Partial Fluid Changes
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Fleet Mechanic
Joined: Jul 2003
Posts: 1,571
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Partial Fluid Changes
I saw on another thread that someone was doing partial fluid changes on their auto transmission. Not sure this is a good idea on transmissions since there is a filter in question, but what about brake fluid, would it eventually mix with the fluid in the wheel cylinders? Also what about power steering fluid, would it be beneficial to pull some of the fluid out at oil changes and replace it? How much Brake and PS should be changed to do some good since nothing tells how much the vehicle holds?
Last edited by Aftrmidnite; Nov 9, 2004 at 07:03 PM. Reason: spelling
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Joined: Jul 2004
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From: Roland, Ar
I have "flushed" P/S pumps before, remove the return line from the pump {becareful the nipple is plastic and is easy to break} and cap off the nipple. Use about 2 feet of heater hose and stick the return line into it and the other end into a milk jug, now start the engine and move the steering wheel a little and all the fluid will come out. Keep adding new fluid until it comes out clean. Now for the master cylinder and brake system, use a clean "turkey baster" and suck all the oll brake fluid from the master cylinder reservoir. Use a lint free rag and clean out the reservoir, refill the reservoir and bleed out the whole brake system from the rear to the front.
Last edited by F150'89; Nov 9, 2004 at 07:54 PM.
Elder User
Joined: Sep 2004
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From: Florida
With the newer ABS controllers I'd be leery of letting the master cylinder get dry and allowing any air into the lines. I just flushed my brakes this weekend. I did the 'drip bleeding' method since I was alone. I sucked out about 3/4 of the master cylinder and filled it with clean fluid. Then I just cracked open the bleeder valves on the wheel cylinders and let them drip and kept topping off the master until the fluid was clean.
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Fleet Mechanic
Joined: Jul 2003
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I was looking for something I could do at oil changes that would be simple, wouldn't have to take any thing apart. Something I could get the benefit of keeping my fluids "new" with the additives and inhibitors functioning.
