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Old 04-18-2013, 02:12 PM
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No brakes and peddle is solid

I have a mud truck that has no rear brakes, just front. I have the rear blocked off with a plug and the front is bleed and hooked up. It is a 94 s10 blazer master cylinder with 80's 3/4 ton front calipers. Calipers and lines are new The brake peddle is solid as a rock and will bleed but there's no brakes. Is there a certain way to block off the rear with out this happening? I think it must be doing this because of the rear being plugged off.
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Old 04-18-2013, 02:17 PM
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Here's another picture of it. The plug is the one closest to the firewall
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Old 04-18-2013, 09:20 PM
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Anyone? ?
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Old 04-18-2013, 09:30 PM
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Why would you block off the rear brakes..
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Old 04-18-2013, 09:40 PM
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Because there is no lines, wheel cylinders, shoes. Nothing but the drums in the rear. It's just a mud truck.
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Old 04-18-2013, 09:42 PM
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With the back blocked off, there is nowhere for the fluid to go - the hard pedal you have is the pressure between the piston in the back half of the master and the plug.
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Old 04-18-2013, 09:44 PM
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Do you think i could remove the plug and run a line y'd off to the other line?
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Old 04-18-2013, 10:28 PM
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I would bypass the combination valve completely and plumb a line from one port of the master cylinder to one front caliper, the other master cylinder port to the opposite caliper. Or, install a single reservior master cylinder and plumb the lines from the caliper into a "T" and to the port of the master cylinder.
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Old 04-19-2013, 10:20 PM
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Ill try that. Thanks
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Old 04-20-2013, 07:47 AM
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Most GM disc brake master cylinders have the front system closest to the firewall. Maybe you blocked the wrong port? Can't tell from your pic, so pop the cap and look at the reservoirs. The larger one is the front brake supply. As stated, remove the prop valve and plumb direct to the fronts...

Russ
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