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  #1  
Old 06-18-2004, 11:13 AM
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Location: Alexandria, Virginia
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Weird Volvo Brake Problem!

A friend has a '97 Volvo 850 wagon with ABS.
Her brake pedal has developed a somewhat mushy feel but will 'pump up' more solid. Not scary but definitely not the firm pedal feel I expect from an expensive European car. No visible loss of brake fluid or leaks. Bleeding the rear brakes restores a firm pedal for awhile but after a few weeks or months the brakes are mushy again.
Any opinions or suggestions?

Thanks, Mark

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Old 06-18-2004, 11:34 AM
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It's probably the master cylinder and more specificaly the seals on the primary piston (it would act differently if it was the secondary piston). This is fairly common on the B5254/34 engine configurations. You can get a new Teves replacement for $200.
Double check for visible leaks elsewhere before making the investment.
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Old 06-20-2004, 03:19 AM
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If you put heavy pressure on the pedal and it slowly goes down all the way down it's time for a new master cylinder. I don't see why master cylinders are so expensive for MB's and volvos as they should be a simple part to manufacture.........

William Rogers.......
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Old 06-20-2004, 11:20 AM
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It's not a sinking pedal, just a mushy one - like there's air in the system. Someone suggested a defective piston seal could allow air to work itself inside a brake caliper. They said this was a problem on old Corvettes. Bleeding the left rear caliper on this Volvo does restore a firm pedal for several weeks.

Happy Motoring, Mark

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