Author Topic: 1977 CB750K Master Cylinder  (Read 1434 times)

0 Members and 2 Guests are viewing this topic.

Jet Pilot

  • Guest
1977 CB750K Master Cylinder
« on: July 31, 2008, 04:52:29 PM »
I've been in search of a rebuild kit for my 77 CB750K front brake master cylinder, but the OEM Honda parts are on backorder.

K&L makes a kit (PN 32-1101) that fits 69-76 CB750Ks, but no mention is made of 77-78 bikes.
Any sugestions?  Are all the CB750K master cylinders the same? 

I had planned to compare the microfiche OEM part numbers for the various years, but thought someone here might be able to provide an answer a bit quicker so I can get things ordered.

I just bought the bike, and other than a "no front brakes" test ride haven't been able to take it out, and it would be nice to get it on the road.

Thanks...

Offline cb350twin

  • Hot Shot
  • ***
  • Posts: 711
    • http://mail.google.com/a/sohc4.net/
Re: 1977 CB750K Master Cylinder
« Reply #1 on: August 01, 2008, 01:07:02 AM »
Not sure about the part numbers but sure to get some VERY pointy needle nose pilers for the circlip your gonna have a fun time with that. ;)
1975 CB 750 K5
1972 CB 350 Twin K4
1972 CB 500 Four K1

Jet Pilot

  • Guest
Re: 1977 CB750K Master Cylinder
« Reply #2 on: August 01, 2008, 05:58:46 AM »
Hi;
After comparing OEM Honda numbers, the 1977 CB750K internal master cylinder parts are the same as earlier "K" parts.

Not sure about the part numbers but sure to get some VERY pointy needle nose pilers for the circlip your gonna have a fun time with that. ;)

Yep.  I disassembled it last night; that buried circlip is tough to remove.
The master cylinder rubber parts were in surprisingly good shape, but there was a lot of goop clogging the assembly.
I ordered a set of these pliers: http://www.z1enterprises.com/detail.aspx?ID=2868 that should make reassembly a bit easier.
 

joeyboy

  • Guest
Re: 1977 CB750K Master Cylinder
« Reply #3 on: August 01, 2008, 08:02:10 AM »
When I rebuilt mine, I made a few big mistakes.  First, pay attention to the direction everything is facing when you take it apart.  Second, replace all parts including the nice looking rubber ones, even if they look good.  Third, unplug every hole in the assembly.  If you look inside the reservoir you will see a hole about 3/32 dia or so, and another one in front of it.  The front one is considerably smaller, and because of this I thougt it was insignificant.  Not so, this is the hole for the pressure to release so your brakes release.  If you punch it with a scribe a few times and really make sure that the hole is clear, it will work fine.  Last thing is make sure you have the wall of the moving parts very clean using whatever method (aside from sand paper) that can get it that way.  I just used an old toothbrush and plenty of carb cleaner, and it worked fine.  Anyway, that's my spill.  A good resource for parts for your whole bike  would be mrcycles.com/fiche_select.asp?, then go to the left hand part of the screen and push "honda motorcycle parts".  That should help, good luck.

Offline BobbyR

  • Really Old Timer ...
  • *******
  • Posts: 12,367
  • Proud Owner of the Babe Thread & Dirty Old Man
Re: 1977 CB750K Master Cylinder
« Reply #4 on: August 01, 2008, 08:50:32 AM »
When you take it apart wash everythiung in denatured alchohol. It dissolves all the dried up crud. As the eariler post stated,  pass a thin wire through all small pasaages. 
Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?