- Posts: 15
- Thank you received: 1
1979 KZ650 SR rear master cylinder woes
- doonie
- Topic Author
- Offline
- User
Gary
Please Log in or Create an account to join the conversation.
- ckahleer
- Offline
- User
- Posts: 434
- Thank you received: 143
94 KE100
81 CM200t
82 KZ305
85 VF1100c
Please Log in or Create an account to join the conversation.
- martin_csr
- Offline
- User
- Posts: 8068
- Thank you received: 1656
Please Log in or Create an account to join the conversation.
- doonie
- Topic Author
- Offline
- User
- Posts: 15
- Thank you received: 1
Please Log in or Create an account to join the conversation.
- doonie
- Topic Author
- Offline
- User
- Posts: 15
- Thank you received: 1
Thanks very much for the reply.
Please Log in or Create an account to join the conversation.
- ckahleer
- Offline
- User
- Posts: 434
- Thank you received: 143
94 KE100
81 CM200t
82 KZ305
85 VF1100c
Please Log in or Create an account to join the conversation.
- doonie
- Topic Author
- Offline
- User
- Posts: 15
- Thank you received: 1
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.
Please Log in or Create an account to join the conversation.
- Rick H.
- Offline
- User
- Posts: 854
- Thank you received: 255
Rick H.
Rick H.
1977 Kawasaki KZ-1000A1
Please Log in or Create an account to join the conversation.
- Mikaw
- Offline
- Sustaining Member
- Posts: 5007
- Thank you received: 1918
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.
Please Log in or Create an account to join the conversation.
- Mikaw
- Offline
- Sustaining Member
- Posts: 5007
- Thank you received: 1918
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.
Please Log in or Create an account to join the conversation.
- Mikaw
- Offline
- Sustaining Member
- Posts: 5007
- Thank you received: 1918
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.
Please Log in or Create an account to join the conversation.
- doonie
- Topic Author
- Offline
- User
- Posts: 15
- Thank you received: 1
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
Please Log in or Create an account to join the conversation.