Results 1 to 8 of 8
  1. #1
    CB750 Member Trenton's Avatar
    Join Date
    Oct 2019
    Location
    NJ Shore
    Posts
    7

    73 CB750 caliper MC help!!

    Rebuilding the MC as it was original. Ordered a rebuild kit. Then a second one because I thought I made a mistake. Both came in with a smaller diameter kit than what is on the bike. Plunger was about 1MM smaller. Could this be because the MC came from an older model and used anyway at the factory? I was told the entire brake system is original. Would anyone know if the rebuild kit for a 73 cb750 master cylinder uses the same kit as all bikes from 70-78? THis one has a clear plastic reservoir. Thanks in advance!

  2. #2
    Moderator dirtdigger's Avatar
    Join Date
    Feb 2012
    Location
    Black Hawk SD
    Posts
    2,840
    If it has a plastic reservoir it is not original 73. Original is metal with a screw on cap. post a picture maybe be able to tell you what it is.

  3. #3
    CB750 Member Trenton's Avatar
    Join Date
    Oct 2019
    Location
    NJ Shore
    Posts
    7

    photos

    Click image for larger version. 

Name:	IMG_2972.jpg 
Views:	2 
Size:	111.9 KB 
ID:	9186Click image for larger version. 

Name:	IMG_2973.jpg 
Views:	3 
Size:	74.8 KB 
ID:	9187Click image for larger version. 

Name:	IMG_2972.jpg 
Views:	2 
Size:	111.9 KB 
ID:	9186Click image for larger version. 

Name:	IMG_2973.jpg 
Views:	3 
Size:	74.8 KB 
ID:	9187

  4. #4
    CB750 Member Trenton's Avatar
    Join Date
    Oct 2019
    Location
    NJ Shore
    Posts
    7
    well first time uploading photos sorry came out twice!

  5. #5
    Moderator dirtdigger's Avatar
    Join Date
    Feb 2012
    Location
    Black Hawk SD
    Posts
    2,840
    That definitely not the original master cylinder.

  6. #6
    CB750 Guru amc49's Avatar
    Join Date
    Sep 2015
    Location
    Fort Worth TX.
    Posts
    2,573
    No, it isn't. It's for dual discs and why it's 5/8". The original one is 9/16" as it was used on a single disc bike, and why your parts are too small.

  7. #7
    CB750 Member Trenton's Avatar
    Join Date
    Oct 2019
    Location
    NJ Shore
    Posts
    7
    So my choices are to replace this with an original single disc MC or rebuild this one. Would anyone know where to get a rebuilding kit for this one? also I guess the only place to find a replacement is ebay? This is my first Honda so please forgive my questions.

  8. #8
    CB750 Member KRBJ's Avatar
    Join Date
    Jul 2019
    Location
    Fort Bragg
    Posts
    12
    Quote Originally Posted by Trenton View Post
    So my choices are to replace this with an original single disc MC or rebuild this one. Would anyone know where to get a rebuilding kit for this one? also I guess the only place to find a replacement is ebay? This is my first Honda so please forgive my questions.
    l
    Look here for a used oem
    http://forums.sohc4.net/index.php/board,181.0.html

    Or post here for the oem you want.

    http://forums.sohc4.net/index.php/board,182.0.html

    If you don't find the info.you want at one of these sites it is not on this planet.

Similar Threads

  1. Bleeding the twin piston, twin caliper front brakes. CB750 F 1983.
    By Chris in Dorset England in forum Frame / Suspension
    Replies: 4
    Last Post: 10-14-2018, 05:43 AM
  2. 78 cb750 super sport rear caliper
    By cbkfam in forum Builds
    Replies: 3
    Last Post: 07-20-2016, 11:32 PM
  3. Caliper comparability
    By prodgod in forum The CB750 Garage
    Replies: 1
    Last Post: 02-27-2016, 07:16 AM
  4. Wanted - Rear caliper cheap.
    By andronik in forum Classifieds
    Replies: 0
    Last Post: 05-15-2014, 02:54 PM
  5. 76 cb750 front caliper piston
    By s10hornet in forum The CB750 Garage
    Replies: 0
    Last Post: 06-10-2013, 09:22 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •