What master cylinder

[CHUNKATLARGE]

Oh brains trust,,What master cylinder is the go after putting on 4 pot brakes,, after spending all that money on wheels, discs etc, it would be nice to grab a handfull and stop. I read goldline but this is code? how about use the ones off a 99? or something like that,

[wasp1000]

Originally Posted by CHUNKATLARGE

Oh brains trust,,What master cylinder is the go after putting on 4 pot brakes,, after spending all that money on wheels, discs etc, it would be nice to grab a handfull and stop. I read goldline but this is code? how about use the ones off a 99? or something like that,

I stuck with the standard.... Plenty of brakes with the 4P4P + wave rotors...

Greg

[Muschi]

if you use the Brembo P4 30/34 calipers from a supersport,
go with the 16mm master as the supersports.

if you use the Brembo P4 34/34 calipers from a superbike,
go with either a 18 or 19mm master, 1098 Ducatis got a 18mm one.

don't stay with the stock master, that is all wrong, there might be plenty
of stopping power, but modulation of it should be a problem.

[CHUNKATLARGE]

yes that makes perfect sense,
O.K for Wasp, (strong right hand)

[DGJ]

I have these 4P calipers. (image attached)

I've been running stock MCs and while I got plenty of stopping power (I can lock the front wheel no problem, in fact, I did during my last crash), they never felt quite right, and IMO nothing replaces the feel and range of radial MCs, and so as my baby is being put back together I will be putting these on. (image attached)

both stock MCs were broken in pieces during the accident, so why replace with stock, right?

If you can, go for it. But before putting this much brake power on this bike I would strongly recommend stiffening your front suspension considerably.

[Muschi]

the stock sport classic master must be a 13mm or so one,
it is a very bad idea to use that with the P4 34/34 calipers you got.

too much stopping power, no modulation possible, will be
nice riding in the rain etc. for sure, no wonder that you locked
your front wheel and crashed.


at Chunkatlarge: you are thinking in the wrong direction, a small
master cylinder diameter as used by your friend greg will require
less and not more force to operate. His brake will be too sharp
with a small amount of force used at the handlebar.

in the end, it is a matter of piston surface area, between the
caliper pistons and master piston, in mm², as this is a metric universe.

[DGJ]

Originally Posted by Muschi

no wonder that you locked
your front wheel and crashed.

Hey Muschi. just to be more precise, I didn't crash because I locked my wheels due to the wrong MC.... Some old man in 4x4 came out of a driveway onto on coming traffic right in front of me as I was going 60km/h and had 15 meters to stop. So going down was better than hitting his car and in the process I know I locked my wheel... in this situation I don't think a different MC would have changed much, there was just not enough room to stop.

but I'm not arguing, an 18mm radial MC is definitely the way to go.

[Ducatisti23]

Hey CHUNKATLARGE,

Am very curious to hear which way you went with the master cylinder and how the brakes feel now (assuming you have swapped it) as I am also looking to replace mine.

So to summarise.

OEM Sport 1000 Master cylinder is approx. 13mm (according to Muschi)

(Also according to Muschi) If using Brembo P4 34/34 calipers from a superbike, an 18 or 19mm master cylinder is the go, (1098 has a 18mm m/c).

Question: Can somebody tell me what size m/c a 996R or 998 has. I am thinking this m/c would be the most logical replacement for the stock sportclassic one considering the 4p/4p callipers came standard on the 996R and 998.

If anybody has had any experience swapping out the stock m/c at all, can you please post your thoughts.

Thanks.

[Muschi]

i just looked it up in the owners manuals on the ducati homepage,
the 998S has a PSC 15 master, but Brembo P4 34/34 calipers.




now it comes, the sport classic, with her two ? piston 30/32 calipers
has got the PSC 16 master, according to the sport classic owners manual
from 2002.




ducati 1098 has got the PR 18/19 installed, so i was right with a least
one thing.






how many pistons do the sport classics have got per caliper, two ?
one with 30 and the other with 32mm ?

and the supersports, four ?
with two of 30 and two of 32mm per caliper ?




okay, i looked it up, the supersport has got 30/34 calipers,
and not 30/32, as i thought 'til now.
it has the same PSC 16 master as the sport classic, so
keeping the sport classic master while switching to supersport
65mm P4 30/34 calipers is the way to go.

i am sorry.

[wasp1000]

Originally Posted by Muschi

okay, i looked it up, the supersport has got 30/34 calipers,
and not 30/32, as i thought 'til now.
it has the same PSC 16 master as the sport classic, so
keeping the sport classic master while switching to supersport
65mm P4 30/34 calipers is the way to go.

Good research Muschi

As I said: "I stuck with the standard.... Plenty of brakes with the 4P4P + wave rotors..."
You may well get better feel and better modulation with changing out the master cyls, but I dont feel it is required...

Save your money on master cyls and send it to me for some kit's

Greg.