Why does my 1985 Volv DL make a hissing sound when I apply the brakes

Brian Robke

Asked by Mar 26, 2016 at 09:07 PM about the 1985 Volvo 240 DL

Question type: Maintenance & Repair

When braking my 1985 Volvo DL I can hear a hissing sound that sounds like air being released. Please advise?

1 Answer


There is a vacuum leak somewhere, it could be right in the brake assist booster, indicating that it is going bad. Should have a garage check it out as if it fails, braking would be extremely difficult.

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