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Old 11-25-2005, 05:02 PM
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Now What?

This is the list of everything I`ve replaced brake wise on my 86 Olds cutlass.
Master Cylinder, rear cylinders, rear shoes, rear hubs, combo valve, front bleeder valves. Front rotors and calipers are fine. I just finished installing the combo valve, it`s a new GM unit. The car still has little brakes, I`ve bled them until hell wouldn`t have them all the way around 4 times, used synthetic fluid, the pedal goes almost to the floor before it stops, it stops okay, but it`s still not right, there isn`t any leaks in the system, anyone else have any other ideas? the pedal should start stopping long before it does and I dunno where else to look. any help is appreciated.

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Old 11-25-2005, 06:20 PM
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Are the rear shoes adjusted properly? You can do a quickie check with the emergency brake. If they stop about half way to the floor or less, the adjustment is probably not an issue. If they go straight to the floor or close to it I would look at shoe adjustment.

It's often the little overlooked things that'll bite ya'. For example here a while back I was at work and the guy in the next bay was having a no pedal problem with a new brake job. After a good while he asked me if I'd have a look. The pedal felt mushy like air in the system, but he swore to me there's no air in the system (with all the bleeding he did there shouldn't have been). So I take a quick look at all he touched doing this job and noticed he had the calipers on the wrong sides. With'em on the wrong sides the bleeders were at the bottom and wouldn't let any air escape. Boy did I ever razz him about that one for a long time afterwards........
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Old 11-29-2005, 02:54 PM
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now what

As mentioned, it can be a silly thing. Just for grins, did the replacement MC match the old one exactly in the cup depth for the pushrod? Did you change the pushrod length by chance?
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Old 11-30-2005, 06:50 PM
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An 86 Olds may just have a "quick take-up mastercylinder" Which is a high volume mastercylinder. It is identified by half of its bore being significantly larger than the other half. It also has an upward rake to it under the hood. Look into the resivoir when you are bleeding it. Does a mass of tiny bubbles appear every time you pump the pedal? If they do appear, then you have a qtu master cyl. If you do have this type, then you need to go through a special bleeding procedure. If you use the standard bleeding techniques, then you will not get any pedal. Check the type through your local dealer, and then post whether you have this type or not.
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Old 12-01-2005, 07:15 PM
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Did you replace the flexible lines?
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