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#1 |
Registered User
Join Date: Jun 2022
Location: Bothell, Washington
Posts: 25
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'76 K25 brake issue
I am having a weird issue with the brakes in the '76. The brakes feel like they should be stiffer, but have not had a problem ever being able to stop the truck. However, occasionally when coming to a stop slowly and dragging the brakes I've had the pedal suddenly go to the floor. It happened one time recently where I was sitting at a stop light and felt the brake pedal suddenly lose pressure. One pump and it was back. Could it be air trapped in the system? The only other idea would be the master cylinder is going bad, it has occasionally wept fluid from between the m/c and the booster. Again this isn't a consistent issue of losing pressure on the pedal. Any help would be greatly appreciated.
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#2 |
Registered User
Join Date: Mar 2014
Location: Bakersfield
Posts: 12
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Re: '76 K25 brake issue
sounds like the master is going bad! Block off the 2 ports and press the pedal, if you get movement the master is bad.
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#3 |
Registered User
Join Date: Jun 2022
Location: Bothell, Washington
Posts: 25
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Re: '76 K25 brake issue
I thinks so too. It was leaking again the other day. I want to try and rebuild the master, when I go looking for a rebuild kit what info would I need? She's a 3/4 ton, 4x4 camper special and according to the option list has the heavy duty braking system.
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#4 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: '76 K25 brake issue
That should be all you need to get started on searching for a kit. Manual/power versions might be diff as well (bore size).
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#5 |
Registered User
Join Date: Jun 2022
Location: Bothell, Washington
Posts: 25
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Re: '76 K25 brake issue
I went to NAPA and they can't get the kit and they say the manufacturer doesn't make it anymore. Don't know which manufacturer it was. Any other places to look?
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#6 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,541
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Re: '76 K25 brake issue
Probably not enough demand for a DIY kit as most folks just buy a rebuilt MC.
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#7 |
Junior Member
![]() Join Date: Feb 2015
Location: chicagoland
Posts: 30
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Re: '76 K25 brake issue
You won't find a rebuild kit but here is what I did.
I want my truck to look as original as possible. When replacing the master cylinder, it seems all I could find was a big ole squared off looking thing that did not look at all like the original. Had a single bolt on cap instead of the two wire bales. Knowing that the bore of my original was 1", I think, I ordered a master for the correct application with the same size bore. I disassembled both, honed out the original to clean it. Then reassembled the old master with the new innerds and it's been doing fine. |
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#8 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: '76 K25 brake issue
Quote:
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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