1968 c10 brake problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jones1 · 04-22-2016, 11:41 AM

Good Morning
New member here, first post
I have a 1968 c10 with power drum brakes. Have replaced all the brake wheel cylinders and master cylinder but can not get any fluid to the rear cylinders. bench bled the master before installing and now not sure how to procede. there is a proportioning valve on the output of the master cylinder. I have not replaced the rear rubber flex hose. When I went to replace the rear cylinder had the wrong ones and took couple days to find correct ones. During this time I left the brake line loose and the fluid drained out of the rear master cylinder so I just replaced the master cylinder at this time. Any help/suggestions would be most appreciated.
Thanks
Roy Jones

Texasredneck69-C10 · 04-22-2016, 12:05 PM

I would put my air gun adapter on my compressor and try to blow out the lines to the rear. I would have someone watch the other end to see if anything comes out (make sure they are not looking at it directly so they don't get an eye injury lol)

Dave K. · 04-22-2016, 03:22 PM

I just dealt with this last week. I removed the rear hose and it would appear it had collapsed inside. Put on a new one and both wheel cylinders saw fluid.

If it looks old, cracked and crusty just replace it.

jones1 · 04-22-2016, 03:27 PM

Thanks for the replies. The rear rubber brake hose is original (1968) I will remove and replace.
Thanks Again
Roy

Dave K. · 04-22-2016, 03:31 PM

Mine is a 68 as well--probably a design issue that they don't last over 40 years or something! I found the connection at the back up in the frame a bear to get onto and break free with the brake wrench so I had to cut it and splice in a line midway up the frame to the back. It was pretty rusted and pitted anyway. Mine's a K10 SWB though.

7tee · 04-22-2016, 03:43 PM

After you disconnect the rubber hose from the steel line at the frame, pump the brakes to see if fluid comes out of the steel line. If it does then the rubber hose could very well be your problem...

jones1 · 04-22-2016, 09:00 PM

Thanks All. Going to check in the morning

BigJohn145 · 04-23-2016, 12:22 PM

Quote:

Originally Posted by jones1

Thanks All. Going to check in the morning

I had that problem on my 69 c-10 and it was the proportioning value that was bad
Posted via Mobile Device

04-22-2016, 11:41 AM	#1
jones1 Registered User Join Date: Apr 2016 Location: Pinson, Al Posts: 3	1968 c10 brake problem Good Morning New member here, first post I have a 1968 c10 with power drum brakes. Have replaced all the brake wheel cylinders and master cylinder but can not get any fluid to the rear cylinders. bench bled the master before installing and now not sure how to procede. there is a proportioning valve on the output of the master cylinder. I have not replaced the rear rubber flex hose. When I went to replace the rear cylinder had the wrong ones and took couple days to find correct ones. During this time I left the brake line loose and the fluid drained out of the rear master cylinder so I just replaced the master cylinder at this time. Any help/suggestions would be most appreciated. Thanks Roy Jones

04-22-2016, 12:05 PM	#2
Texasredneck69-C10 Registered User Join Date: Apr 2016 Location: Fort Collins Posts: 31	Re: 1968 c10 brake problem I would put my air gun adapter on my compressor and try to blow out the lines to the rear. I would have someone watch the other end to see if anything comes out (make sure they are not looking at it directly so they don't get an eye injury lol)

04-22-2016, 03:22 PM	#3
Dave K. Registered User Join Date: Jul 2009 Location: Milwaukee, WI Posts: 575	Re: 1968 c10 brake problem I just dealt with this last week. I removed the rear hose and it would appear it had collapsed inside. Put on a new one and both wheel cylinders saw fluid. If it looks old, cracked and crusty just replace it. Last edited by Dave K.; 04-22-2016 at 03:32 PM.

04-22-2016, 03:27 PM	#4
jones1 Registered User Join Date: Apr 2016 Location: Pinson, Al Posts: 3	Re: 1968 c10 brake problem Thanks for the replies. The rear rubber brake hose is original (1968) I will remove and replace. Thanks Again Roy

04-22-2016, 03:31 PM	#5
Dave K. Registered User Join Date: Jul 2009 Location: Milwaukee, WI Posts: 575	Re: 1968 c10 brake problem Mine is a 68 as well--probably a design issue that they don't last over 40 years or something! I found the connection at the back up in the frame a bear to get onto and break free with the brake wrench so I had to cut it and splice in a line midway up the frame to the back. It was pretty rusted and pitted anyway. Mine's a K10 SWB though.

04-22-2016, 03:43 PM	#6
7tee Registered User Join Date: Mar 2015 Location: Fletcher, N.C. Posts: 309	Re: 1968 c10 brake problem After you disconnect the rubber hose from the steel line at the frame, pump the brakes to see if fluid comes out of the steel line. If it does then the rubber hose could very well be your problem... __________________ 1970 C/10 350/T5 SWB stepper... 1979 Corvette 350/Auto T-top... 2010 Acura RL... 2015 2500HD Z-71 Silverado...

04-22-2016, 09:00 PM	#7
jones1 Registered User Join Date: Apr 2016 Location: Pinson, Al Posts: 3	Re: 1968 c10 brake problem Thanks All. Going to check in the morning



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