New to the forums, new to the big truck world. Brakes? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68-Chevy-C50 · 08-05-2017, 05:17 PM

I recently picked up a 68 Chevy C50, I have got it running and I am able to drive it around the farm. The problem I am running into is with the brakes. I am able to stop the truck after multiple pumps of the brakes, I attempted to flush and bleed the lines, however, I am only getting a small drip to come out. Any suggestions on how to either fix my brakes in a different way, or solve my bleeding problem? Thanks!

nonstop · 08-05-2017, 11:09 PM

Sounds like you might have a bad master cylinder or need to do a thorough bleeding including the master cylinder. Does it have power brakes?

sweetk30 · 08-05-2017, 11:17 PM

there should be 2 bleader screws on the master/booster under the cab .

also 1 on the firewall booster possible .

and also check and see if you are holding vac on the booster under the cab . if not this might be a bad check valve .

but with out seeing what you have some of this info might be wrong . as there was a few systems .

and also if the brake shoes are out of adjsutment or paper thin material then they need adjusted or replaced .

68-Chevy-C50 · 08-06-2017, 06:23 PM

Thank you for the advice. I tried again to bleed the line. The truck does have power brakes and it has a single chamber master cylinder. I think the booster is good considering depressing the brakes while the truck is running is significantly easier. However, the more I use the brakes while its running, it feels like I am losing all brake pressure.

Another thing I found is that the bleeding valves only trickle on the rear wheels, unlike the front two wheels which bleed like a normal vehicle would.

The last question I have is, how common is it for the master cylinder to go out? There is clearly wet spots that build up where the master cylinder meets the booster. Is this a sign of a bad master cylinder? If so, how do I go about removing it?

sweetk30 · 08-06-2017, 10:17 PM

if you cant hold vac in the booster under the cab then you wont get any assist help . then the more you drive it the less brakes you get .

like i said check to see if it holds vac .

08-05-2017, 05:17 PM	#1
68-Chevy-C50 Registered User Join Date: Aug 2017 Location: Minnesota Posts: 2	New to the forums, new to the big truck world. Brakes? I recently picked up a 68 Chevy C50, I have got it running and I am able to drive it around the farm. The problem I am running into is with the brakes. I am able to stop the truck after multiple pumps of the brakes, I attempted to flush and bleed the lines, however, I am only getting a small drip to come out. Any suggestions on how to either fix my brakes in a different way, or solve my bleeding problem? Thanks!

08-05-2017, 11:09 PM	#2
nonstop Registered User Join Date: Dec 2014 Location: Northern California Posts: 422	Re: New to the forums, new to the big truck world. Brakes? Sounds like you might have a bad master cylinder or need to do a thorough bleeding including the master cylinder. Does it have power brakes?

08-05-2017, 11:17 PM	#3
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: New to the forums, new to the big truck world. Brakes? there should be 2 bleader screws on the master/booster under the cab . also 1 on the firewall booster possible . and also check and see if you are holding vac on the booster under the cab . if not this might be a bad check valve . but with out seeing what you have some of this info might be wrong . as there was a few systems . and also if the brake shoes are out of adjsutment or paper thin material then they need adjusted or replaced . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

08-06-2017, 06:23 PM	#4
68-Chevy-C50 Registered User Join Date: Aug 2017 Location: Minnesota Posts: 2	Re: New to the forums, new to the big truck world. Brakes? Thank you for the advice. I tried again to bleed the line. The truck does have power brakes and it has a single chamber master cylinder. I think the booster is good considering depressing the brakes while the truck is running is significantly easier. However, the more I use the brakes while its running, it feels like I am losing all brake pressure. Another thing I found is that the bleeding valves only trickle on the rear wheels, unlike the front two wheels which bleed like a normal vehicle would. The last question I have is, how common is it for the master cylinder to go out? There is clearly wet spots that build up where the master cylinder meets the booster. Is this a sign of a bad master cylinder? If so, how do I go about removing it?

08-06-2017, 10:17 PM	#5
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: New to the forums, new to the big truck world. Brakes? if you cant hold vac in the booster under the cab then you wont get any assist help . then the more you drive it the less brakes you get . like i said check to see if it holds vac . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



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