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brake booster? 700 1989

Recently drove my wifes 89 740 T wagon and noticed that the brake pedal when depressed makes a hissing sound. Am I right in thinking that the brake booster is leaking? Any recomendations? Can these boosters be rebuilt? Is there a rebuild kit? Is the only option a remanufactured unit?
Thanks in advance
UB








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brake booster? 700 1989

i think mine does that as well a tiny bit and it always has i believe. it does it when i'm depressing it.

do you mean yours does it when you're holding it steady? because that would be strange.
--
Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'







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