please tell me what is the assumption with this statement?:

Thus Far we can conclude from our Findings that the Front of the bike, all is within SpecÖ

it is

we still dont know if there was mud on that front and have to assume within spec means there is no heat stains on calipers.


something a simple post crash pic will adress
Dooie visse gaan saam met die stroom...
 
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Offline Captain Zef

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Re: CRF1000 DCT wheel lockup
« Reply #221 on: March 30, 2021, 05:20:56 pm »
@BikerJan no this is just an assumption. Relax.

Please tell me what is the assumption with this statement?:

Thus Far we can conclude from our Findings that the Front of the bike, all is within SpecÖ

Thats not the assumption. This is.....  "the front wheel locked up, whilst everything is within specifications"
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Offline ETS

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Re: CRF1000 DCT wheel lockup
« Reply #222 on: April 07, 2021, 03:23:55 pm »
Nog niks gehoor nie??
If i had to explain you would not understand anyway......
 

Offline Dorsland

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Re: CRF1000 DCT wheel lockup
« Reply #223 on: April 07, 2021, 03:34:44 pm »
Geen nuus is goeie nuus soos hulle sÍ.
'Tis the timeís plague, when madmen lead the blind.

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Offline HAMSTER

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Re: CRF1000 DCT wheel lockup
« Reply #224 on: April 19, 2021, 07:12:07 am »
Just wandering if there has been any feedback :-\
 
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Offline Roxtar

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Re: CRF1000 DCT wheel lockup
« Reply #225 on: April 19, 2021, 02:03:24 pm »
If it was my bike I would be speaking to an attorney for damages and settlement from Honda.... ;)
Long live the Underdog.........
 
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Offline AfricaOffroad

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Re: CRF1000 DCT wheel lockup
« Reply #226 on: April 19, 2021, 03:28:28 pm »
Unless you have expert opinion and proof this failure somehow related to Hondaís flawed engineering, you going to be wasting a lot of money going the legal route. Could be many reasons for this failure none of which are Hondaís  problem.
To mention but a few:
Overfilled brake fluid reservoir
Brake lever getting pushed in by a bent hand guard exacipating the above. Fluid heats up, expands and locks brake.
Any kind of contamination of the brake fluid with some type of particles.
Stone in the front disc locking the wheel, saw this happen with a mountain bike the other day, it wasnít pretty.
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Offline m0lt3n

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Re: CRF1000 DCT wheel lockup
« Reply #227 on: April 19, 2021, 03:36:25 pm »
Unless you have expert opinion and proof this failure somehow related to Hondaís flawed engineering, you going to be wasting a lot of money going the legal route. Could be many reasons for this failure none of which are Hondaís  problem.
To mention but a few:
Overfilled brake fluid reservoir
Brake lever getting pushed in by a bent hand guard exacipating the above. Fluid heats up, expands and locks brake.
Any kind of contamination of the brake fluid with some type of particles.
Stone in the front disc locking the wheel, saw this happen with a mountain bike the other day, it wasnít pretty.


We dont even know if it was mud yet... we know nada
Dooie visse gaan saam met die stroom...
 
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Offline Lord Knormoer

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Re: CRF1000 DCT wheel lockup
« Reply #228 on: April 19, 2021, 05:45:37 pm »
If Honda indeed finds anything wrong they will most probably reach a settlement with the owner which will be accompanied by a non-disclosure agreement.

We will therefore either get no feedback or see a report confirming that there was nothing wrong with the bike.
 

Offline BuRP

Re: CRF1000 DCT wheel lockup
« Reply #229 on: April 19, 2021, 07:10:29 pm »
Overfilled brake fluid reservoir

Pertinently & Patently impossible to cause any other problem than leaking and perhaps then taking some paint off!
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Offline RobC

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Re: CRF1000 DCT wheel lockup
« Reply #230 on: April 19, 2021, 07:15:52 pm »
Overfilled brake fluid reservoir

Pertinently & Patently impossible to cause any other problem than leaking and perhaps then taking some paint off!
and on I new bike highly unlikely... unless the agent cocked up the PDS... :sip:
 

Offline AfricaOffroad

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Re: CRF1000 DCT wheel lockup
« Reply #231 on: April 19, 2021, 08:16:23 pm »
Overfilled brake fluid reservoir

Pertinently & Patently impossible to cause any other problem than leaking and perhaps then taking some paint off!
We will agree to disagree.
Take an already full reservoir, take out old brake pads and fit new thicker units, push the caliper pistons back, thereby compressing the rubber diaphragm in the reservoir , so all expansion ullage is removed. Use brakes, fluid heats up, expands, only place for it to go is into the caliper pistons which move outwards. A bad mechanic can create many situations for which a system was not designed.
« Last Edit: April 19, 2021, 08:17:36 pm by AfricaOffroad »
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Offline AfricaOffroad

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Re: CRF1000 DCT wheel lockup
« Reply #232 on: April 19, 2021, 08:21:45 pm »
If you take out all free play on a brake lever, you create a lock up scenario as the fluid heats up.
Very common problem Iíve seen many times particularly on an off-road bike rear brake foot lever.

