Cougar/XR7 V8-4.6L VIN W (1997)
water-soluble.
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Refill brake master cylinder reservoir and bleed system.
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Apply the brakes several times.
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Examine the system to verify that the brake master cylinder reservoir fluid level is actually dropping.
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Locate and correct the external leak.
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If fluid level drops and no external leak can be found, perform the bore end seal leak test. See: Bore End Seal Leak Test