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Join Date: Sep 2010
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Brake booster vacuum supply?

What vacuum pressure is nominal on 944 turbo brake booster supply? My vacuum gauge reads 10 psi at inlet to booster.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman.

Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved.
Old 09-29-2018, 08:23 PM
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10psi "vacuum" is ~20 inches which is very good.
Old 09-30-2018, 05:57 AM
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Sorry rocket so you're saying that 10PSI is very good?
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman.

Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved.
Old 10-01-2018, 07:27 AM
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-10psi is good.

Unless you really have 10psi positive pressure, in which case your brakes won't work.
Old 10-04-2018, 09:30 PM
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Well, that helps me diagnose my braking issue. Booster and check valve on the vacuum input line appear functional. Solid break pedal pressure, very little brake effectiveness. New Zimmerman rotors and Hawk pads, what I thought was a thorough fluid replacement/bleed of the system but it just isn't braking well. I wiped the coating off the rotors before installation and after driving around for about 100 miles, it doesn't seem the brakes are "bedding in". These calipers have two bleed nipples and I'm wondering if I may have screwed the bleeding procedure because of that. Can't autocross it this way.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman.

Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved.

Last edited by mytrplseven; 10-09-2018 at 07:00 PM..
Old 10-09-2018, 06:57 PM
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