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03-21-2008, 08:57 AM
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#1 |
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Registered User
Join Date: Feb 2000
Location: Temple, Texas
Posts: 325
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Brakes?
I recently replaced all my stock rubber lines with braided stinless steel lines. Bled brakes several times but still no brakes. Found a clogged rear wheel cylinder, replaced both, still no brakes. Pluged lines from m/c to check it and no good. Bench bled m/c, reinstalled with lines still plugged, still no good. Had a booster and m/c from 89 burb on the shelf in the shop, so i decieded to make the swap. everything installed and looking much better than the stock setup, plugged lines from m/c and it checks out ok(bench bled it prior to install also). Hooked up brake lines and bled the system several times. I now have brakes but the pedal is very soft. It feels like there are no brakes at all but the truck stops fine. I would prefer a little more stiffness in the pedal. Brakes were fine before I decieded to replace the rubber lines, they were looking pretty bad. Please help, I'm starting to lose my mind.
 '72 1/2 ton disc/drum Thanks |
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03-22-2008, 03:32 AM
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#2 |
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Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: Brakes?
Wish I could help; here's a bump for you though.
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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03-22-2008, 03:56 AM
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#3 |
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Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: Brakes?
how are the hard lines? my 67 has no rear brakes, i have a crack or split somewhere, fluid just pours out of rear when pedal is applied
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'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A |
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03-22-2008, 04:28 AM
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#4 |
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Registered User
Join Date: Feb 2000
Location: Temple, Texas
Posts: 325
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Re: Brakes?
hard lines seem good. I can't find any leaks and I don't seem to be loosing any fluid from m/c. thanks for the bump
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'67 Chevy Longbed Fleetside - Daily Driver(For Now) '72 Cheyene Longbed Fleetside-Daily Driver Best Towing Service |
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03-22-2008, 05:07 AM
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#5 |
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Senior Member
 
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,883
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Re: Brakes?
I'm sure you checked this,but did you adjust the shoes out after drum install?
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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03-22-2008, 06:48 AM
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#6 |
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Registered User
Join Date: Feb 2000
Location: Temple, Texas
Posts: 325
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Re: Brakes?
I did adjust the drums but i'm going to check them again tommorrow. I think one is to tight, drivers side rear wheel locked up yesterday.
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'67 Chevy Longbed Fleetside - Daily Driver(For Now) '72 Cheyene Longbed Fleetside-Daily Driver Best Towing Service |
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03-22-2008, 05:42 PM
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#7 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Brakes?
Just thinking out loud here.
You hooked the master cyclinder back up to the right line right. You may want to bleed them again and maybe flush out the system good if it was clogged up at one point. Any mositure at all will cause all kinds of problems. If the fluid is over a few years old I would flush it good.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71  Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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03-22-2008, 06:00 PM
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#8 |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Brakes?
If brakes feel mushy but still stops you could still have some air in the system somewhere. You may have air in the front or rear sides. Not enough to prevent you from stopping but enough to feel mushy.
Here's a simplified site on how stuff works describing what I'm referring to. I like to use it because it has pretty decent graphics. If you scroll down and click the red arrow, you can see that a leak (as in this case) or air may allow extra travel of the primary piston. http://auto.howstuffworks.com/master-brake1.htm Another possibility is that the master cylinder primary piston is allowing some fluid to flow back into the the reservoir past the seal. I've had to replace new master cylinders several times before finding a good one. In one case, I finally asked for my money back and went to a different auto parts and got a different brand. Forgot to add... This was on one of my newer trucks not my 68 or 69... But still could apply. Last edited by 68gmsee; 03-22-2008 at 06:02 PM. |
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03-22-2008, 06:03 PM
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#9 |
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Registered User
Join Date: Jul 2007
Location: Lakeland, Fl
Posts: 101
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Re: Brakes?
Have you checked the Proportioning Valve? Had a similar problem and the Proportioning Valve fixed it .
Good Luck Eddie47
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