montydog
Guest
Hey Antti that looks fab I will investigate this further....... 
r100gs front brake improvement
- Thread starter Garry H
- Start date
Twin disc using Brembo 4 Pot Calipers a R100R 15mm Master Cyl
modified Right hand Fork Slider on Left Leg and machind hub to centre disc in Caliper, a lot of work but good improvement.
My next project is to fit R100R forks and front wheel to make a supermoto
Regards
Colin
is it a massive improvement? what do you have to do to modify the left slider and is it possible to machine the caliper rather than the hub or was there runout on the hub?
got two discs already and it would be nice to have brakes. i have a 4 pot caliper but didnt change much. seems to lock up easier but that might be the mega slimy roads here at the moment.
is it a massive improvement? what do you have to do to modify the left slider and is it possible to machine the caliper rather than the hub or was there runout on the hub?
Have you pur-chance noticed, you've resurrected a thread thats nearly four years old?
A modified left hand leg IIRC will set you back around £150-180. I reccon they are either a new casting or a cut and shut type affair 'fingers crossed for the former'. Then you need to find another caliper and disc (tough you say you have one) to complete the job.
The down side is the extra unsprung weight from the second set-up. Personally I think it's better to go for the 320mm disc conversion. It could well be that the bigger single disc gives better braking than you'd get from the double
It would be nice to find a more modern caliper to go with it too. Unfortunately almost all modern calipers are designed to fit behind the fork leg and have biased pistons, which means when fitted to the front of a fork leg they are effectively working the wrong way round, there-by reducing the braking efficiency of the caliper.
Val.
PS: What did become of this single disc project???
Thats what I'm looking for
Got any words to go with it? Is it much better? Does the modified 1100 four pot caliper fit? Price? Where from?
Cheers Val
http://www.he-motorradtechnik.de/
Was about £150 - but thanks to the depreciation of the £ it is now a bit more expensive
easy to fit, about an hour - I have fitted it to a couple of Bikes, R80GSs
You may have to have a new brake pipe made - £5 - I did on one Bike but not on the other
Better than the original - but the original is not good
The Modified K1100 16v LHS caliper or R1100 will fit but need a little machining to centre the caliper on the disk
The caliper in the photo is the normal GS caliper
The bigger rotor will reduce the speed of the steering, (slightly of course)
Was about £150 - but thanks to the depreciation of the £ it is now a bit more expensive
easy to fit, about an hour - I have fitted it to a couple of Bikes, R80GSs
You may have to have a new brake pipe made - £5 - I did on one Bike but not on the other
Better than the original - but the original is not good
The Modified K1100 16v LHS caliper or R1100 will fit but need a little machining to centre the caliper on the disk
The caliper in the photo is the normal GS caliper
The bigger rotor will reduce the speed of the steering, (slightly of course)
Last edited:
r100gser
Registered user
try these web sites
try these 259euro
http://www.bmwboxersupplies.com/pro...id/32?osCsid=d82e70eb6e2ff21862b18cfc6fb807ef
or look on this web site 225 euro
http://www.he-motorradtechnik.de/
try these 259euro
http://www.bmwboxersupplies.com/pro...id/32?osCsid=d82e70eb6e2ff21862b18cfc6fb807ef
or look on this web site 225 euro
http://www.he-motorradtechnik.de/
How much better are these compared to a floating disc and the original caliper?
'swot I have on mine: HE 4 pot
Motoren Israel make the bracket and sell the , HE caliper with mount and the disk kit.
HE do not make a bracket for his 4 pot, for the GS... I asked him. He, (HE), does three grades of pads, depending on your needs.
Stops good with plenty of "feel"
John
This is the one that I purchased.
Stainless hose and bit longer brake pipe completed the job.
I think this is the best mod you can do on one of these bikes - I'm very pleased as I now have a brake.
I do not have any figures for the different braking distances for most of the modified set ups...quite a common caliper to use, (outside the UK) is the Nissan caliper.
Obviously braking distances do depend on technique and skill of rider but, the following figures are taken from the German motorcycle magazine Enduro (Edition 3/03).
Braking distance (100km/h to 0) of a R100GS:
1.) stock single disc: 46m
2.) dual discs: 39m
The cheapest mod is to use the 16v K1100 or R1100 Caliper and have it machined, (motorworks used to sell these already machined in the UK)......I am not sure why they stopped.............but the Germans have always been into TUV and cannot, (for the TUV inspection), fit anything that is not TUV approved..............and in the US they are liability mad......there was some talk that if the part was machined as needed and then there was an accident....it could be blamed.........maybe that is why they stopped selling the modified caliper.......but I do not know..........it is only my assumption
Obviously braking distances do depend on technique and skill of rider but, the following figures are taken from the German motorcycle magazine Enduro (Edition 3/03).
