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Dual front brakes: factory?

  • Thread starter Thread starter Chainsaw
  • Start date Start date
C

Chainsaw

Guest
I have a 1977 GS750 with dual front brakes. Now, this bike hasn't been driven in 20 years until just recently. I bled out all of the old fluid and my front brakes still feel really spongy. Before I start taking things apart and checking them out, I was just curious if dual front brakes was an option for that year and model. From the pictures I've looked at in the photo gallery, a lot of '77's had a single disc.

Thanks,
KC
 
Based on the info I found on my bike, the 77 was only single disk.
I swapped my front end out to an 1100EZ for the larger forks and dual disks.
 
No dual brakes or mag wheels in "77". In "78" the "E" models were born, thus the dual brakes & mags
 
No a true 77 only had single disc. ALL had wire wheels. The dual disc, according to my research didnt come on till 78, and even part of those were still single and wire rims. If yours are still wires and have dual, its a conversion, forks probably from a 78 or 79, and another single sided disc (im pretty sure the dual disc rotors are different from the single, but i could be wrong.)
 
Can you figure out what year and model M/C is being used? If not since you can't rebuild it buy a M/C off a newer model with dual discs.
 
Single disc models used a 295mm disc. Twin disc models used smaller discs. I have a set off a dual setup and they are 275mm (Katana). Fork legs have the attachment points on the bottom legs spaced differently also.
 
rphillips said:
No dual brakes or mag wheels in "77". In "78" the "E" models were born, thus the dual brakes & mags
Click to expand...

Hm, My vin placard says GS750E, I have mag wheels and 2 front discs. I'm going to have to double check the year on this thing. :confused:
 
please correct me if i'm wrong, but I'm thinking the solid disc, single or dual, are the same side. The drilled disc are smaller. The Katana will have drilled.
 
Plain rotors are the same, as far as i can tell, slotted and drilled rotors, obviously different but that came later on. But i've yet to see a wirewheeled bike with dual that came stock.
 
If you go dual and keep the same master cylinder as original for the single disc model, you will get more brake pressure for a given amount of finger pressure. The master cylinder diameter is smaller, there will be a longer lever travel as well, giving a brake which is easier to control, a better feel.
No need to change out master cylinders.
As long as there is no air and the hoses are in good shape, all is good.
Both my '78 750s have worked fine this way.
 
Looks like I have a '78 model. The craigslist ad said '77, but the placard says it's a GS750E, and the build date is 08/77. So I'm pretty sure that would make it a '78.
 
Chainsaw if you have mags abd dual discs your model is definitely a '78. Probably one of the first if built in '77. Cheers
 
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