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#1 |
Senior Member
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Location: tyler texas
Posts: 1,537
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C-50 Brakes
What is the process for bleeding brakes on the dual master cylinder setup? Thanks
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NHRA Super Street 469C It only runs 10.90 at 156 mph |
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#2 |
Moderator
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Location: Cabarrus
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Re: C-50 Brakes
What year?
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Alex 1967 C50 292ci Lumber truck 1967 C50 292ci Dump truck 1967 C60 366ci Fire truck |
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#3 |
Senior Member
![]() Join Date: Mar 2008
Location: tyler texas
Posts: 1,537
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Re: C-50 Brakes
1969 350 4-speed Truck. Small cylinder up top with another cylinder and booster behind the drivers side step.
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NHRA Super Street 469C It only runs 10.90 at 156 mph |
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#4 |
Senior Member
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Location: Los Angeles
Posts: 1,328
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Re: C-50 Brakes
When you say dual master cylinder, do you mean there are 2 lines coming out of the firewall mounted master cylinder? If so those systems often have 2 boosters. If there is just one line coming out of the firewall mounted master cylinder and it goes to one booster, that is a single system. That is what most C-50's had. The way to bleed the single system is master cylinder first, then booster, then right rear-left rear-right front-left front wheels. Then master cylinder and booster again. You may have to do this multiple times, you will loose a lot of brake fluid and you have to be careful not to let the master cylinder run dry. It is quicker to use a pressure bleeder if you can get one.
Now for the disclaimers: Do not mess with medium/heavy truck brakes unless you know what you are doing. Seek professional help if in doubt. Do not bleed the brakes in an old truck that has been sitting and attempt to drive it unless you pull all the drums and thoroughly inspect the wheel cylinders for leakage. Also inspect all lines, master cylinders and boosters. Check for vacuum leaks and be sure the booster is functional. Do not attempt to drive the truck unless you are sure of the condition of the brakes. Also make sure the emergency brake is functional. If a single system has a leak it is surprising how quickly the brakes will cease to function. Don't mean to be offensive, just don't want to see anyone have an accident. Over on one of the Ford forums some clown lost an F-600 down a hill after he messed with the brakes! Luckily he didn't kill himself or someone else.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. |
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#5 |
Senior Member
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Location: tyler texas
Posts: 1,537
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Re: C-50 Brakes
Bob thanks for explanation. It's a single up top. You will in no way be held accountable for you advise. It's probably leaking everywhere.
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NHRA Super Street 469C It only runs 10.90 at 156 mph |
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#6 |
Registered User
Join Date: May 2015
Location: Montana
Posts: 3,696
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Re: C-50 Brakes
That sounds just like the one I had (1965).
I put in an electric trailer brake tee to tow a MH and it was never quite right after that. So I took the tee and controller off and bled the system again and again. It would be fine sitting for any length of time or going downhill but it would somehow bleed off when going uphill under a load. If I had to stop going uphill, I learned to pump up the brakes before putting in the clutch. Funny, it never lost fluid either ![]() To add insult to injury, the brakes on our old MH never worked either - so it was a waste to break into the system for the controller. I should have just hooked up the wires and used it by hand though it wouldn't have done any good anyway.
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Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner |
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