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02-01-2024, 02:13 PM
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#1 |
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Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Source for master cylider rubber cups?
Rebuilding three master cylinders fitting 3/4 ton Chevs (68-72), correct aftermarket "parts kits" for this one seem difficult to find, and kit prices in general seem not very decent.
Bore is 1.25" and I simply want to replace the 2 and 3 "hole in center" rubber/whatever cups used on the two pistons in each cyl. I have exact dimension measurements. Where can a guy buy just the cups? Any help appreciated.
__________________
CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp Last edited by CCCC; 02-02-2024 at 06:49 PM. |
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02-02-2024, 10:45 PM
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#2 |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 19,981
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Re: Source for master cylider rubber cups?
Bump
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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02-02-2024, 11:09 PM
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#3 |
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Registered User
Join Date: May 2011
Location: Reno Nevada
Posts: 377
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Re: Source for master cylider rubber cups?
I have found E Bay to be a great source.
Vic |
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02-04-2024, 06:47 PM
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#4 |
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Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: Source for master cylider rubber cups?
BUMP Help !!
__________________
CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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02-04-2024, 09:30 PM
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#5 |
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Senior Member
 
Join Date: Nov 2018
Location: Waterford California
Posts: 2,378
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Re: Source for master cylider rubber cups?
A few years ago I was having a hard time finding wheel cylinder kits for my 46 CJ2A Jeep.
My local Napa had a book that showed most of the years and makes of wheel slave cylinders and sizes. I just went in and started thumbing through it till I found what I thought would work. If I remember correctly it was a Crown Victoria like the Police cars that I decided would work, they were like $8 a kit and worked perfectly. That could be an option for you. |
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02-04-2024, 09:41 PM
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#6 |
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Registered User
Join Date: Feb 2022
Location: Ca
Posts: 407
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Re: Source for master cylider rubber cups?
I recall seeing them on GMCPAUL site. Not the easiest site to navigate but they have good quality parts and superior service.
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02-05-2024, 02:14 PM
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#7 |
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Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: Source for master cylider rubber cups?
Thanks for these replies. Have tried Ebay and still searching - bought two kits and vendor sent wrong dia. Says they do not have the 1.25" bore kit.
Tried local NAPA - they have no cups or kits. Did look in their books and found some, but mgr. says they can't get them. I plan to try NAPA warehouse in big city. GMC Paul's does not show them, so just sent them an Email inquiry. Thanks again. Any others?
__________________
CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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02-05-2024, 05:51 PM
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#8 |
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Active Member
Join Date: Sep 2023
Location: randolph va
Posts: 123
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Re: Source for master cylider rubber cups?
drum or disc and is it power brakes
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02-05-2024, 05:54 PM
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#9 |
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Active Member
Join Date: Sep 2023
Location: randolph va
Posts: 123
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Re: Source for master cylider rubber cups?
here is a link for manual brakes
https://www.partsgeek.com/4h8zyb3-ch...xoCVjUQAvD_BwE |
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02-05-2024, 07:19 PM
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#10 | |
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Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: Source for master cylider rubber cups?
Quote:
Rear drum front disc (retrofit) and I had tried PartsGeek (will sell me an MC, but not internal parts) and have tried LMC, Brothers, GMCPaul's, etc.
__________________
CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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03-20-2024, 10:16 PM
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#11 |
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Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: Source for master cylider rubber cups?
I have visited every decent parts place in the area and called others as far as 90 miles away. Seems they simply no longer stock the rubber cups used in rebuilding this MC.
The rebuilding kits online don't show 1.25 bore. I have made contact with a brake cylinder rebuilder to see if they will sell me some - but contact does not seem to understand what I need. So, bumping this up for another shot with you all. Any ideas?
__________________
CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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