Pre 82 front calipers

[coops]

Looking for some sort of upgrade on my pre 82 gs750 race bike. currently has gpz 1100 b1 front end with 17" Suzuki bandit wheels.
Twin disc. but the gpz calipers are single pot. Useless.
Would be better with twin opposing pots or lockheeds or brembos or something.
Can use a lathe and mill so attaching shouldn't be a problem provided there is room between the wheel and discs. (for inner pot)
Havnt had a lot of time to research this but basically all jap bikes of this era had crap, absolutetly crap brakes...other options expensive?
I haven't actually found any options. Must be manufactured pre 82 or look the same.
Any help would be appreciated.
Steve.

[Kickaha]

Looking for some sort of upgrade on my pre 82 gs750 race bike. currently has gpz 1100 b1 front end with 17" Suzuki bandit wheels.
Twin disc. but the gpz calipers are single pot. Useless.
Would be better with twin opposing pots or lockheeds or brembos or something.
Can use a lathe and mill so attaching shouldn't be a problem provided there is room between the wheel and discs. (for inner pot)
Havnt had a lot of time to research this but basically all jap bikes of this era had crap, absolutetly crap brakes...other options expensive?
I haven't actually found any options. Must be manufactured pre 82 or look the same.
Any help would be appreciated.
Steve.

You can buy new Brembo new for $272US + freight https://store.bevelheaven.com/Brake-...-Caliper-Pair/, Galger green pads off the same site work really well and I'd go for a 14mm master cylinder with them although some people like the 15mm for a firmer lever

Second hand most of the Brembo I've seen have $100NZ a caliper and you'd want to rebuild them, I bought some new Lockheed/AP but they were about $270NZ each

[sidecar bob]

My pre '82 gsx1100 had brembos on xs1100 discs & at the rate it was being ridden (winning the pre 82 pre 89 all in at cemetery circiut for example) the brakes were fading & seriously over worked & not up to the job at all.
We replaced the discs with 310mm floaters , which are now legal in pre 82 & fitted a brand new pair of Lockheed cp2696 calipers with a 16mm Brembo master cylnder & sintered pads.
The brakes are now the best part of the bike & well worth the investment.
If you want to only go there once, that is the recipie.
Contact these chums for calipers. http://www.racebrakes.co.nz/contact-us.html

[Grumph]

All of the above is correct and good info. As I made the disc carriers, I do have some memory of the space available...not a lot....

A possible - and legal - alternative caliper is the single sided twin pot fitted to some Hondas just in period. Appeared on the CB1100R and on the first of the V4 750's at the same time. They're still in wreckers, not that common but still there, VF750S shaft drivers are probably the most common.
For anyone with a CB750/900 they're a bolt on upgrade.
Pad choice will have a big effect also. On period semi stainless discs I recommend organic pads. Quicker warmup, lower running temps, less fade problems.

[malcy25]

My pre '82 gsx1100 had brembos on xs1100 discs & at the rate it was being ridden (winning the pre 82 pre 89 all in at cemetery circiut for example) the brakes were fading & seriously over worked & not up to the job at all.
We replaced the discs with 310mm floaters , which are now legal in pre 82 & fitted a brand new pair of Lockheed cp2696 calipers with a 16mm Brembo master cylnder & sintered pads.
The brakes are now the best part of the bike & well worth the investment.
If you want to only go there once, that is the recipie.
Contact these chums for calipers. http://www.racebrakes.co.nz/contact-us.html

yehar! I'm doing that calipers with EBC HH on EBC discs and using 15mm as I wanted a bit more mechanical leverage. Common was 5/8" which is 15.88mm. Mine bled up well with 15mm with a nice lever.

Also, drop me a PM with your contact details so I can get you on the Phillip island mailing list as I'm starting to dial that whole project up.

[sidecar bob]

yehar! I'm doing that calipers with EBC HH on EBC discs and using 15mm as I wanted a bit more mechanical leverage. Common was 5/8" which is 15.88mm. Mine bled up well with 15mm with a nice lever.

Also, drop me a PM with your contact details so I can get you on the Phillip island mailing list as I'm starting to dial that whole project up.

Umm yeah. . . my rider is very broken at the moment (not my bike) & has a long road ahead, a victory for him at the moment would be feeding himself. Might just play things by ear for a while

[coops]

All of the above is correct and good info. As I made the disc carriers, I do have some memory of the space available...not a lot....

A possible - and legal - alternative caliper is the single sided twin pot fitted to some Hondas just in period. Appeared on the CB1100R and on the first of the V4 750's at the same time. They're still in wreckers, not that common but still there, VF750S shaft drivers are probably the most common.
For anyone with a CB750/900 they're a bolt on upgrade.
Pad choice will have a big effect also. On period semi stainless discs I recommend organic pads. Quicker warmup, lower running temps, less fade problems.

