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08-20-2018, 04:40 PM
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#1 |
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Registered User
Join Date: Aug 2018
Location: suffolk
Posts: 1
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6400 Brake problem
Hi All, I have a 6400 (1947) I have replaced for new all wheel cyls, and the master cyl and brake pipes, had the hydro off and still cannot work out why the system is loosing pressure, can anyone help with any peculiarities for the big trucks. thank you.
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08-28-2018, 10:21 PM
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#2 |
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Registered User
 
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,656
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Re: 6400 Brake problem
I suggest making a pressure bleeder to bleed the brakes with. One of the very few rigs I ever had serious problems getting the brakes bled on was one similar to that.
I don't know what they call them in the UK but a pressure bleeder can be made out of a 1 gallon weed sprayer from the hardware store. This link has some real simple instructions on how to make one that has little or no frills. You do need a proper cap that will fit your master cylinder or figure out how to make a cap you can clamp on top of it.
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Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. |
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03-01-2020, 06:31 PM
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#3 |
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Registered User
Join Date: May 2010
Location: Des Moines, IA
Posts: 46
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Re: 6400 Brake problem
What link Mr48? Thanx
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Genesis 1:1 - Revelation 22:21 🙏 '72 GMC C1500 Wide Side Sierra Grande '77 Chevy C20 CCLB (went to go get it 4/29/19!!!) '96 Chevy K2500 Ext cab '97 Chevy K1500 Tahoe (I gotta stop lookin' at CraigsList when I'm bored!) '57 Chevy 6400 (coolest piece yet  )
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03-11-2020, 10:49 AM
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#4 |
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Registered User
Join Date: Feb 2012
Location: So. Cali.
Posts: 2,658
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Brake Bleeding
I too am a big proponent of pressure bleeding brakes and hydraulic clutches...
The main thing is to not use too much pressure . An oldie only need 3 ~ 5 PSI ~ more than that and you're risking a brake fluid bath . ? Where is the system loosing pressure ? . Brake pedal sinks to floor upon application or leaks or what ? . If you can afford it a Motion Pro (I *think*) is good and only $50 new, cheaper at the pawn shop or on craigslist...
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-Nate Geezer '49 3100 235 W/ Muncie SM420 SOLD '69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH 
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