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02-26-2025, 12:48 PM
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#1 |
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Senior Member
 Join Date: Jun 2021
Location: West milford nj
Posts: 343
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Disc brake issue
I have a 4 wheel disc brake conversion on a 70 c20. After pressing the brake pedal and releasing i can't spin wheels freely, especially the fronts. I unbolted the master cylinder and it didn't free up the wheels so it's not the rod length. If I open the bleeders it frees up the wheels but still takes an effort to turn them. M/C is new with a hydroboost .
Any thoughts ?  
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Yesterday, 12:27 PM
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#2 |
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All about them K’s
 
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,576
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Re: Disc brake issue
Does it still have the drum brake residual pressure valves plumbed in the lines? They are basically small check valves in the lines that hold a small amount of pressure on the drum system wheel cylinder to keep the shoes on the drum and minimize brake pedal travel.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s |
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Yesterday, 01:27 PM
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#3 |
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Registered User
Join Date: Aug 2006
Location: LaSalle Mi
Posts: 531
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Re: Disc brake issue
Bad brake hose?
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Yesterday, 06:22 PM
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#4 |
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Registered User
Join Date: Feb 2011
Location: Under the Truck Dreaming
Posts: 782
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Re: Disc brake issue
sub'd
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72 K20 Custom Camper, D60, 14BFF, full roller 406 TPI w custom built ECU and yes..it has tow hooks...and a 5 speed |
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