Question about 1989 Ford Mustang
Go under that hood and have someone run the engine in neutral with the emergency brake on and listen for a hiss while they are pushing the brake pedal down, if you hear it look in the direction of the power brake booster...mounted on the rear of the master cylinder....check the approx. 3/8" black rubber vac. hose that plugs into it for a leak and also test the plastic piece the hose slips onto that goes into the booster unit...it is a one way valve and can go both ways causing havoc.
Visually inspect all the vacumn lines for any breaks, cracks or disconnects.
Posted on Aug 08, 2010
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Posted on Jan 02, 2017
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