1. Oldfordisbetter

    Oldfordisbetter New Member

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    Replaced front calipers rotors and pads. Still need to do rears... wile im driving car i hear a constant hissing. When i break it goes away. Let go of breaks and hissing again. Do i need a new booster?
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  2. boostfrk

    boostfrk Active Member

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    Power brake booster test:
    1.) Check engine vacuum you should have 14"-18" of vacuum at 625-750 RPM, 18"-21" vacuum at 1000 RPM.
    2.) Vacuum checks good, start car and run engine up to 1000 RPM for 30 seconds.
    3.) Cut off the engine and then press the brake pedal 3 times. It should get harder to press and travel less each time you press it. If it doesn't, then the brake booster is suspect.
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  3. boostfrk

    boostfrk Active Member

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    One thing to keep in mind...the above may not address a failing booster. Mine is hissing at idle and get worse when I push on the brakes. I've done everything I can think of but I'm at my wits end so I'm just replacing my booster this coming week.
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  4. Oldfordisbetter

    Oldfordisbetter New Member

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    A new booster and master cyl is only $148.....i may have to do mine too...might make it easier when i swap the headers and new head gaskets....
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  5. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor Admin Dude

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    Had to edit the thread title... Was driving me nuts. lol
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  6. Oldfordisbetter

    Oldfordisbetter New Member

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    What was so bothersum about it?
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  7. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor Admin Dude

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    It was spelled wrong. :p
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