6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > Wheels, Tires, Suspension and Brakes
#Sponsored

Wheels, Tires, Suspension and Brakes Keep them doggies rollin', rawhide

Reply
 
Thread Tools
  #1  
Old April 18th, 2021, 10:39 PM
geasson geasson is offline
Junior Member
 
Join Date: Mar 2014
Location: Oxford, MS
Truck: I don't own one - YET!
Age: 68
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 73
geasson is on a distinguished road
Default Master cylinder 1-ton 1966

Well, it is running. Rough but it is running. It has no brakes and fluid is leaking out the back of the master cylinder and leaking on the inside. I suspect a new master cylinder is needed or at least a rebuild kit. My issue is that I have the rectangular master cylinder and according to the catalogs, a 1966 should have a round master cylinder. Did the PO change to an older master cylinder or did the 1-tons continue using the rectangular master cylinder. Which one should I buy???
Attached Images
File Type: jpg 71-210-th.jpg (5.6 KB, Multiple views, 35 clicks)
File Type: jpg 71-211.jpg (99.3 KB, Multiple views, 2 clicks)
Reply With Quote
  #2  
Old April 18th, 2021, 11:24 PM
Simonsays Simonsays is offline
Junior Member
 
Join Date: Apr 2021
Location: Los Angeles california
Truck: 1966 3/4 ton
Posts: 20
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 29
Simonsays is on a distinguished road
Default Re: Master cylinder 1-ton 1966

I think as long as the bore size is the same it shouldn't matter. I have a 3/4 ton 1966 and mine takes the round one. You can take your apart and measure the bore size of the piston. I believe I saw it's either 1 inch or 1 1/8 inch.
Reply With Quote
  #3  
Old April 19th, 2021, 02:42 AM
Ed Snyder's Avatar
Ed Snyder Ed Snyder is offline
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Medford, Oregon
Truck: 1962, 1967
Posts: 890
Thanks: 0
Thanked 5 Times in 3 Posts
Rep Power: 352
Ed Snyder has a spectacular aura aboutEd Snyder has a spectacular aura aboutEd Snyder has a spectacular aura aboutEd Snyder has a spectacular aura aboutEd Snyder has a spectacular aura aboutEd Snyder has a spectacular aura about
Default Re: Master cylinder 1-ton 1966

Quote:
Originally Posted by geasson View Post
Well, it is running. Rough but it is running. It has no brakes and fluid is leaking out the back of the master cylinder and leaking on the inside. I suspect a new master cylinder is needed or at least a rebuild kit. My issue is that I have the rectangular master cylinder and according to the catalogs, a 1966 should have a round master cylinder. Did the PO change to an older master cylinder or did the 1-tons continue using the rectangular master cylinder. Which one should I buy???
The one on my 1965 one ton is round, but it has a screw-on lid.
Attached Images
File Type: jpg IMG_3786.JPG (1.41 MB, Multiple views, 6 clicks)
__________________
Ed Snyder
Medford, Oregon
1962 1000 Pickup 401M & Muncie 318 with overdrive
1962 K1000 Suburban 401M & SM420
1967 CM1500 pickup 351E & NP435
Reply With Quote
  #4  
Old April 26th, 2021, 03:10 PM
geasson geasson is offline
Junior Member
 
Join Date: Mar 2014
Location: Oxford, MS
Truck: I don't own one - YET!
Age: 68
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 73
geasson is on a distinguished road
Default Re: Master cylinder 1-ton 1966

It looks to me like there is little consistency in master cylinders. I guess I will need to get it removed and measure the bore and them find one. THanks for all the input.
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
1966 4000 Master Cylinder animalsservicar Wheels, Tires, Suspension and Brakes 2 May 2nd, 2019 04:42 AM
1966 4000 Master Cylinder animalsservicar Wheels, Tires, Suspension and Brakes 0 April 29th, 2019 02:14 AM
'64 single reservior master cylinder to dual reservior master cylinder upgrade Archiver Previous Forum Posts 1 November 21st, 2012 01:02 AM
Re: Master Cylinder Archiver Previous Forum Posts 0 September 14th, 2002 02:48 AM
Re: Master Cylinder Archiver Previous Forum Posts 0 September 14th, 2002 02:40 AM


All times are GMT +1. The time now is 10:03 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 871733498009|1732309420|0