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1979 KZ650 SR rear master cylinder woes
- doonie
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Gary
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- ckahleer
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94 KE100
81 CM200t
82 KZ305
85 VF1100c
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- martin_csr
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- doonie
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- doonie
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Thanks very much for the reply.
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- ckahleer
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94 KE100
81 CM200t
82 KZ305
85 VF1100c
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- doonie
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Yes it does. I had the whole thing apart to clean it all up and sprayed it down with brake cleaner. All the parts look good but I understand you can't judge the condition of the seals by looks. When I compressed the piston in order to reattach the circlip it all seems to be working freely popping right back up after compression.ckahleer wrote: Not poring out, but you should get a squirt each time you press the piston in. The piston is spring loaded. Does it pop back out after pressed in?
I would assume that I would get at least a squirt each time I depress the peddle but nothing, even with the brake line removed. There are no fluid leaks anywhere so it really has me puzzled. But as I mentioned, the front brake was doing the exact same thing until I put on a new aftermarket master cylinder. It took just a few minutes to bleed that system and it now works great. Could the seals be that worn out that they are building up absolutely no pressure ? Seems unlikely to me, especially because it's not leaking. I did have some brake before I took everything apart. Very little but enough that I couldn't turn the rear wheel when up on the centerstand with rear brake applied. Now nothing at all.
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- Rick H.
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Rick H.
Rick H.
1977 Kawasaki KZ-1000A1
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- Mikaw
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If you had low pressure before cleaning and rebuild, I’d replace the seals and piston. You need to run a ball hone in the bore to break the glaze and give the new seal a surface to bite into and work. MOST MC bores are either 1/2” or 5/8. Ball hone are easy to find. Buy fine, medium, and corse grit. I have had success with a 320 grit as the final cut. I’ve rebuilt several and have one going on 5 season and every spring so far the rear brake is firm on the first pump.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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- Mikaw
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www.kzrider.com/forum/5-chassis/466301-r...er-cylinder-79-kz650
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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- Mikaw
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www.partzilla.com/catalog/kawasaki/motor...cylinder-brake-pedal
Just a quick Fleabay search showed the primary cup is available
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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- doonie
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I've also been searching these forums for days before posting for help. Someone said the KZ1000 master cylinder will bolt directly to my bike. Someone also said a master cylinder from a 2006 Vstrom will work on a KZ1000. So that would mean the one from the Vstrom would also fit the 650. I have no idea if this is true but I ordered one off Ebay and I'll see if I can rig it up. I'll keep you posted. Thanks very much for the advice.
Gary
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