How does a Hydro Vac work?

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Apr 24, 2004 | 05:06 PM

stangt1

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Joined: Nov 2002

Posts: 14

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From: Madera, PA USA

How does a Hydro Vac work?

Hey all, I have a '79 F600. It has the hydro vac under the passenger floor. I wondered if anyone knew anything about these? If so, let me know. I have several questions on it and I didn't want to bore everybody with a list. Thanks for any info. Brian

Apr 25, 2004 | 02:59 AM

Torque1st

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Joined: Sep 2001

Posts: 30,255

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Find an old Motor's truck repair manual at the library or buy one online. Those manuals cover HD trucks but they are hard to find. They are the best resource I know for those trucks.

Apr 25, 2004 | 10:13 AM

oldhalftons

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Joined: Feb 2003

Posts: 3,439

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From: Spokane WA

Basicly it uses hydralic pressure from the power steering pump to multiply the force from the brake pedal.

vacuum boosters use stored vacuum to help by pulling a diaphram towards the master cylinder. Hydro boost uses pressure to push against the master cylinder. Its used vehicles that are heavy,have low vacuum conditions or are diesel powered.