Antidiving unit gone

[Pugwash]

Nooo.. see the basic problem is that the person diagnosed something wrong that does not even exist..

Maybe he took it to Taz?
They're the geniuses who had my girlfriend's 125 for a week trying to find a replacement missing spring with no part number, because it didn't exist. :bang:

 

[soloXX]

Another silly question here
Will it be required to bleed the brakes to replace the secondary master cylinder? Did it just a month ago, I'd hate to pay the mechanic for that again, if there's no need to do so.

 

[Jaws]

Well you will certainly have to have the 2ndry circuit done but it should not affect the primary one at all

 

[Demonbane]

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 !

could this be done with the bike on centre stand with engine running and in gear? ,then apply front brake and see if it slows/stalls the bike? (assuming front wheel is on the floor and rear is clear,or is my simple thinking flawed

 

[Centaur]

Not sure DB

but I have a feeling the front wheel has to be turning.

 

[Jaws]

could this be done with the bike on centre stand with engine running and in gear? ,then apply front brake and see if it slows/stalls the bike? (assuming front wheel is on the floor and rear is clear,or is my simple thinking flawed

Bill is right..
The 2ndry master cylinder is activated by the roration of the left hand calliper, caused by applying the front brake whilst going along.

It matters not if the engine is running.. It is not connected to th ebrakes in any way shape or form.

You CAN simply grab hold of the left hand calliper and heave it upwards while someone turns the rear wheel.. but it really does take a considerable effort normally !

 

[gerryc]

For a static test have the engine running and grab a fistful of front brake, engage the clutch and select first gear, take your weight off the seat and stand over the bike whilst weighing down on the bars, proceed to rev the nuts off the bike about 7-9 grand will suffice, now dump the clutch.

Have an assistant watch through the smoke of your rapidly dissappearing rear tyre and check to see if your brake disc is glowing, if this does not happen before your rear tyre goes pop I would hazard a guess that your secondary master cylinder is indeed knackered.

 

[morphgarth]

For a static test have the engine running and grab a fistful of front brake, engage the clutch and select first gear, take your weight off the seat and stand over the bike whilst weighing down on the bars, proceed to rev the nuts off the bike about 7-9 grand will suffice, now dump the clutch.

Have an assistant watch through the smoke of your rapidly dissappearing rear tyre and check to see if your brake disc is glowing, if this does not happen before your rear tyre goes pop I would hazard a guess that your secondary master cylinder is indeed knackered.

Wow!!! Yu musht b a propa mekanoic. Ace!!