Thanks for all the replys everyone. and thanks Grumph for the work you did before I got hold of the bike.
I have done a heap of work on it and only ridden it once since I got it. (round the back blocks) Very happy with it. just bad brakes and needs a quick action throttle.
Although I have since stripped brakes and pads and everything had oil all round the place which I think was half the problem. But will still look at upgrading with something. Might do the lockheeds.
See you at the track Grumph, come say hello.
Grumph was that you that introduced yourself too me a few weeks ago at Ruapuna? Me on my Kenny Roberts replica painted FZR1000.(I was preoccupied)
Had a big off after we talked that day. Too much gas out of the pot hole, lost rear, and slid down the middle of the track for 120m. First lap with 15 moderns right up my date. lucky I didn't get run over. All good
Burnt my ass but otherwise all good.

[sidecar bob]

Here's a pic of my setup. Swarfie off here cnc'd the brackets.

[Grumph]

Yeah, the elderly bearded guy who said hello was me...

Just bear in mind that you can spend a fortune on pre 82 legal brakes and it still won't stop like the FZR....Just one of the fun things about racing old bikes.
It's a case of balancing $$ vs the amount of fun....

[Yow Ling]

My pre '82 gsx1100 had brembos on xs1100 discs & at the rate it was being ridden (winning the pre 82 pre 89 all in at cemetery circiut for example) the brakes were fading & seriously over worked & not up to the job at all.
We replaced the discs with 310mm floaters , which are now legal in pre 82 & fitted a brand new pair of Lockheed cp2696 calipers with a 16mm Brembo master cylnder & sintered pads.
The brakes are now the best part of the bike & well worth the investment.
If you want to only go there once, that is the recipie.
Contact these chums for calipers. http://www.racebrakes.co.nz/contact-us.html

The current rules as posted on MNZ website only allow 300mm disk rotors, so unless that has changed your set up isn't quite legal
25.3.1 Suspension & Brakes
Air assisted front forks, mono shock rear suspension, and rear disk brakes, unless fitted as original equipment are prohibited. Front disks must be period, and are limited to 300mm maximum diameter with a maximum of 2-pistons per calliper unless fitted as original equipment to the bike in question.

[sidecar bob]

The current rules as posted on MNZ website only allow 300mm disk rotors, so unless that has changed your set up isn't quite legal
25.3.1 Suspension & Brakes
Air assisted front forks, mono shock rear suspension, and rear disk brakes, unless fitted as original equipment are prohibited. Front disks must be period, and are limited to 300mm maximum diameter with a maximum of 2-pistons per calliper unless fitted as original equipment to the bike in question.

Best we whip 5mm off them then. I bet its still far more legal & cheaper than anything that finishes within five places of it though.
I love the state of the art electronics & exotic materials on one bike that finishes behind us though!!

[malcy25]

The current rules as posted on MNZ website only allow 300mm disk rotors, so unless that has changed your set up isn't quite legal
25.3.1 Suspension & Brakes
Air assisted front forks, mono shock rear suspension, and rear disk brakes, unless fitted as original equipment are prohibited. Front disks must be period, and are limited to 300mm maximum diameter with a maximum of 2-pistons per calliper unless fitted as original equipment to the bike in question.

25.3.1 are pre 72 rules

25.4.6 are the pre 82 rules which say >320mm

[malcy25]

Yeah, the elderly bearded guy who said hello was me...

Just bear in mind that you can spend a fortune on pre 82 legal brakes and it still won't stop like the FZR....Just one of the fun things about racing old bikes.
It's a case of balancing $$ vs the amount of fun....

Oh so true...

[Yow Ling]

25.3.1 are pre 72 rules

25.4.6 are the pre 82 rules which say >320mm

OK thanks, must have stopped reading when I found the part that matched my faulty recolection

[husaberg]

Early Yamahas were opposed piston callipers they changed them later, the TZs for the most part used the same calliper. Including the first models TZ750


These are not to be confused with the Later slider calliper set up as seen on the RD400s etc. (Yamaha changed to the inferior design sliding caliper to avoid paying the royalties to Girling I think)

The Early yam design ones can still be brought her rather cheaply.
The bolt pattern on the Yamaha disks for these are the same up until the FZR1000 likely even later.
I also note that sme Hondas share the same rotor disk and offset pattern early Cb's at least.
Might be more applicable to the other classes though.
They are a steal at each $100US new
http://www.mikesxs.net/products-67.html#products