Gen 1 master cylinder with 32mm piston calipers

[Gumpert]

Hello all


I recently bought a 2005 gen 1 and really want to upgrade the brakes.

I’ve been looking at the HEL V1 calipers which I believe have 32mm pistons.


The question I have is will the stock master cylinder pump enough fluid to the calipers for it to be a worth while upgrade?

I don’t want to use the radial master cylinder as I wouldn’t want it to make contact with the speedo cluster.


Does anyone have any advice on the subject?


Cheers

 

[Bumblebee]

Welcome.....

There are post after post on this very subject.......and lots of opinions.......

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In almost each and every thread, the mention of upgrading the master cylinder is the number one upgrade over anything else.

You can pick up Gen 2 Brembo calipers that are pretty decent, change out the lines to a good aftermarket steel set, put on a set of EBC HH Sintered Extreme Pro pads and find a Brembo master Cylinder from a mid 2000's R1 and you are GTG.......

Change out the rear pads and lines and you are GTG there too....

For a little over a grand, you can get brakes that will give you one finger stopping....

 

[sixpack577]

You will need a better mc to see any real benefit from those calipers, and you can add a radial mc that and clear the inner windshield.

 

[Bumblebee]

You will need a better mc to see any real benefit from those calipers, and you can add a radial mc that and clear the inner windshield.

We both forgot to add the "Frank" (BerlinGermany) part and ensure the calipers get a detailed cleaning

 

[SSGT_B]

Flush brake system, deep clean calipers, replace pads, change lines to SS, revisit braking options. RCS19 MC will do wonders

 

[Kiwi Rider]

Flush brake system, deep clean calipers, replace pads, change lines to SS, revisit braking options. RCS19 MC will do wonders

This is true, I left my OEM calipers on but 'deep cleaned the calipers' and added stainless hoses and a 2009 GSXR1000 radial m/cylinder.... it transformed my brakes, the lever has instant pressure at the m/c, no more half way to the bars any more.
Very firm lever feel and great bite from new aftermarket rotors and new EBC HH sintered pads.
Total cost was $500.

 

[Gumpert]

This is true, I left my OEM calipers on but 'deep cleaned the calipers' and added stainless hoses and a 2009 GSXR1000 radial m/cylinder.... it transformed my brakes, the lever has instant pressure at the m/c, no more half way to the bars any more.
Very firm lever feel and great bite from new aftermarket rotors and new EBC HH sintered pads.
Total cost was $500.

Does that master cylinder make contact with the tacho ? That’s my worry with the rcs19

 

[SSGT_B]

Does that master cylinder make contact with the tacho ? That’s my worry with the rcs19

Im confused about the question. It fits as the stock one does. Only diference is that you will need to mount the fluid resovoir. There are many options and ways to do it. A bunch of us here ran or still run those on their Busa's. Hell Im about to put one on my Harley

 

[Gumpert]

Im confused about the question. It fits as the stock one does. Only diference is that you will need to mount the fluid resovoir. There are many options and ways to do it. A bunch of us here ran or still run those on their Busa's. Hell Im about to put one on my Harley

I’ve been reading when the steering is at full lock to the left the Brembo RCS19 makes contact with the clocks so I’d rather avoid that MC. Do you have that problem with the r1 MC ?

 

[Bumblebee]

I’ve been reading when the steering is at full lock to the left the Brembo RCS19 makes contact with the clocks so I’d rather avoid that MC. Do you have that problem with the r1 MC ?

I have an R1 Brembo MC with zero issues at all......as the reservoir is a separate item, it can be moved around to ensure it doesn't hit anything.....

This mod has been done to many Hayabusas over the years.....

This is why it is such a great platform, almost anything that can be done.....has been done.....

 

[Kiwi Rider]

Does that master cylinder make contact with the tacho ? That’s my worry with the rcs19

I’m running Renthal bars mounted on an aftermarket top yoke with low risers on my Gen 1 and there’s no clearance problems with that set up ….can’t say for sure if it clears on a standard handlebar arrangement.
Here’s what my set up looks like..

 

[Vanishing Point]

NO need to fit the BIG Brembo reservoir , i use on 3 MC / front brake /clutch and Rear MC ,the tiny reservoirs
I call them PAD Indicators

All parts fit on ABM Superbikekit and Spiegler 0229 Bar


first picture OLD Brembo RCS 19 Brake MC and RCS 19 !!! Clutch MC , also ABS Light plus on/off switch for track days.

 

[Bagherra]

"Deep clean" calipers?
What does this involve?

 

[GIXERHP]

Here is a link to a Members bike i did years ago, no clearance issues at all.
See the post

Gen1 Brembo upgrade - THANKS GIXERHP | Busa Mods

John did the conversion from stock master cylinders to Brembo for the brake and clutch. The difference is amazing and I would say my gen1 now stops like any modern liter bike (non-abs)! :bowdown: I knew the brake would make a big difference but I was REALLY surprised by the clutch. We were...

www.hayabusa.org

 

[sixpack577]

"Deep clean" calipers?
What does this involve?

Disassembly, clean the baked on brake dust rings off of the pistons(dust and crud build up at the edge of the seals where the pistons sit with the brakes released) replace the seals, and clean out the old fluid.
As even vacuuming out the fluid will usually not get all of it out of the calipers that is behind the pistons, and it will just continue to get more nasty.
Brake fluid becomes caustic, and will eat away at the seals over time too.
Alot of people assume that brake/hydraulic fluid moves around or circulates in the lines, and while that may be true to a small extent, for the most part it just moves back and forth a short diatance in the lines.
Here is an example of brake calipers that I rebuilt(of the many, and this is common), and the fluid in the master cylinder resivor and lines(bleeding at calipers) was clean...but this is what they looked like inside.
In most cases one or more pistons will sieze, and/or the seals leak once they get bad enough.
This is why brake fluid is supposed to be changed every 2 years, as it breaks down and it picks up moisture.
You can watch it get darker in the resivors too as it 'wears out'.

 

[Vanishing Point]

"Deep clean" calipers?
What does this involve?

Take a look on @Berlin Germany , his webpage in google translate and you see the calipers deep clean involved.

 

[Gumpert]

Disassembly, clean the baked on brake dust rings off of the pistons(dust and crud build up at the edge of the seals where the pistons sit with the brakes released) replace the seals, and clean out the old fluid.
As even vacuuming out the fluid will usually not get all of it out of the calipers that is behind the pistons, and it will just continue to get more nasty.
Brake fluid becomes caustic, and will eat away at the seals over time too.
Alot of people assume that brake/hydraulic fluid moves around or circulates in the lines, and while that may be true to a small extent, for the most part it just moves back and forth a short diatance in the lines.
Here is an example of brake calipers that I rebuilt(of the many, and this is common), and the fluid in the master cylinder resivor and lines(bleeding at calipers) was clean...but this is what they looked like inside.
In most cases one or more pistons will sieze, and/or the seals leak once they get bad enough.
This is why brake fluid is supposed to be changed every 2 years, as it breaks down and it picks up moisture.
You can watch it get darker in the resivors too as it 'wears out'.

View attachment 1688651

View attachment 1688652

Nice one sixpack.


Literally going to do this tomorrow, got new seals, pins and just bought a tin of gold paint to freshen them up a bit. Got some SBS sintered pads aswell.

Looking for to having brakes