Fluid Leaking onto front brake lever - newbie

You are right, it's just the dust cover that had the tear. What is the best way to get the piston assembly out??

Well,
#16 is a clip, that's first; then #15 slides off the piston.

#14 is the piston and has a rubber cup or two, that's probably what is bad and leaking. Just pull it out. You may need to poke it from the other end with a longer rod or drillbit to get it out.

Once it's apart start cleaning with alcohol or fresh brake fluid.

Please delete this duplicate duplicate post. :S

Patton wrote:

Removing and replacing the circlip (#16) is often
difficult, and usually requires extra-long-nose
circlip pliers.

Here's a link to the tool offered by Z1E:

Click > Z1E circlip tool

Hope the bore is not pitted beyond recovery.

When ordering the parts, need to know
whether m/c bore size is 14mm or 5/8".
Look for raised letters on bottom of m/c,
which should indicate either 14mm or 5/8".
The 14mm is sometimes referred to as 1/2".

The barrel style 14mm (1/2") m/c was
used with single front disk brakes.
The first dual front disk brakes using the
barrel style m/c was on the 1976 KZ900-B1(LTD)
which increased the m/c bore from 14mm to 5/8",
and is the only 5/8" barrel style m/c I'm aware
of on the large fours.

1977 KZ1000-A1 continued the single front
disk with 14mm barrel m/c.

1978 KZ1000-A2 changed to the trapezoidal
shaped m/c with single front disk, being the
one and only year with a 14mm trapezoidal m/c.

Later models with dual front disks
used 5/8" trapezoidal master cylinders.

Good Luck!

Ok, the bore was pitted pretty badly, looking to replace the whole master cylinder. Of course I have had a hard time finding the part. I wouldn't mind using an after market part. Anyone know where I could find a compatible part. It's a 5/8 bore for the dual caliper setup. I found a guy on ebay who sells them with the 14mm bore, will that work if I am replacing the part??

heady, any of these master cylinders fit the bill? And maybe this is the 14mm master your talking about? I've always wondered about these. Has hole for mirror, brake light switch, looks like a very nice setup!

Yeah, that is the 14mm one I saw. I just don't think it will fit with my current setup. I currently have a 5/8 bore setup. I guess I can measure my banjo bolt..... Anyone have any experience with these??