Hello all.
I have been riding a 2001 F4i for just under a year now.
The main purpose for the machine was to ride on track days. I've done that a few times now and I'm not happy with the brakes.
So far I have changed the pads and the brake lines.
I stumbled across the forum that you can use the MC of the 1000rr and the brake calipers of the 954.
While searching I noticed that the repair kit for the 954 is the same as for the 600rr 03-04.
Now I wonder if the brake calipers of the PC37 would also fit.

The forum entry here is from 2008 and I wonder if anyone has had any new experiences in the meantime.


Greetings
Stefan

 

Greetings & Salutations!!

What pads did you get?
Did you get stainless brake-lines? Bleed optimally with DOT-4 fluid?
Changing calipers won't improve braking, especially if they are same caliper.

1. to improve clamping-force, use smaller master-cylinder. This increases leverage-ratio so same squeeze-force at lever, results in higher-clamping force at caliper. Don't just look at models, get actual piston diameter measurements.

2. larger rotors increases backwards torque on wheel for same clamping force from calipers. Look for larger 320mm rotors from Brembo or Galfer. Or Galfer rotors in stock size works well too
https://www.gbrakes.com/shop/moto/st...ront-honda-16/


3. stickier track-oriented pads have more friction. Also fades less than street pads on track. I really like Galfer 1375R ceramic pads for dedicated track bike. Or 1375 HH-sintered pads for combo street/track bike
https://www.sportbiketrackgear.com/g...nt-brake-pads/

 

Cheers mate. Thanks for your time.

I have replaced the pads with TRW MCB703SV (Sinter Performance). I also replaced the lines with steel lines from TRW. Since I live in Germany and the bike is still road legal, I am dependent on parts with ABE.
I have already bled the brakes several times and changed the fluid.
It's less about the grip and more about the spongy feeling when braking.

What makes you think I'm replacing the calipers with the same ones?
The 954's have a different repair kit that doesn't work for the F4i. So the diameter of the pistons doesn't seem to be the same. However, the repair kit works for the calipers of the 600rr, which are again made of one piece and not screwed, which brings a higher stiffness and thus a better pressure point.

Regarding the pump, in this case I exchange an axial one for a radial one, which should already contribute significantly to improving the feeling.
Also I‘ve seen this swap a few times by now. As I said, I'm not interested in braking performance at the moment, but in feeling and dosing.

If I want to install larger discs, I will surely need adapters. Is that even possible with radial calipers?

 

Brake pump doesn't care if it's pushing radial or axial caliper. it's all about leverage ratio of pump diameter vs total caliper pistons diameter.

If you want more solid feel, then you'll want to go in opposite direction with less leverage:

1. larger master cylinder

2. smaller caliper pistons.

 

Now we have talked a lot about theory, but is there anyone who has already had practical experience?

Which brake pump and which caliper can I install?

 

Try one of following pumps:

'03-04 CBR600RR
'02-03 CBR954RR
'00-06 RC51

Use with these calipers if they fit:

'00-01 CBR929RR
'02-03 CBR954RR, may be too little leverage...

 

Based on this, would it not be better to keep the f4i calipers and upgrade to the larger MC from 929 or 954?

 

Yes, do that 1st. Best to change only one part at time.