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  1. #1
    Saab Enthusiast
    Join Date
    30 Jan 2017
    Location
    Trumbull, CT
    Posts
    105
    Saab(s)
    2007 9-5 2.3t
    Thumbs Up:   3

    Brakes - booster or master cylinder?

    My 09 9-5 2.3t has been showing more signs of age lately and may be coming to the end of the line. I have notices on a few occasions lately that when I start the car and begin to move slowly, the brakes don't seem to grab hard and the car is slow to stop. When I get in, the brake is high off the floor. When i start the car, it moves down a bit. When I start to travel in earnest, the brakes return to normal. The first time I noticed this I stopped the car and checked the fluid level. It was full. When I returned to the car the brakes were fine. I am guessing that the master cylinder is failing, but when I look at the WIS I see there is booster. Can this be failing or would they fail together? The odd thing is that once travelling, all seems normal. Anyone have any thoughts?

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  2. #2
    Saab Owner Digger's Avatar
    Join Date
    28 Oct 2016
    Location
    Minneapolis Minnesota
    Posts
    1,122
    Saab(s)
    2006 9-3 2.0t SportCombi
    Thumbs Up:   156
    Yes master cylinders fail, brake boosters will fail and really should flush the brake fluid at least once a decade or so. Fluid flush is the cheapest possible solution to the sound of this problem.

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  3. #3
    Saab Enthusiast
    Join Date
    30 Jan 2017
    Location
    Trumbull, CT
    Posts
    105
    Saab(s)
    2007 9-5 2.3t
    Thumbs Up:   3
    That's definitely worth a try. I've only owned it for 4 years and replaced the rear calipers when I got it. I haven't touched the fronts.

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