Instead of trying to tell you the master cylinder is directly opposite of the brake pedal on the engine-side of the firewall - and the fluid goes there...
I'll suggest you download the Owners Manual and refer to the *illustrated* instructions there.
See "Related Questions" below for links to free Owners Manual download sources.
On a 1996 Mercury Sable : The automatic transaxle ( transmission ) fluid level dipstick is near the firewall and the brake fluid reservoir ( looking from the FRONT of the vehicle it is to the left of the reservoir )
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On a 1996 Mercury Mystique : The brake fluid reservoir is also the clutch fluid reservoir
According to the 1996 Mercury Grand Marquis Owner Guide : ( DOT 3 brake fluid , meeting Ford specification ESA-M6C25-A )
On a ( 1996 ) Mercury Tracer : The brake fluid reservoir also is the clutch fluid reservoir and it takes : ( DOT 3 brake fluid meeting Ford specification ESA-M6C25-A )
According to the 1996 Mercury Cougar Owner Guide : ( DOT 3 brake fluid , meeting Ford specification ESA-M6C25-A )
YOU NEED NEW CALIPERS . THEY ARE STICKING
According to the drawing in the 1996 Mercury Sable Owner Guide : The fuse panel is under the dash by the brake pedal Also , the Power Distribution Box ( which is " live " ) is located in the front of the engine compartment , near the battery
The 1996 Mercury Sable the OBD 2 connector is under drivers dash next to kick panel
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( fuse # 21 ) is a 20 amp fuse for the cigarette lighter on a 1996 Mercury Sable
The most common cause for a 1996 Mercury Sable not starting is a dead battery. The second most common cause for the automobile not to start is a lack of fuel.