Front Master Cylinder
- gordone
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Front Master Cylinder
22 Mar 2018 15:07
I have overhauled my front calipers and replaced the brake lines, the master cylinder was new last year.
Right now can I easy push the brake handle 1/2, after that is harder and on 2/3+ its hard...
What is normal handling of the handle?
I`m feeling it should be harder... right now is identical to what it was before the overhauling...
I don`t know if I expressed me good here? hehe
Right now can I easy push the brake handle 1/2, after that is harder and on 2/3+ its hard...
What is normal handling of the handle?
I`m feeling it should be harder... right now is identical to what it was before the overhauling...
I don`t know if I expressed me good here? hehe
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
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- Scirocco
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Re: Front Master Cylinder
22 Mar 2018 16:09
Have you a single disk MC 1/2" (14 mm) or Dual disk MC 5/8" (16 mm)???
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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- 650ed
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Re: Front Master Cylinder
22 Mar 2018 17:02
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- gordone
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Re: Front Master Cylinder
22 Mar 2018 23:25Scirocco wrote: Have you a single disk MC 1/2" (14 mm) or Dual disk MC 5/8" (16 mm)???
Dual disc.
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
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- Scirocco
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Re: Front Master Cylinder
23 Mar 2018 00:55
Then you have to bleed a little more air bubbles out of the calipers.
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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- Z1Driver
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Re: Front Master Cylinder
23 Mar 2018 11:04
You might have to bleed the master too. I replaced the Brake Fluid on my C14 (I know different bike all the way around) I use a Mity Vac to remove old fluid which will drain the reservoir quickly if you are not careful which I was not. So I refilled the reservoir keeping a much closer eye on it and bled the calipers till the cows came home. I removed all the bubbies and still had a brake lever as you describe. Sometimes if one ties the brake lever tightly to the grip so the brake is applied over night, air will work it's way out of the little bleed hole in the master. After a night of that, the next day resulted with no difference in the lever. So I punted and bled the master. Ended up with a great brake handle with a ah ha moment.
when I replaced the caliper on the 900, I don't recall having a problem with the system using the Mity Vac. Must have been lucky....Good luck. Tin
when I replaced the caliper on the 900, I don't recall having a problem with the system using the Mity Vac. Must have been lucky....Good luck. Tin
Blue 1975 Z1B
Red 2009 Concours 14
Red 2009 Concours 14
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- Nessism
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Re: Front Master Cylinder
23 Mar 2018 11:50
You might want to try pumping up the hand lever and then squeezing as hard as you can, then strap the lever back against the grip. The idea is to create as much pressure inside the system as possible so the pistons move closer to the discs. Leave the bike with the lever pulled back for 24 hours and see if the lever firms up.
BTW, did you lubricate the caliper sliding pins with heavy duty black moly caliper grease?
BTW, did you lubricate the caliper sliding pins with heavy duty black moly caliper grease?
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
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- ajsfirehawk
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Re: Front Master Cylinder
23 Mar 2018 12:12
Nsssism, I've often heard the process you describe above. When I've heard it before the cap was to be left of the master cylinder reservoir. Cap on or off make any difference?
79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1
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- gordone
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Re: Front Master Cylinder
23 Mar 2018 17:20Z1Driver wrote: You might have to bleed the master too. I replaced the Brake Fluid on my C14 (I know different bike all the way around) I use a Mity Vac to remove old fluid which will drain the reservoir quickly if you are not careful which I was not. So I refilled the reservoir keeping a much closer eye on it and bled the
calipers till the cows came home. I removed all the bubbies and still had a brake lever as you describe. Sometimes if one ties the brake lever tightly to the grip so the brake is applied over night, air will work it's way out of the little bleed hole in the master. After a night of that, the next day resulted with no difference in the lever. So I punted and bled the master. Ended up with a great brake handle with a ah ha moment.
when I replaced the caliper on the 900, I don't recall having a problem with the system using the Mity Vac. Must have been lucky....Good luck. Tin
How did you bleed the master cylinder?
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
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- gordone
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Re: Front Master Cylinder
23 Mar 2018 17:21 - 23 Mar 2018 17:22Nessism wrote: You might want to try pumping up the hand lever and then squeezing as hard as you can, then strap the lever back against the grip. The idea is to create as much pressure inside the system as possible so the pistons move closer to the discs. Leave the bike with the lever pulled back for 24 hours and see if the lever firms up.
BTW, did you lubricate the caliper sliding pins with heavy duty black moly caliper grease?
Will try these over the easter.
Yes used brake high temp grease.
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Last edit: 23 Mar 2018 17:22 by gordone.
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- Nessism
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Re: Front Master Cylinder
23 Mar 2018 20:18ajsfirehawk wrote: Nsssism, I've often heard the process you describe above. When I've heard it before the cap was to be left of the master cylinder reservoir. Cap on or off make any difference?
Doesn't matter.
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
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- gordone
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Re: Front Master Cylinder
24 Mar 2018 00:42Nessism wrote:Doesn't matter.ajsfirehawk wrote: Nsssism, I've often heard the process you describe above. When I've heard it before the cap was to be left of the master cylinder reservoir. Cap on or off make any difference?
If i understand these correct, when you have pressure on the line will the gravity force the air to go up because the weight of the fluid is higher then the air. In therey you will build over pressure in the resvoir by adding air when the cap is on.
But the pressure will have enoufg force to build some over pressure.
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Please Log in or Create an account to join the conversation.