Caliper Compatability

[Carpy]

Hi Guys & Gals


Does anybody have a definitive answer as to whether a rear brake caliper off a 2001 R1 is the same as the rear brake caliper off a FZS1000. I looked on a parts site and the R1 part number is 5JJ 2580W 00 00, and the FZS1000 part number is 5LV 2580 00. I am wondering if the first number/letter configuration just relates to the actual bike and the longer number is the actual part reference.


Cheers peeps


Carpy

[unfazed]

R1 one will not fit.Totally different mounting

[Carpy]

Thanks for reply
Guess it's back to the drawing board
Just out of curiosity, when you say totally different mounting, what is so different ?


Cheers
Carpy

[Jules-C]

The distance between the mounting bolts is different

[kebab19]

Agreed, won't fit.
You need an FZS1000 or certain XJR1300 blue-spot / silver-spot rear calipers to get the larger 41mm pistons and therefore better braking performance.  Pity as there's quite a few early R1 blue-spot rears on ebay, someone could easily fabricate an adapter...

[unfazed]

Piston on the original FZS600 caliper and the FZS1000 are the same size which is why the master cylinders are the same on both bikes. The only problem with the original FZS600 caliper was poor drainage due to small drain holes which were easily blocked by road crud. This allowed water(especially salt laden water) to collect within the caliper around the pads and corrode everything within. FZS1000 caliper had open bottom end as the pads are fitted from the bottom, hence less issue with holding water.

[Carpy]

The distance between the mounting bolts is different

Agreed, won't fit.
You need an FZS1000 or certain XJR1300 blue-spot / silver-spot rear calipers to get the larger 41mm pistons and therefore better braking performance.  Pity as there's quite a few early R1 blue-spot rears on ebay, someone could easily fabricate an adapter...

Piston on the original FZS600 caliper and the FZS1000 are the same size which is why the master cylinders are the same on both bikes. The only problem with the original FZS600 caliper was poor drainage due to small drain holes which were easily blocked by road crud. This allowed water(especially salt laden water) to collect within the caliper around the pads and corrode everything within. FZS1000 caliper had open bottom end as the pads are fitted from the bottom, hence less issue with holding water.

Once again Thanks for all replies, quite informative


Carpy

[kebab19]

Piston on the original FZS600 caliper and the FZS1000 are the same size which is why the master cylinders are the same on both bikes.

Sorry but no, the rear brake pistons are not the same size.  Even a quick search on ebay will reveal that the 600's replacement rear brake seals are 38mm diameter whilst the 1000's are actually 43mm diameter.  If they were the same piston size, the replacement seal kits would be advertised as being suitable for both bikes.I can confirm when I had my 600 that there was a substantial difference in braking action when the 1000's rear caliper is fitted instead of the original rear caliper.

[unfazed]

I believe you,  :eek I never had any reason to check it. When I bought my rear caliper way back in 2004, the breaker I bought from said they were the same as I was going to change the master cylinder. He said they had to be the same 41mm piston as they both had the same master cylinder. Never had any reason to check and since I gave away the 600 caliper shortly afterwards I had no way of checking it or any reason to buy seals or pistons

Strange that they same master cylinder (double checked that) for such a size difference in the pistons.

[kebab19]

It is strange: I'm actually wondering if Yamaha used the same rear master cylinder for many of their other bikes around that time (ThunderAce, Thundercat, TRX850, XJR, early R1, R6 etc) and just altered the 'bite' of the rear brake pads to compensate...

[Frosties]

Hi Guys & Gals


Does anybody have a definitive answer as to whether a rear brake caliper off a 2001 R1 is the same as the rear brake caliper off a FZS1000. I looked on a parts site and the R1 part number is 5JJ 2580W 00 00, and the FZS1000 part number is 5LV 2580 00. I am wondering if the first number/letter configuration just relates to the actual bike and the longer number is the actual part reference.


Cheers peeps


Carpy

Do you mind me asking why you feel the need to upgrade this caliper ??

[kebab19]

Do you mind me asking why you feel the need to upgrade this caliper ??

Providing you don't clean out the standard rear caliper as often as forum member Darrsi does  the caliper is quite prone to piston seizure due to it's design. Water, salt & dirt can gather in it, affecting the seals and piston movement. There are some alternative rear brake calipers requiring minimal modification to fit, with the FZS1000 and some XJR1300 calipers being favourites.
The design of these calipers allow moisture / road muck to drain out of them far easier.  As a bonus they also have larger pistons, offering a decent degree of feel activating the back brake and the perception of more precise braking.  Although you can lock the back wheel with the standard rear caliper, the challenges in maintaining them through poor weather and the availability of FZS1000/XJR1300 rear calipers means that these replacement calipers are sought after.