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Old 09-03-2014, 01:43 AM   #1
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Mushy Brakes after "fix"

Hello!
So, I got my car"fixed" here in Guam. There are no reputable shops at all and the available ones are miserable, and I don't physically have the time to work on it. I needed to replace my old calipers and did so through a local place. After replacing them, they couldn't get pressure on the pedal. So they bled and serviced about 5 times and the problem got worse, by the end the pedal would go to the floor and stay there. Some of the parts were old and I decided to replace them. I had the booster and master cylinder replaced, assuming that would help and fix it too. They then had issues with the proportioning valve as it was coated in Teflon for some reason. So they machined a fix. They said it was done and I just wanted it out of their shop so they couldn't make it worse. Now the brake pedal goes about halfway down with no pressure, then to nearly the floor with normal-ish but quite mushy pressure. Maybe a bad bleed but I don't think so. It is not leaking. Any suggestions or help? Maybe something simple or am I just screwed? Could it be the calipers? Thanks very much!

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Old 09-03-2014, 02:05 AM   #2
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Either they didn't bleed the brakes or the calipers are on upside down and the bleeder valves are below the brake line input on the caliper instead of above it. Air will be trapped inside

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Old 09-03-2014, 02:05 AM   #3
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From my limited experience- You didn't mention bench bleeding of the master cylinder, something I did when I replaced mine. No leaks, so there is either air still in the lines, the brake lines are old and ballooning, or my bet is something they did with the proportioning valve. I have not dealt with the proportioning valve before, but the name implies to me a hydraulic valve or port with a precision diameter orifice which may have been altered in the machining process...(I'm really just guessing on the valve).
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Old 09-03-2014, 02:12 AM   #4
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Quick Google of "Jeep brake proportioning valve" brought lots of info that seems to match your description, several Wrangler Forum threads also listed.. good luck.
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Old 09-03-2014, 02:41 AM   #5
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Is there a way to tell visually if the calipers are on upside down? The brake lines are new and are not ballooning to the best of my knowledge. Before taking it in for this "Fix" I had fantastic brake pressure, and a tight response. I am pretty frustrated, and it is only safe to drive over here, thanks to the fact that 35MPH is the fastest speed limit on the island. I thought about the proportioning valve, but would that make the pedal mushy?
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Old 09-03-2014, 02:56 AM   #6
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I also took a look under the car. On the passenger side, the brake line is hard mounted to the frame, on the drivers side, it is not, the bracket is not attached to anything. Could this be contributing? The lines are new.

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