KZ900 1976 front brake caliper help

Hi I have a KZ900 LTD 1976 and front brakes don't work so I re build the master cylinder and bleed the system but still not working, I decided to take of both calipers ad check them in one of them the piston is stuck so I decided to re build them but I don't know how to take off the piston. I have downloaded the Z1 manual but the calipers are deferent.

Thank's in advance


Luis

keep bleeder tight.
Put an air gun nozzle in the line hole!
KEEP FINGERS CLEAR! And blow alot of air in! It will pop out with a bang, if it really stuck.
If air don't work. Get a gease gun and fit a fitting in some how and use hydraulic pressure.

wrap the caliper in a rag before pumping air into it

Those guys are right, but I have to ask, why is this in the Engine forum?

well its now the engine brake forum! :laugh:

T_Dub wrote: Those guys are right, but I have to ask, why is this in the Engine forum?

Moved from Engine forum to Chassis forum.

wireman wrote: wrap the caliper in a rag before pumping air into it

Arrange some of the rag to catch the piston when it POPS.

Bill

Man I got a fright when I did this the first time. Friggin piston went zooming off, I was astounded!

Hi again and thank you all! the pistons just poped out. Done the calipers there were both dirty clean them up and install them again, I got one of those vacum pumps bleed the sistem and still I can get the brakes working, check for leaks and every thing looks ok, bough a used brake pump and seams to pump the fluid the guy who selled to me try it with a some fluid an put is finger in the banjo bolt and it got presure. What could it be? Bad brake pump?

Thank you all the pistons popped out! So I did both calipers and install them again, bough one of those vacuum pumps and bleed the system and still the brakes don’t work, checked for leaks and everything looks ok, bought a used brake pump because the one that came with the bike was a bit small (the guy who sell it to me said it was working even he try it putting is finger in the banjo bolt hole and it got pressure) so I installed the used pump bleed again and still no pressure. What could it be?


Thank you

Luis

they can be a tempermental pain in the ass to say the least,sometimes you can gravity bleed them to get them started.
get an empty clean jar and fill it with 2-3" of brake fluid,then get a piece of clear vinyl tubing like they use on fish tanks that you buy at local hardware store making sure it fits tight onthe bleeder valve on caliper.
hook one end to a bleeder valve on one caliper and the other end done in the jar making sure it stays submerged in the brake fluid,then crack the bleeder valve open and let it sit for a few hours making sure to keep master cylinder topped off with fluid.
once you see fluid coming through the hose ,close bleeder valve and do same thing on other caliper then try bleeding brakes again.
dont forget the back brake,if you have a disc instead of drum its probably in same condition as front.
id pull the back wheel apart even if it has a drum brake,they werent the greatest of stoppers to begin with and 35 years probably hasnt helped it or the wheel bearings any

I've found that when bleeding brakes with a vacuum pump or fluid pump air can get into the system through the threads on the loosened bleeder. Put some teflon tape or some pipe dope on the bleeder threads to stop the air leak.