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Old 09/25/2017, 05:44 AM   #1 (permalink)
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Caliper Grease in Brake Lines?

So, I did something stupid. I was swapping out the flex lines on my brakes and decided to use caliper grease on the inside and outside of the flare on the hard line (thought it would make it go together easier). Turns out you're not supposed to use any petro-based grease on the inside of brake systems. Put about 100 miles on the car since then and the brake feel spongy now (they didn't initially after I put everything together).

Not sure if I can flush out the brake lines without tearing everything apart, or if I need to plan on doing an entire rebuild of the system to replace seals and what-not?
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Old 09/25/2017, 06:57 AM   #2 (permalink)
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Best thing to try would be to flushing the entire system. Doesn't take much effort and hope for the best. If it was me, I would take this opportunity to redo everything, and upgrade.. Brakes are not something I chance.
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Old 09/25/2017, 05:57 PM   #3 (permalink)
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Likely going to have to rebuild the calipers. Flushing isn't going to get particulates out of their resting places since they do not raise like air bubbles.
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Old 09/29/2017, 06:03 AM   #4 (permalink)
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Yeah, I figured I'd have to rebuild the calipers (I rebuilt them a few years ago, so it should be pretty easy). Do you think the grease I used would've dissolved in the brake fluid and made its way up the lines into the ABS unit and the master cylinder?
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Old 09/29/2017, 08:41 AM   #5 (permalink)
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What grease exactly did you use and are you sure it's not OK? Some greases are sold for the job. You have to get into what they are made of to know for sure. There's a chance you are actually fine.

Either way a soft pedal says you need to bleed. I'm just curious what grease you used as far as whether you need to rebuild the whole thing. Maybe, maybe not.

You could also take some of your grease and put it in a small cap or something that has brake fluid in it as well. Let them hang out for a day. See if the grease clumps up or dissolves - some lubricants will dissolve. I'm not sure exactly which ones, or if it was intentional by the manufacturer or a freaky accident, but some will do it. In that case a flush may be enough.
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Old 09/29/2017, 12:10 PM   #6 (permalink)
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Quote:
Originally Posted by tracer bullet View Post
What grease exactly did you use and are you sure it's not OK? Some greases are sold for the job. You have to get into what they are made of to know for sure. There's a chance you are actually fine.

Either way a soft pedal says you need to bleed. I'm just curious what grease you used as far as whether you need to rebuild the whole thing. Maybe, maybe not.

You could also take some of your grease and put it in a small cap or something that has brake fluid in it as well. Let them hang out for a day. See if the grease clumps up or dissolves - some lubricants will dissolve. I'm not sure exactly which ones, or if it was intentional by the manufacturer or a freaky accident, but some will do it. In that case a flush may be enough.
I used one of those little brake grease packets they sell at the counter at autozone, I think it was this one: https://www.ipdusa.com/products/4686...e-14-oz-packet
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