Anyway, as I was saying many ways to screw up a braking system...
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Offline AfricaOffroad

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Re: CRF1000 DCT wheel lockup
« Reply #233 on: April 19, 2021, 08:27:33 pm »
Overfilled brake fluid reservoir

Pertinently & Patently impossible to cause any other problem than leaking and perhaps then taking some paint off!

I will agree however that you totally fill the reservoir and then fit an in spec rubber diaphragm, this will always ensure enough ullage that expanding fluid cannot create a hydraulic lock, if other system parameters are in spec.
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Offline BuRP

Re: CRF1000 DCT wheel lockup
« Reply #234 on: April 19, 2021, 10:25:04 pm »
We will agree to disagree.
Take an already full reservoir, take out old brake pads and fit new thicker units, push the caliper pistons back, thereby compressing the rubber diaphragm in the reservoir , so all expansion ullage is removed. Use brakes, fluid heats up, expands, only place for it to go is into the caliper pistons which move outwards. A bad mechanic can create many situations for which a system was not designed.

You forget the air hmm?
As I said absolutely not possible - in practical terms that is, in a lab maaaaaybe... if the reservoir's lid is strong enough to cope with substantial pressure (it isn't) and if there's no air trapped (nigh on impossible to do) and if the rubber gasket is strong enough to resist the pressure (lol, they bulge if you tighten the screws a bit hard) and and....
We disagree  ;)
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Offline AfricaOffroad

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Re: CRF1000 DCT wheel lockup
« Reply #235 on: April 19, 2021, 10:50:39 pm »
I donít follow your air argument?
Air escapes through a small passage between the top of the cap/cover and the rubber diaphragm .
The rubber of the diaphragm acts as a gasket and prevents the fluid from escaping similarity.
Ultimately the reservoir will rupture with excessive pressure build up per the scenario originally described . Whether this caused this particular failure, I cannot say.
It does however prove my original point that inappropriate mechanics could have been the root cause of this brake failure.
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Offline BuRP

Re: CRF1000 DCT wheel lockup
« Reply #236 on: April 20, 2021, 08:14:35 am »
Ah, air: no, I don't mean in the actual hydraulic system (when the compensation bore is closed) but above it.
There's always (really) some in the reservoir above the fluid, i.e under the rubber thingy.
The reservoir is just that, a holder of fluid at around ambient pressure, and is not designed to withstand significant pressure, neither the rubber ballow aka gasket.
But also, as gas is compressible (same like the neoprene) this acts as a spring, hence negating pushed back pistons staying in position, rather progressive too!
Sure, when one would be able to force (wedge) the disc inbetween the new pads the hydraulic pressure would act on the inside of the reservoir, causing it to leak/burst.

Locking discs require a rather high pressure (and I agree with you that the thermal fluid expansion is a gargantuan force, note pls) but this force will easily cause the seal/reservoir to rupture/leak/burst way before such pressure is attained.
But, a rather significant but, there's ABS-valves inbetween caliper & reservoir on this bike, making staggeringly high pressures a real possibility!
If I'd had to wager a guess for this mishap then my monies would be on or around the ABS circuitry, but my knowledge on this is limited hence I won't  ;)
« Last Edit: April 20, 2021, 08:18:08 am by BuRP »
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Offline BuRP

Re: CRF1000 DCT wheel lockup
« Reply #237 on: April 20, 2021, 08:39:18 am »
If you take out all free play on a brake lever, you create a lock up scenario as the fluid heats up.
Very common problem Iíve seen many times particularly on an off-road bike rear brake foot lever.

Yes, I agree, had this happen to me..... are you pointing a finger here?  :P
I lowered my brake pedal and took the free play out - too much duh, I'd juuuust closed off the compensation bore  :-[
I came to a full stop only some 100m from my house, and had to take out the toolkit to get home again - on a visibly brandnew bike: "Oh, hallo Buurman!"  ;D

However, that's pressure in the hydraulic system, not in the reservoir!
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Offline 2StrokeDan

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Re: CRF1000 DCT wheel lockup
« Reply #238 on: April 20, 2021, 04:26:16 pm »
Het die bike se wiel nou al losgekom?
 
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Offline Dorsland

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Re: CRF1000 DCT wheel lockup
« Reply #239 on: April 20, 2021, 05:07:02 pm »
Nog nie.  Paar ouens moet eers nog hulle moere klaar strip hier.
'Tis the timeís plague, when madmen lead the blind.

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