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soloXX
Guest
Well, that's what a mechanic has told me. Don't know much about it, but it makes a lot of bad noise :violin:
Anyone has one for sale, new or used??
Anyone has one for sale, new or used??
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Welcome to the new B.I.R.D. Forum. Please be sure to read the "New Member / New Registered ? Please Read" thread in the Coffee Shop. This contains some important information. To become a full member ( £5.90 a year ) simply click on your user name near the top on the right I hope you enjoy the new site ................ Jaws ( John )
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soloXX
Guest
That's a thingie above the left brake caliper.
Hope I can replace that without changing the whole fork...
Hope I can replace that without changing the whole fork...
gypsy
MAN on the PAN
thats the PROPORTION CONTROL VALVE controls the combined braking system ie applies the rear brake
never heard of one breaking though?
How has he come to that conclusion?
if its just been for an mot the prat doesnt know how it works i think :-0)
give Jaws a call he will be able to explain it better
never heard of one breaking though?
How has he come to that conclusion?
if its just been for an mot the prat doesnt know how it works i think :-0)
give Jaws a call he will be able to explain it better
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soloXX
Guest
I will make a picture of it later on, don't think it's the part I was talking about.
ericonblackbird
Registered User
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soloXX
Guest
This will make it easier, sorry she isn't the cleanest one around 
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morphgarth
Guest
As Ericonblackbird says, that's the secondary master cylinder, in simple terms, as I understand it, appy your front brake, left caliper grips disc, rotates slightly pushes piston up into secondary mc which applies centre pistons on rear caliper.
Looking at your bike's cleanliness I would imagine it might be worth detaching it from the front left caliper and cleaning it up and trying to free it off if it's seized.
It is NOT an anti dive albeit one might argue that the application of the brakes together has the effect of reducing nose dive in braking.
If you want to see real anti-dive look at a mid 90's GPZ!!!:yo:
Looking at your bike's cleanliness I would imagine it might be worth detaching it from the front left caliper and cleaning it up and trying to free it off if it's seized.
It is NOT an anti dive albeit one might argue that the application of the brakes together has the effect of reducing nose dive in braking.
If you want to see real anti-dive look at a mid 90's GPZ!!!:yo:
Dunno who the hell told you it was an anti dive thing... With the best will in the world I still cannot muster anything better to say about the person than that he is a complete fookin berk..
What ever you do avoid the person like the plague.. He has not got a CLUE what he is talking about and is going to cost you a LOT of money sooner or later.
Oh and they do move about a bit sometimes and you DO get clonks from the front end too ...
What ever you do avoid the person like the plague.. He has not got a CLUE what he is talking about and is going to cost you a LOT of money sooner or later.
Oh and they do move about a bit sometimes and you DO get clonks from the front end too ...
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soloXX
Guest
So basically it's a matter of cleaning it?
That would be a bit of release, if I don't need to search for a new one.
P.S. Sorry if I sound lame, my mechanical skills are virtually zero
That would be a bit of release, if I don't need to search for a new one.
P.S. Sorry if I sound lame, my mechanical skills are virtually zero
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R2B2
Guest
Know your brakes!
Actually fellas, there is a device on the Bird to prevent fork dive. It's the delay valve and is mounted on the right fork leg, above the caliper area, near the top of the front fender.
When you use the front brakes, only the left caliper operates initially. The delay valve delays hydraulic feed to the right caliper until a preset pressure is attained. This staged application of the front calipers helps prevent sudden fork dive.
The left caliper comes on first so that the secondary master cylinder can bring on the two outer pistons on the rear caliper before the right front caliper comes into operation.
Actually fellas, there is a device on the Bird to prevent fork dive. It's the delay valve and is mounted on the right fork leg, above the caliper area, near the top of the front fender.
When you use the front brakes, only the left caliper operates initially. The delay valve delays hydraulic feed to the right caliper until a preset pressure is attained. This staged application of the front calipers helps prevent sudden fork dive.
The left caliper comes on first so that the secondary master cylinder can bring on the two outer pistons on the rear caliper before the right front caliper comes into operation.
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morphgarth
Guest
That's not techincally an anti-dive system though is it R2? It's a system that operates the brakes in a way that a careful and skilled rider should be able to do anyway.
When I think of anti-dive I think of the ones where the application of the brake was directly linked to the operation of the forks themselves, such as AVDS etc.
When I think of anti-dive I think of the ones where the application of the brake was directly linked to the operation of the forks themselves, such as AVDS etc.
silverfox.xx
quocunque jeceris stabit
I think you know it but... the front brake operation (as above) brings on the middle rear brake piston, rear brake operation brings on outer two pistons.. well according to the Honda BB operators manual.R2B2 said:
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morphgarth
Guest
silverfox.xx said:
Silverfox, you're right, as per my original post.
RDB2, as you said.......>>"Know your brakes":neenaw:
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R2B2
Guest
It's odd that you should read that SF cos the front brake does bring on the two outer pistons in the rear caliper, not the centre one.
The centre one is directly coupled to the rear brake pedal.
The centre one is directly coupled to the rear brake pedal.
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R2B2
Guest
It is the only reason this valve is designed into the system - it plays no other role, so I guess Honda would argue that it is.morphgarth said:
It's not possible for any rider to apply one caliper at a time on a twin disc front system, however skilled he is [unless there are double stage master cylinders out there somewhere, but I've never heard of any].
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morphgarth
Guest
No, I meant balancing the front and rear brakes to avoid burying the nose, I too have never heard of one front disc at a time!!
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R2B2
Guest
Hang on a sec.....
I'll get this right in a mo!!
The delay valve does operate the way I described above but in conjunction with the hydraulic supply from the rear master cyl and not the front one, duh!!
I've studied this brake system intently over the years but it's still easy to get it mixed up
I'll get this right in a mo!!
The delay valve does operate the way I described above but in conjunction with the hydraulic supply from the rear master cyl and not the front one, duh!!
I've studied this brake system intently over the years but it's still easy to get it mixed up
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morphgarth
Guest
Useful link and I hereby issue my full and unreserved apoplgy to R2B2 who is spot on!:bow:
http://www.ixxra.org/birdbrakes.htm
http://www.ixxra.org/birdbrakes.htm
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morphgarth
Guest
Although this link for the VFR linked system supports the theory that on applying the front brakes only the center piston on the rear is activiated which is what I thought originally and makes more sense to me. So which is it? Are VFR and Bird systems different? Who has the defintive answer??