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Old 09-13-2013, 06:49 PM   #1
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Power steering fluid in my break lines

I accidently put power steering fluid in my brake lines and didn't even realize until my brakes went out on me yesterday... I was able to get it home and have bled the breaks once and the pressure to the peddle seems to be better but i am still getting the warning lights... I am about to bleed it again but does anyone know of something else I could be doing? And what may need to be replaced?

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Old 09-13-2013, 06:59 PM   #2
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Your brake light being on probably has more to do with the way you're bleeding your brakes than having ps fluid in the system. Your best bet IMHO would be to take it to a shop and let them do a complete flush and power bleed. You may want to pull your rear drums and see if you have a leaky wheel cylinder first.

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Old 09-13-2013, 07:01 PM   #3
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Fortunately they are both hydraulic fluid.
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Old 09-13-2013, 07:32 PM   #4
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Your brake light being on probably has more to do with the way you're bleeding your brakes than having ps fluid in the system. Your best bet IMHO would be to take it to a shop and let them do a complete flush and power bleed. You may want to pull your rear drums and see if you have a leaky wheel cylinder first.
What do you mean by it could be the way we are bleeding the breaks... Is there something special we should be doing
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Old 09-13-2013, 07:35 PM   #5
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Another thing I'm noticing is that when bleeding the front brakes the peddle goes in super far... Is this normal?
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Old 09-13-2013, 07:54 PM   #6
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If your brake light is on, it means there was higher pressure on either the front or back that caused the pressure differential valve (pdv) to move to the low pressure side. With the valve moved to that side it will shut off or restrict brake fluid to the end of the Jeep that had the low pressure situation. This normally happens when you blow the seal in a wheel cylinder or caliper, but can also happen when bleeding brakes. That's why I suggested for you to check your wheel cylinders for leaks. While both power steering fluid and brake fluid are hydraulic, I'm not 100% sure that the seals in your brake system are compatible with steering fluid.

If the pdv was pushed over by bleeding and there are no leaks in the system, have someone sit in the driver's seat with the key turned to "on" and have them push down on the brake pedal as you crack the bleeder valve on one of the back wheels. When the light goes out, shut the bleeder valve. If the light never flickers or goes out, try the same thing on one of the front wheels.
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Old 09-13-2013, 09:04 PM   #7
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I think you should fully swap your fluid right away. Many years ago I put power steering fluid in my toyota PU. The fluid ruined the master cyl seals. As I drove I would feel the brakes being applied, but not by me. The tires would lock up. I bled system, and I could go for awhile. Then I had to do that again. At this point I didn't know what was wrong. I ended up needing a new master cyl and all was well. I checked when I got home and new it was my fault.
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Old 09-13-2013, 09:06 PM   #8
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I have flushed my brake system 3 times... It seems now if I push the brakes hard they work normal but if I push the pedal slowly the pedal will go further and the light will come on... Then if I push the pedal fast again the light will turn off
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Old 09-13-2013, 09:10 PM   #9
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If problem remains, look at master cyl 1st.
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Old 09-14-2013, 05:08 PM   #10
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Ok update... I installed a new master cylinder and that seems to have fixed the problem but now my brake light stays on... The push rod looks like it's nt pushing back far enough... Any thoughts?
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Old 09-14-2013, 06:02 PM   #11
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Old 09-14-2013, 09:32 PM   #12
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Most brake fluids are a non-mineral hydraulic fluid ( there are synthetic brake fluids available but their not normally used in Jeeps ) Power Steering fluid is almost always a mineral based hydraulic fluid even the ATF types. A mineral based oil will attack the rubber components used in your brake systems master cylinder, combination valve, ABS valve if equipped, brake calipers, wheel cylinders and all hoses.
These rubber components will swell either locking up your brakes or causing leaks, flushing very seldom cures the damage already done you'll most likely wind up replacing all the above components before it's over with.
Your system is contaminated and brakes are not a good thing to half way fix.
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Old 09-14-2013, 11:05 PM   #13
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Agree with flflash. Brake fliud is Hydraulic fluid, and is hygroscopic-meaning it will absorb water out of the air. Power steering fluid is mineral or synthetic the same for ATF and is NOT compatable- at least not in the yeras past. Unless something has changed over the years ,you probably will have to replace all rubber parts in the master cyl, wheel cylinders, quad rings in calipers. They most likely eventually swell up and may lock your calipers up. Completely different rubber compound. Want proof? pour some ATF fluid OR power steering fluid in a jar, drop some wheel cylinder rubber parts in-wait (2) days . The cups/rubber brake parts will be swole up- bigger around. Ever notice how you can wash brake fluid off anything completely with water? can't do that with ATF or PS fluid. Also FYI hydraulic brake FLUID is NOT the same as hydraulic OIL.
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Old 09-15-2013, 10:58 AM   #14
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Quote:
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Most brake fluids are a non-mineral hydraulic fluid ( there are synthetic brake fluids available but their not normally used in Jeeps ) Power Steering fluid is almost always a mineral based hydraulic fluid even the ATF types. A mineral based oil will attack the rubber components used in your brake systems master cylinder, combination valve, ABS valve if equipped, brake calipers, wheel cylinders and all hoses.
These rubber components will swell either locking up your brakes or causing leaks, flushing very seldom cures the damage already done you'll most likely wind up replacing all the above components before it's over with.
Your system is contaminated and brakes are not a good thing to half way fix.
Yep, you and the other gent nailed it. If you contaminate the system with anything that is conventional oil based or similar and that includes some of the other brake fluids that are not compatible, you should replace every single piece of it that has a seal or rubber component in it including the calipers and wheel cylinders. It may not die immediately, but it will die.
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Old 09-15-2013, 11:00 AM   #15
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Agree with flflash. Brake fliud is Hydraulic fluid, and is hygroscopic-meaning it will absorb water out of the air. Power steering fluid is mineral or synthetic the same for ATF and is NOT compatable- at least not in the yeras past. Unless something has changed over the years ,you probably will have to replace all rubber parts in the master cyl, wheel cylinders, quad rings in calipers. They most likely eventually swell up and may lock your calipers up. Completely different rubber compound. Want proof? pour some ATF fluid OR power steering fluid in a jar, drop some wheel cylinder rubber parts in-wait (2) days . The cups/rubber brake parts will be swole up- bigger around. Ever notice how you can wash brake fluid off anything completely with water? can't do that with ATF or PS fluid. Also FYI hydraulic brake FLUID is NOT the same as hydraulic OIL.

Yep, I tell folks all the time in the driveway when they spill brake fluid that the perfect solvent for it is plain ole water. Kudos for the correct use of hygroscopic to you.

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