Master cylinder upgrade

[Andre]

Sorry, but your calculations can't be correct as there are different sized pistons in the 14: Eight 27 mm pistons and four 24 mm pistons.

[mlivkovich]

Thank you Andre, I missed that, hard to put measuring tool in caliper body. It means that gsx has even smaller caliper piston area,.

[Andre]

Easy one to miss I happend to have pistons and measuring thingy within reach.

BTW, I am happy with the 6-pods after rebuilding calipers and MC as well as switching the 16 year old rubber hoses to braided ones. One finger is enough to operate in most conditions.

[Hooli]

Recheck your figures for the six pots. I don't recall the sizes but I'm sure two pistons are smaller than the other four.

[gsxbarmy]

Recheck your figures for the six pots. I don't recall the sizes but I'm sure two pistons are smaller than the other four.

I'm not so sure Andy - from memory the centre piston on each half of the caliper is larger than the outer 2 - so in any one caliper you will have 2 large (centre) pistons and 4 smaller (outer) pistons

[Andre]

It's the other way around 4 x 27 mm and 2 x 24 mm. Not relying on memory here but eyes.

[V_i_c_i]

I think that there were more types of 6 pod calipers. Older one have same piston diameter and the new one have some piston smaller and some bigger.

[Andre]

I got a K2 and they are different sizes (as above)

[Hooli]

I got a K2 and they are different sizes (as above)

I've got an early K2 (frame 240ish) and have various size pistons.

[seth]

The part number never changed on gsx1400 brake calipers so they should all be the same across all years .

[mlivkovich]

K2, 8 pots 27mm, 4 pots 24mm, thanks Andre and Hooli for the info

[VladTepes]

So.. has anyone changed their master cylinder yet and what were the results?

[Tally]

@mlivkovich. It's not a master cylinder upgrade I want , all I need to know is the diameter of the caliper pistons just in case I need to send the ones I got back. Thanks.

[Tally]

@mlivkovich , ignore my question I was looking at the wrong post.

[mlivkovich]

@Tally if you read carefully this thread you will find piston diameters