Brakes

[Russfjr1]

Hi all, I am in the process of fitting a R1 big bang rear to my FJ. My only concern is how small the rear disc is and only uses a single pot sliding caliper! Will it be ok on the FJ ? Obviously it works on the R1 but it's a race bike that in reality the rear brake possibly is not used to the extent you might use it on heavy road bike. Up front I have a exup usd set up with 6 pot calipers so no problem stopping with them  it's just that tiny rear looks like it should be on a 125  Now I have the ability to machine a bracket to hang a 4 pot Brembo caliper (front caliper from a Ducati Monster) to the rear and use a 245 mm disc in place of the 220 mm but is this going over the top and will the FJ rear master cope with 4 pots?

Any thoughts would be much appreciated

Thanks  Russ

[Urban_Legend]

Hi Russ

With all the stopping power you have on the front of the bike, your rear brake setup should be more than sufficient. As standard the FJ does not have a big rear brake and the calliper is only single spot. Remember only 10-15% of your braking usually comes from the rear (for those of us that use it anyway)

Mark

[Russfjr1]

Hi thanks for the reply, the original brake caliper and disc are just so much more heavy duty than the R1 items.  In most cases if it's a dry sunny day who needs a good rear?  My concern is that here in the UK it's wet more than dry so the need for a good rear brake is utmost. I keep looking at the R1 stuff and ok it's 20 odd years later tech but how does that relate to stopping power?   Russ

[Mark Olson]

Unless you are looking to slide the rear around locking it up all the time , just go with the stock caliper from the R-1 you already have.

A 4 piston brembo would be a bad idea and lock the rear when the weight shifted forward during braking ..

Oh and welcome to the group. 

[Bones]

Depends if you ride solo or 2 up. When I ride solo I hardly touch the rear brake as the front has sufficient power to slow down, however 2 up when slowing down I'll use the rear brake more because it makes the rear squat down and doesn't seem to throw the passenger up against your back as much as using the front brake alone.

The standard rear brake on the FJ works well and will lock the rear wheel easily, but the smaller the disc the harder it will be to lock up, so if you have a non standard wheel with a smaller disc but want good stopping power, maybe try some EBC sintered pads.

[ribbert]

Hi all, I am in the process of fitting a R1 big bang rear to my FJ. My only concern is how small the rear disc is and only uses a single pot sliding caliper! Will it be ok on the FJ ?

Thanks  Russ

Many folks here, myself included, find the standard FJ rear brake too good. Some even going as far as limiting its effectiveness.

I have the small FZR600R / single piston caliper with HH pads and it's more than enough. I was glad to be rid of the touchy original rear brake.

If you're braking in the wet, you can't use much anyway and if you're braking in the dry you don't need much.

Noel

[Russfjr1]

Well thanks to all for your input, for now I think I will go with totally standard R1 rear brake I already have all the matching parts so lets see. If it is not up to it I can always modify it at a later date. Out of interest has anyone tried the set up I am using? Exup 1000 usd forks with the 6 pot calipers 320 mm disc's 17 x 3.5 wheel 120 tyre up front and the R1 big bang rear swinging arm, brake, wheel 17 x 6 and 190 tyre. Sprocket wise up front I have to move it about 4 mm out no problem then move the rear sprocket in I think that's about 6 mm. Just need to make the triangles for the shock, the dog bones I have replaced with a adjustable one I have made with 12 mm rose joints either end. If anyone is interested I will upload some photos of work so far including a heavily modified top fairing with cbr600rr twin headlight!       

[ZOA NOM]

Hi all, I am in the process of fitting a R1 big bang rear to my FJ. My only concern is how small the rear disc is and only uses a single pot sliding caliper! Will it be ok on the FJ ?

Thanks  Russ

Many folks here, myself included, find the standard FJ rear brake too good. Some even going as far as limiting its effectiveness.

I have the small FZR600R / single piston caliper with HH pads and it's more than enough. I was glad to be rid of the touchy original rear brake.

If you're braking in the wet, you can't use much anyway and if you're braking in the dry you don't need much.

Noel

+1, I find the combination of the front brakes and engine braking during downshifts is more than sufficient, especially when enjoying a spirited ride. Only touch the rear brake to remind me it's there once in a while.

[ribbert]

+1, I find the combination of the front brakes and engine braking during downshifts is more than sufficient, especially when enjoying a spirited ride. Only touch the rear brake to remind me it's there once in a while.

Quite right, I don't use the rear to retard speed so much but to settle the bike.

Noel