Re: Hard brake pedal / no brakes! - Saab 9-3SS Bulletin Board - Saabnet.com
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Re: Hard brake pedal / no brakes!
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Posted by JustinHiFi [Email] (#829) [Profile/Gallery] (more from JustinHiFi) on Mon, 17 Jun 2013 09:11:11 Share Post by Email
In Reply to: Hard brake pedal / no brakes!, B Millar [Profile/Gallery] , Mon, 17 Jun 2013 06:00:12
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Agree with Anders, start with checking the three way brake booster line from the rear of the intake manifold. Saab pn 12847287.

Your symptoms describe a failed brake booster vacuum pump to me. There is an electric vacuum pump in the front passenger fender which turns on during initial warm up when the engine idle is elevated (less intake manifold vacuum to assist brakes). I've replaced a few of them for this symptom, pn 93188647 $595. There is a pump mounted control relay however Saab does not sell this separately. I've traced the fault to the relay in two vehicles, but ended up replacing the entire pump to correct the issue.

You can easily check the pump operation, turn the key on but do not start the engine. Then pump the foot brake, you should hear the electric assist pump turn on. If not, its a bad assist pump.

JustinHiFi

_______________________________________
JustinHiFi
Strictly Saab Inc.
Melbourne, FL

Current:
-1991 900 S-PG MT
-2001 9-5 Wagon AT
-2006 9-3 SS AT

Past:
-1964 96 2-Smoke MT
-1967 96 v4 MT
-1983 900 Turbo MT
-1985 900 SPG MT
-1988 9000 Turbo Black MT
-1988 9000 Turbo White AT
-1990 900 SPG Red MT
-1990 900 SPG Black MT 
-1991 9000 Turbo MT
-1991 900 SPG Red MT
-1992 9000 Griffin AT 
-2000 9-5 Aero Sedan MT
-2001 9-5 Aero Wagon MT
-2008 9-3 2.0T Sedan AT
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