Antidiving unit gone

[mick the knife]

Who has the defintive answer??

JAWS !!!!
The only man we listen to with Birdy advice.

 

[R2B2]

Are VFR and Bird systems different?

Tbh I don't know because I've never looked at the VFR system. I wouldn't have thought they would make it different, but it could be I suppose. What I can say is it would not need to be different on the rear caliper based on it being a lighter bike [ie - one rear piston operated by the front brake instead of two re locking up the rear wheel] because the PCV (proportional control valve) does the job of preventing rear wheel lock-up.

 

[morphgarth]

Quote - Ah well, as I said, Know Your Brakes.


Trouble is, no-one so far has demonstrated that they do, at least not definitively!

 

[R2B2]

Trouble is, no-one so far has demonstrated that they do, at least not definitively!

:dunno: :dunno: Sometimes you have to trust what somebody say sometimes, difficult for a copper I know, but necessary on occasions!

I've got a fairly good handle on how it works. I can give you chapter and verse if you want but it would take me an hour to type it all!

 

[morphgarth]

:dunno: :dunno: Sometimes you have to trust what somebody say sometimes, difficult for a copper I know, but necessary on occasions!

I've got a fairly good handle on how it works. I can give you chapter and verse if you want but it would take me an hour to type it all!

R2 I want to believe you I really do, but it's hard for me after all these years, first I need to caution you, then ask you to go through it a few times whilst I try to exploit any inconsistencies, then I may need to stand up, bang the desk and call you a slag a few times before I'm finally convinced!!!!c7u8

 

[silverfox.xx]

but it's hard for me after all these years,

I'm pleased that brakes do it for you, really I am...:-0)

 

[solorider]

yes R2B2 is correct as explained on here http://world.honda.com/motorcycle-technology/brake/p5.html

 

[Jaws]

Quote - Ah well, as I said, Know Your Brakes.


Trouble is, no-one so far has demonstrated that they do, at least not definitively!

Only repeatedly.......

Having explained all this about .. ooohhh.. well lots of times, I really cannot bring myself to do it again..
Two possibles

a) You could do a search for the various other posts over the past 9 years
b) You could actually spend a few bob and buy a manual... but then,,,, nah ... that aint gonna happen is it ! LOL !!

 

[Duck n Dive]

" call you a slag a few times" before I'm finally convinced!!!!

The truth will out :-0)

 

[morphgarth]

Only repeatedly.......

Having explained all this about .. ooohhh.. well lots of times, I really cannot bring myself to do it again..
Two possibles

a) You could do a search for the various other posts over the past 9 years
b) You could actually spend a few bob and buy a manual... but then,,,, nah ... that aint gonna happen is it ! LOL !!

A) I have John and they're contradictory
B) I have but it's in the garage and it's cold out there and full of spiders!


And, Silverfox, you are one sick puppy!!!:-0)

 

[Jaws]

Its like this.. you can either read all the squit and take a balanced view ( !! ), or you could read the ones from 1200 Pete and myself..
Afteral, as far as I know we are the only two who actually earn(ed in Petes case) a living working exclusively on birds

 

[morphgarth]

To be honest John I didn't even care that much until my kids started playing on the Ninetendo Wii, I got bored and fancied an argument. This seemed an ideal opportunity. Where's Barrie when you need him!??

 

[soloXX]

You guys better stop the argument, and tell me how to fix the damn thing, the thread has gone astray!!! %$fan

 

[Jaws]

LOL !! I am only being arsy cos I was bored shitless too !
Perhaps we can start up a new forum.. The Bores..
I reckon it should catch on a treat..

 

[morphgarth]

NO WE CAN'T (there you go!!!):neenaw:

 

[R2B2]

You guys better stop the argument, and tell me how to fix the damn thing, the thread has gone astray!!

Good point. Lets get it back on track.

We first need to know what it is/is not doing. Did your man say what was wrong with it, other than 'it's gone'? Try to get us some more info.

Here's a couple of scenario's.....

If it's seized up then you need to take it off the bike and get it apart. When you take the rubber dust cover off the bottom end you will then need some internal circlip pliers to get the circlip out. You'll have to push the pushrod in [to compress the spring] so as to remove the pressure from the circlip. When you nave the circlip out you can then draw the piston assembly out of the unit. Do it on a table or similar so you can see which order the parts come out for reassembly. Note which way the round the spring is as it comes out!

If it was seized then check the bore of the cylinder for scoring and surface damage. If the bore is in poor condition you'll have to replace the whole unit.

If it's only leaking (which it doesn't look like from your pictures) and the bore is in reasonably condition, then you'll probably get away with fitting a new seal to the bottom of the piston.

Whatever you do, keep all the internal parts clean and only use new brake fluid to aid assembly - don't use any petroleum based lubricants whatsoever.

When you fefit to the bike use new copper washers on the brake hose banjo's when you put them back on the master cyl.

It shouldn't be that difficult to find a used secondary master cyl as all those folk who have de-linked will have one surplus to requirements.

Shout if you need more help.

hth

 

[Artemis]

R2 I want to believe you I really do, but it's hard for me after all these years, first I need to caution you, then ask you to go through it a few times whilst I try to exploit any inconsistencies, then I may need to stand up, bang the desk and call you a slag a few times before I'm finally convinced!!!!c7u8

Morph, you forgot to detail the caution, i.e. Anything you do say will be taken down in pencil and altereded beyond all recognition when I get back to the station :yo:.

 

[Jaws]

Nooo.. see the basic problem is that the person diagnosed something wrong that does not even exist.. so first off we must establish if there is even a problem !
Ok, a quick and dirty method of checking if the 2ndry master cylinder is functioning...

Go for a ride along a nice straight bit of road.. make it a long one thereby giving the rear disk plenty of time to cool right down from any previous brake usage.
Then apply ONLY the front brake ..
Stop completely using front brake only. Get off the bike, remove a glove and feel the rear brake disk ( careful it may be hot ! )
Even if it is only warm then the 2ndry master cylinder IS working ok.
Once that is established get the bike up on the centre stand and make sure the rear wheel turns easily and nothing is binding.
If all is well then you have no problem at all with the system.. Only with choice of mechanic !

 

[soloXX]

Looks like it's seized up indeed. The rod at the bottom of the unit is loose and apparently touches the walls of the unit when moved side to side, creating sort of a metallic noise. The way the rubber dust cover look, confirms that the thing is seized up.
Jaws, I will examine the unit the way you have suggested later on, as it's time to hug the pillow
Thank you guys!

 

[morphgarth]

Glad you didn't say "bite the pillow!"


Jaws, good practical check that, nice one.