Front brake resivor.

[oldviolin501]

I have a 85 gs 700e. I need to replace the whole thing it's to far gone to repair it. What years and models other than mine can I use?

[Agemax]

almost all of them. if you have a single disc any model will work. if you have twin discs, get one from a twin disc model

[oldviolin501]

I have two disk but I think it's a single line from the resivor to a splitter... Does that still matter if I get one off of a single or not?

[SqDancerLynn1]

The # of lines makes no difference. It is the # of disks

[oldviolin501]

What's the difference in the two is what I'm asking?

[Agemax]

What's the difference in the two is what I'm asking?

a master cylinder with a 2 disc set up has to provide enough fluid volume and pressure to make 2 calipers work. a 1 disc set up has a smaller pressure/fluid to only make 1 caliper work

[oldviolin501]

ok, cool. thanks for the help

[mike_of_bbg]

There should be a number stamped on the bottom of the master. That's your piston bore size. You could use just about any master that clamps onto 7/8" bars with that same piston size and 10mm right-hand thread mirror mount successfully.

Smaller diameter pistons produce more pressure, less movement. The single-caliper masters from the GSes are usually 14mm IIRC, I think the duals are 5/8" (?) or about 16mm.