Question about 1991 Mercury Cougar

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My ex wife put power steering fluid in the brake master cylinder and drove the car across town..... what should i do

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Immediately **** out the contents of the master cylinder, replace with fresh brake fluid, and flush the system.

Flushing can be done by doing a good old fashioned manual bleeding consisting of one person opening and closing the bleeder screws and one person working the brake pedal or many shops will have a brake flush machine that will make quick work of the job.

The P/S fluid in the brake system will cause the seal to bloat and eventually fail. We see several cars every year that this happens to. If its caught early a system flush will take care of it. If ignored everything gets replaced (master cylinder, brake hoses, calipers, and wheel cylinder). We have had a few over the years that where ignored for so long that the brakes eventually locked up.

I’m happy to assist further over the phone at

Posted on Sep 30, 2010


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The slash that you placed between the words steering/brake have me concerned. I certainly hope you did not think that these two systems are co-joined? The power steering system is a hydraulic system completely separate and isolated from the brake system. They also use two completely different types of fluid. Putting brake fluid in the power steering system would destroy it just as putting power steering fluid in the brake master cylinder will destroy it. The type(s) of rubber used in the seals for each of these systems demands they use their own fluid. Any cross-contamination will require a complete draining, cleaning, and replacement of ALL rubber components and seals. This would include the power steering pump and rack for the power steering system, and for the brake system the master cylinder, all calipers and wheel cylinder as well as the proportioning valve. If there is an ABS unit, it will need serviced as well.

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I accidentally put power steering fluid in my master cylinder. What should i do?

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I need to top up the power stering fluid and need to know what tipe to use 1988 chevy silverado C3500 454 The power steering looks like it is incorperated into the brake booster

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73b4b95.jpg To top off steering fluid, use standard steering fluid.

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Location of the brake fluid input

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Sounds like she has a bad power brake booster/master cylinder. The master cylinder is leaking fluid into the brake booster which is sucked into the intake and burned which causes the smoke. Put a new booster and master cylinder on, and problem will be fixed.

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