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Discussion Starter #1
The cast iron rotors are going to have to wait until next Winter's mod-fest. So I am thinking of upgrading my '01 748/870 brakes with a Brembo GP Master Cylinder in the meantime. Is this a worthwhile upgrade to make before going the new rotor route? Will the radial master give more breaking power or just improved feel? And for hard street and occasional track day use which one is best, the 19x18 or the 19x20? Any installation tips or do's and dont's?
 
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Re: Brembo GP Radial Brake Master Cylinder??? (Ducaholic)

have you upgraded to 4 pad calipers yet? that would be a much better bang for the buck upgrade if you ask me.
 
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Re: Brembo GP Radial Brake Master Cylinder??? (Ducaholic)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ducaholic »</TD></TR><TR><TD CLASS="quote">The cast iron rotors are going to have to wait until next Winter's mod-fest. So I am thinking of upgrading my '01 748/870 brakes with a Brembo GP Master Cylinder in the meantime. Is this a worthwhile upgrade to make before going the new rotor route? Will the radial master give more breaking power or just improved feel? And for hard street and occasional track day use which one is best, the 19x18 or the 19x20? Any installation tips or do's and dont's?</TD></TR></TABLE>

Improved feel. the 19x20 is a little firmer or harder pull then the 19x18. I have used either one like the 19x20 better for the track.
 
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Discussion Starter #4
Slightly off topic..but..how do you plan on keeping the iron rotors from rusting, living here in N.E.?
I considered them also.
 
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Re: (tricklidz1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tricklidz1 »</TD></TR><TR><TD CLASS="quote">Slightly off topic..but..how do you plan on keeping the iron rotors from rusting, living here in N.E.?
I considered them also.</TD></TR></TABLE>

I'm guessing mink oil or buffalo greeze.

Don't you keep your bike inside or at least under a cover? Being so close to Fall River and New Bedford you should prolly keep it chained to something immobile lest someone take it "tail scratchin".

Mattapoiset...good fishing, bad riding.
 
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Re: (Nick D.)

Slightly off topic..but..how do you plan on keeping the iron rotors from rusting, living here in N.E.?
I considered them also.


I suggest that you ride it
 
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Re: Brembo GP Radial Brake Master Cylinder??? (Ducaholic)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ducaholic »</TD></TR><TR><TD CLASS="quote">The cast iron rotors are going to have to wait until next Winter's mod-fest. So I am thinking of upgrading my '01 748/870 brakes with a Brembo GP Master Cylinder in the meantime. Is this a worthwhile upgrade to make before going the new rotor route? Will the radial master give more breaking power or just improved feel? And for hard street and occasional track day use which one is best, the 19x18 or the 19x20? Any installation tips or do's and dont's?</TD></TR></TABLE>

As long as you don't have the old-style round-hole "swiss cheese" rotors, you'll get the most bang for the buck with the Brembo GP master, in my opinion. Completely changes the feel of the system, particularly if you go to the 19x20 version, as Alex mentioned. FWIW, I've ridden back-to-back sessions on the track with Brembo 2-pads and Brembo 4-pads, and -- to me at least -- there is very little difference between the two. The only thing I could quantitatively feel is slightly less caliper flex under extremely hard braking. And this is on the track. On the street and highly doubt anyone could tell the difference in a "blind taste test."

As for the issue with the cast iron rotors rusting, what do you all do about your car rotors?
One revolution under braking will remove the surface rust that builds up.

BTW, I have a pair of Brembo cast iron rotors for sale, as well as a pair of Brake Tech Axis ductile iron rotors (less unsightly rust!). http://www.woundedduc.com
 
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Re: Brembo GP Radial Brake Master Cylinder??? (Wounded Duc)

woundedduc so you cant really tell much of a difference between the 4 pads and the twin pin calipers?

with what set up? Brembo master 19-20 and what rotors? ferodo or brembo?

Im going to do the change on my 98 748 and like you said it has the old cheese grader rotors.

Just wondering if I should drop $1400 for the 4pads w/ferodo rotors/lines and gp master.

Thanks
 
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Re: Brembo GP Radial Brake Master Cylinder??? (brettmess24)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brettmess24 »</TD></TR><TR><TD CLASS="quote">woundedduc so you cant really tell much of a difference between the 4 pads and the twin pin calipers?

with what set up? Brembo master 19-20 and what rotors? ferodo or brembo?

Im going to do the change on my 98 748 and like you said it has the old cheese grader rotors.

Just wondering if I should drop $1400 for the 4pads w/ferodo rotors/lines and gp master.

Thanks</TD></TR></TABLE>

My old 996 racebike with Brembo cast-iron rotors, Ferodo 911* pads, stainless lines, Brembo GP 19x20 MC. 2-pad, 2-pin, 65mm mount Brembo calipers. Had a 998 with identical set-up except with the 4-pad calipers.

In my opinion, if I had your set-up the first thing I would do is upgrade to stainless lines, then ditch the swiss cheese rotors -- they warp in strong sunlight.
Upgrading to the newer style semi-floating stainless Brembos found on newer 748s or 996s would be a good step, or go all the way and get a set of Brembo cast iron floaters or Brake Tech Axis ductile iron floaters. Then go for the Brembo GP MC. Then I'd look for other stuff to spend your money on.
You just won't get the bang for the buck out of the four-pad rotors -- not to mention you'll have to spend additional $$ for a set of adapters to fit the 65mm 4-pads to your 40mm forks.
 
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Discussion Starter #10
I have a 900 ss with 4 pad calipers and an 888 with GP billet calipers and the 900 stops much harder even though the 888 weighs 30 lbs less. Both have full floaters and radial masters. The downside of the conversion is the calipers are a little heavier, plus the brackets, plus another set of substantial bolts(of different pitch, by the way) but I would do it again. Huge difference in my set up. Oh yea, the four pads themselves are not cheap to replace but will wear evenly. You will need different lines that are not easy to find. Get rid of the swiss cheese rotors first. Mine warped in the shade.
 
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Re: Brembo GP Radial Brake Master Cylinder??? (Wounded Duc)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wounded Duc »</TD></TR><TR><TD CLASS="quote"> FWIW, I've ridden back-to-back sessions on the track with Brembo 2-pads and Brembo 4-pads, and -- to me at least -- there is very little difference between the two. </TD></TR></TABLE>

I find that odd.

I've had a '95 916 and a '99 996S with the 2-pad calipers, and an '02 998S and Mille R, both with the 4-pads, and both of the 4-pad setups were far better than the 2-pads.

I've ridden all but the 998 on the track, and it applies on the street as well as the track. To me, the difference is night and day...

 
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Re: Brembo GP Radial Brake Master Cylinder??? (AZ Scott)

ditto, my monster with 2-pads require a firm 3 finger squeeze to get the same as my 748r 4-pads with 2 fingers. after the radial master upgrade, 1 firm finger is all i need on the street. for stopping power, the 2 to 4 pad upgrade was definitely much more noticable than the radial master. the radial masters just gave the system a better overall feel. that's my story and i'm stickin' to it.
 
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Re: Brembo GP Radial Brake Master Cylinder??? (slowpoke)

I already have the frentubo kevlar lines.
I did make a difference but Im looking for more and the adapters for 65mm are only $150.

so my conclusion is to buy the twin pin, a friend has a set for sale, and new iron full floater (axis) with a gp master cylinder


Good Idea?



Modified by brettmess24 at 10:35 AM 2/11/2005
 
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