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Jul 21st, 2025 | | | | Joined: Oct 2014 Posts: 29 New Guy | | New Guy Joined: Oct 2014 Posts: 29 | Well, thanks to your help I managed to get to the wheel cylinders and rebuilt them with new kits. I honed them out and they seemed to be in decent shape. I put it all back together and bled the entire system and I still have low pressure in the rear. My fronts squirt fluid out like they should. I have all new flexible hoses. I can only guess that the cylinders were not clean enough and air is getting by somehow? The pedal is mushy even though the cylinders are moving. I should mention i was testing this with the rear drums off. Could that cause this? My final guess is the adjusters are not correct. Sorry for the short sentences and im sure theres some misspellings; currently on my phone typing. Thanks in advance. Working on a 46 chevy 2 ton if that matters! | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Put the drums back on and adjust the shoes properly. All the resistance you have against the rear wheel cylinders right now are the shoe return springs, and they won't allow much pressure to build up. With the shoes against the drums several hundred pounds of pressure can build up in the lines.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Jan 2013 Posts: 603 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 603 | Yep, aint gonna work with the drums off. Its lucky you have not squirted the wheel cylinder push rods out of the cylinders.
57 GMC LCF 370 55 John Deere 40-W 59 John Deere 430-W 2000 GMC 4x4 56 John Deere 420-W Pix on Photobucket | | | | | Joined: Apr 2005 Posts: 1,971 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,971 | Before you put the drums on, check the adjustors and realize which way they turn to expand the shoes. Put the hubs on and poke a screwdriver through the back of the backing plate and turn the expander screw tighter until the shoe drags. Back it off "just enough" so the shoes don't drag when you turn the hub. Then bleed your brakes. | | | | | Joined: Jan 2011 Posts: 237 'Bolter | | 'Bolter Joined: Jan 2011 Posts: 237 | this happened to me when i was trying to find a leak on my 38, i took off the drums and pressed the brakes and sure enough the drivers front came off. dont test it like this. i then put it back together, bled it, and tested it with the drums on BUT they needed adjustment so i adjusted to have a drag | | |
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