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11-16-2014, 10:52 AM
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#1 |
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Registered User
Join Date: Feb 2011
Location: Provost, Alberta, Canada
Posts: 68
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Brake issues!!!
I'm having issues bleeding the brakes on my 86 1/2 ton wrangler. I got the back brakes to bleed and when I went to start in the front once they got a bit of fluid they lock up and don't seem to want to unlock. I've changed the master cylinder and the proportion valve on the frame and it doesn't seem to have helped and I've even taken the calipers off and pushed the piston back in and they don't take much effort to push back into place. I don't think it could be the calipers as both sides lock up. Any advice would be greatly appreciated.
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1986 Chevy Silverado LWB (project) 1967 Chevy SBSS (future project) 2003 Chevy Tahoe (wifes daily) 2004 GMC 2500 Duramax (company truck) 1986 GMC Wrangler LWB (newly acquired beater) 
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11-16-2014, 11:14 AM
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#2 |
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Registered User
Join Date: Dec 2011
Location: Regina, SK, Canada
Posts: 622
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Re: Brake issues!!!
Calipers can get sticky and not release. Rust and heat can cause them to run tight and not release. I would assume that is the issue, as you mentioned both sides that is odd but not out of the realm of possibilities. I have had to brush an file to fix this in the past or calipers are cheap to replace.
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1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4 |
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11-16-2014, 11:17 AM
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#3 |
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Registered User
Join Date: Feb 2011
Location: Provost, Alberta, Canada
Posts: 68
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Re: Brake issues!!!
Ya it's just weird that when I had them out on the bench the piston compressed without much effort and when I put it back on the slides were loose even.
__________________
1986 Chevy Silverado LWB (project) 1967 Chevy SBSS (future project) 2003 Chevy Tahoe (wifes daily) 2004 GMC 2500 Duramax (company truck) 1986 GMC Wrangler LWB (newly acquired beater)
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11-16-2014, 11:31 AM
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#4 |
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Registered User
Join Date: Apr 2014
Location: PR
Posts: 85
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Re: Brake issues!!!
Clogged brake lines??
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11-16-2014, 11:48 AM
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#5 |
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Registered User
Join Date: May 2013
Location: Houston Texas
Posts: 713
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Re: Brake issues!!!
I had a similar problem one time, the brake bleed screw was totally clogged with rust and crap!
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11-16-2014, 11:51 AM
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#6 |
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Registered User
Join Date: Feb 2011
Location: Provost, Alberta, Canada
Posts: 68
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Re: Brake issues!!!
I know they aren't clogged because I've got some brake fluid coming out. Would the proportion valve be causing issues?
__________________
1986 Chevy Silverado LWB (project) 1967 Chevy SBSS (future project) 2003 Chevy Tahoe (wifes daily) 2004 GMC 2500 Duramax (company truck) 1986 GMC Wrangler LWB (newly acquired beater)
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11-16-2014, 01:42 PM
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#7 |
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Registered User
Join Date: Apr 2014
Location: PR
Posts: 85
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Re: Brake issues!!!
By previous experience, I noticed that a semi clogged brake line can let fluid in, due to the high pressure applied by the hydraulic system as you push the pedal, but it's not so free as to let fluid return back by itself. If you disconnect the line/s from the caliper, can you see it dripping fluid by gravity? it should.
Bruno |
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11-16-2014, 11:04 PM
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#8 |
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Registered User
Join Date: Feb 2011
Location: Provost, Alberta, Canada
Posts: 68
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Re: Brake issues!!!
Well it's for sure one clogged line on the passenger side and I'm not sure about the caliper but I think I might put new ones on anyways and then every base is covered I guess.
__________________
1986 Chevy Silverado LWB (project) 1967 Chevy SBSS (future project) 2003 Chevy Tahoe (wifes daily) 2004 GMC 2500 Duramax (company truck) 1986 GMC Wrangler LWB (newly acquired beater)
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11-17-2014, 09:36 AM
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#9 |
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Registered User
Join Date: Jul 2011
Location: WV
Posts: 946
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Re: Brake issues!!!
I have had the inner liner deteriorate and cause issues. They can get a "flap" and shut off the flow of fluid. Loosen the line at the entrance of your rubber lines on the front to see if you are moving fluid well to that point.
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72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold  70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD |
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11-17-2014, 09:45 AM
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#10 |
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Registered User
Join Date: Feb 2011
Location: Provost, Alberta, Canada
Posts: 68
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Re: Brake issues!!!
Yeah I un did both ends of the steel line and blew through it fine just that stupid rubber line causing all my issues I think and a calliper because even unhooked it wouldn't release and had to pry it off
__________________
1986 Chevy Silverado LWB (project) 1967 Chevy SBSS (future project) 2003 Chevy Tahoe (wifes daily) 2004 GMC 2500 Duramax (company truck) 1986 GMC Wrangler LWB (newly acquired beater)
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11-20-2014, 01:35 AM
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#11 |
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Registered User
Join Date: Feb 2011
Location: Provost, Alberta, Canada
Posts: 68
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Re: Brake issues!!!
Does anyone know what style of brake system it would have? Jb?
__________________
1986 Chevy Silverado LWB (project) 1967 Chevy SBSS (future project) 2003 Chevy Tahoe (wifes daily) 2004 GMC 2500 Duramax (company truck) 1986 GMC Wrangler LWB (newly acquired beater)
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