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Old 08-25-2015, 07:33 PM   #1
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drum brake lines help 86 Allegro

Hi noob here, I just picked up an 86 allegro, with a 454 p30 chassis. The previous owner said the rear drum brakes stopped working so he cut and plugged the rear brake lines The front discs still work fine. Where should I start? Also, in the picture, there is a cut 5/8 hose connected to what looks like a cable and rusted lever. Can someone point me in the right direction?
Thanks in advance
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Old 08-25-2015, 08:21 PM   #2
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The lever and hose looks like it goes to the heater core for the interior of the coach. That's where I would look first.

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Old 08-25-2015, 08:30 PM   #3
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Yup, I agree with Dave, that is the valve to change your climate control hot to cold

Did the PO say why the drum brake didn't work.

What I would do is.

Replace rear brake cylinders, shoes and hardware (springs etc...)

Before hooking up brake line, I would flush the lines, look in the master cylinder and see what it looks like so far as the part for the rear brakes, could be full of rust etc....
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Old 08-25-2015, 08:53 PM   #4
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+1 on all new brake parts plus replace all brake lines front and back including the flex lines. Brake lines are steel and at that age are probably rusted enough to blow out at any time. Better to be safe and the steel lines aren't that expensive.

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Old 08-26-2015, 08:46 AM   #5
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Hey thanks Dave and CJ, I really appreciate your help on this. The PO said the rear brakes "stopped working", I'm not sure exactly by I'm assuming the cylinder ruptured or the lines degraded from what I've been reading about the P30 chassis. I'll do as you suggested, CJ.
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Old 08-26-2015, 08:52 AM   #6
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Agree with just rebuild all of the brake parts in the rear: new wheel cylinders, new hardware, new shoes. Whether you need new hard lines is dependent on the condition of them. At the age you are at, new rubber flex lines both front and rear is advised. Flush with new brake fluid both front and rear. Your parking brake cables may be rusted and inoperable, check them as well while doing all the brake rebuild. All of your parts required should be fairly easy to get, just std GM chassis.

That hose and valve is to cut off hot coolant flow to your heater. I would guess the heater core was leaking, so it was just bypassed. You should see a looped hose on the engine, and another disconnected 5/8 size connection for the other side of the heater core. What goes into heater must come out in order for it to provide heat.
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Old 08-27-2015, 08:57 PM   #7
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Thanks 38Chevy, you guys have helped alot!

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