Braking distance (100km/h to 0) of a R100GS:
1.) stock single disc: 46m
2.) dual discs: 39m
The cheapest mod is to use the 16v K1100 or R1100 Caliper and have it machined, (motorworks used to sell these already machined in the UK)......I am not sure why they stopped.............but the Germans have always been into TUV and cannot, (for the TUV inspection), fit anything that is not TUV approved..............and in the US they are liability mad......there was some talk that if the part was machined as needed and then there was an accident....it could be blamed.........maybe that is why they stopped selling the modified caliper.......but I do not know..........it is only my assumption
'swot I have on mine: HE 4 pot
Motoren Israel make the bracket and sell the , HE caliper with mount and the disk kit.
HE do not make a bracket for his 4 pot, for the GS... I asked him. He, (HE), does three grades of pads, depending on your needs.
Stops good with plenty of "feel"
John
Hows the brake feel? does it snap on or feel slightly wooden?
Your caliper looks similar to the ones fitted to the later 1150 & 1200s. My thoughts here are that the caliper is fitted the wrong way round
These calipers are designed to be fitted to the back of the leg. So when fitted to the front they effectively work the wrong way round. This must surly reduce the actual effectiveness. Val.
Hows the brake feel? does it snap on or feel slightly wooden?
Your caliper looks similar to the ones fitted to the later 1150 & 1200s. My thoughts here are that the caliper is fitted the wrong way round
Val.
Val.
Ive found the standard caliper shown in post #23 to be plenty good enough. Try it first and if your as happy as me you will be saving 229 €/£.
I bought the pads from HE as well - can't remember which ones but got the best performing ones.
i think the HE kit with standard caliper is a pretty good balance. if you had much more braking power on one disc, it would twist the forks even more than the HE setup does, which is just about acceptable.
it's cheapish, simple, easy to fit, and takes stock bmw/brembo pads.
it's cheapish, simple, easy to fit, and takes stock bmw/brembo pads.
We still have the stock caliper as well as the modified 1100 caliper thats currently fitted, so plan to go this route at least for now.
Are you concerned about the twisting forks? Perhaps the brace needs beefing up some?
Val.
i am unconcerned as i sold my airhead a little while back
long spindly forks, a thin sheet steel fork brace held on by 4 x M6 machine screws , with one half decent disc brake will inevitably twist the forks under heavy breaking. even the stock set up will do it to some extent if you pull hard enough.
an unpleasant characteristic, but the bike seemed to plow straight on regardless of where the wheel was pointing in my experience. i think the narrow tyre was losing it's grip on reality by then too
i think the HE conversion is an acceptable compromise.
It feels good to me... just like a normal brake.
I think the only thing that might make it the wrong way round, is that the "leading" pistons are the larger of the two sizes. A very small difference, I think on a road bike. However, I think you may be confusing the caliper position with the effect it has on the fork/suspension rather than efficiency of the brake.
Ken Harrison always used to say his 6 pot callipers with 6 separate pads were better than a 6 pot with 2 pads because there were more leading edges diving into the disc. I know that applies to drums, but disc's...
I fitted the San Jose fork brace with it as well
John
an unpleasant characteristic, but the bike seemed to plow straight on regardless of where the wheel was pointing in my experience. i think the narrow tyre was losing it's grip on reality by then too
i think the HE conversion is an acceptable compromise.
Agree this
Beemerboff
Registered user
I have a 93 GS with the floating disk , and finding and fitting HH pads made a decent improvement for a small additional outlay over replacing with stock.
However , I paid around $28- to HPM for a nicely made adapter to take the six pot Tokico caliper found on a few turn of the century Kawasukis, and cheap and easy to find.
HPM is a vendor on the Adventure Riders forum.
With a set of EBC HH 102 pads in the new caliper there is a nice step up from the twin pot Brembo, for a modest outlay.
For around $100- I have a brake which has no trouble locking the tire, and I dont need any more than that.
However , I paid around $28- to HPM for a nicely made adapter to take the six pot Tokico caliper found on a few turn of the century Kawasukis, and cheap and easy to find.
HPM is a vendor on the Adventure Riders forum.
With a set of EBC HH 102 pads in the new caliper there is a nice step up from the twin pot Brembo, for a modest outlay.
For around $100- I have a brake which has no trouble locking the tire, and I dont need any more than that.
Similar threads
