T150 double front discs

Hi All.
All the stuff, calipers and master cylinder are stock (left caliper in rotates down).
Hoses are two from calipers in one to the master cylinder and dont leak.
The seals of the master cylinder and calipers are new.
The oil comes out regularly from the two bleedes but the lever does not brake and touchs the handlebar.
What i must to fo?
Thank yo very much for your precious advices.
Piero

What i must to fo?

Click to expand...

Send It To ME ! . :twisted:

Sounds like the STOCK mastercylinders stock ; and half the area required .

TRY connecting JUST ONE Caliper , to see if it then does the berries .

If this works you need two mastercylinders :shock: :? or ONE with TWICE ( almost * ) the bore / piston face area .

* having a M/Cyl that gives ' a bit of travel ' to the lever would likely get a good progressive feel to the brake .
anyway , for the moment , you could connect your m C to Eack caliper in turn , to know that there at home .

Being Italian you could get a good Italian mastercylinder of a Ducati , Laverda etc etc rather than a cheap tinny jap one . :mrgreen:

pierodn said:

All the stuff, calipers and master cylinder are stock (left caliper in rotates down).
Hoses are two from calipers in one to the master cylinder and dont leak.
The seals of the master cylinder and calipers are new.
The oil comes out regularly from the two bleedes but the lever does not brake and touchs the handlebar.
What i must to fo?

Click to expand...

It's almost certain you have not got all the air out of the system.

Is the caliper on the right a modified left hand caliper with a repositioned bleed nipple or is it just an unmodified left hand caliper, in which case it will not be possible to bleed the air out of it unless it is removed and rotated so the bleeding is done with the bleed nipple at the top.

Matt Spencer said:

Sounds like the STOCK mastercylinders stock ; and half the area required .

If this works you need two mastercylinders :shock: :? or ONE with TWICE ( almost * ) the bore / piston face area .

Click to expand...

The standard 5/8" Triumph master cylinder has more than enough area to cope with two (twin piston) calipers, as the Triumph disc brake also suffers from the same basic problem as the Norton brake in that the 5/8" master cylinder is too big for a single caliper.

http://www.vintagebrake.com/mastercylinder.htm

I have twin discs/calipers with a standard 5/8" master cylinder on my T160 and it works extremely well and without excessive lever travel.

Hi Les,
Thank you.
I hoped in your answer!
Yes, i have on the left side a right caliper with bleed niples under.
If i mean i need to bleed the air at first with the calipers bleed noples both upper side.
Can i after put in place the left caliper on the left side with the niple down?
Ciao
Piero

pierodn said:

Yes, i have on the left side a right caliper with bleed niples under.


If i mean i need to bleed the air at first with the calipers bleed noples both upper side.

Click to expand...

Hopefully, you meant "on the RIGHT side" you have "a standard unmodified LEFT caliper" in which case the bleed nipple of the RIGHT caliper will be at the bottom, which means that any air in the caliper will be trapped and cannot be bled out unless the caliper is removed and inverted and bled with the nipple uppermost (and with a suitable piece of wood inserted between the pads).

pierodn said:

If i mean i need to bleed the air at first with the calipers bleed noples both upper side.
Can i after put in place the left caliper on the left side with the niple down?

Click to expand...

Yes, once you have successfully bled all the air out of the system, the right hand caliper can be refitted to the fork leg.

As I mentioned previously, it is possible to add a second bleed nipple to the right hand caliper (see photo) so it can then be bled in situ.

Hi Les
Thank you again.
Sorry, yes, two stock left calipers, one on the right side with
the bleed niples to the bottom.
I will try to do it as you said.
Ciao
Piero

Dear Les,
Nothing to do.
I "inverted and bled with the nipple uppermost (and with a suitable piece of wood inserted between the pads)"; the oil comes out both the nipples but the lever never tight, always against the handlebar.
The pump seals are new; may be needs a new kit?
What i must to do?
Do not seems blow air from nipples, only oil.
Thank you.
Piero

pierodn said:

"inverted and bled with the nipple uppermost (and with a suitable piece of wood inserted between the pads)"; the oil comes out both the nipples but the lever never tight, always against the handlebar.
The pump seals are new; may be needs a new kit?
What i must to do?

Click to expand...

I could be any or all of the following things, either there is still some air trapped in the system, faulty master cylinder, or the master cylinder is not screwed into the housing the correct number of turns?

Hi Les, thank you.
I can replace all the seals into the pump.
But what is the way to have the correct turns of the pump screwed into the housing?
Ciao
Piero

pierodn said:

But what is the way to have the correct turns of the pump screwed into the housing?

Click to expand...

The procedure is in the Lockheed brake manual: http://www.classicbike.biz/Triumph/Main ... Norton.pdf

Piero, you could try bleeding the system backwards using a syringe filled with brake fluid and small hose(connects bleeder and syringe tip). Sometimes this works to move the trapped air out.
You will need to put a bit of telfon plumbers tape on the bleeder threads so that they do not leak when the bleeder is open and you apply pressure with the syringe.

Glen