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How to test the Brake Booster 850

posted by  B.B. on  Tue Sep 7 13:57 CST 2010
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

I'm stuck with intermittant crappy brakes. It's not air in the brake lines.
It's a problem with vacuum. My local Volvo maven suggested checking the brake booster for a vacuum leak.

He gave me a gizmo to plug into the checkvalve port and draw a vacuum on it
and see if it holds up. I can do that with my harbor freight vacuum brake bleeder that has a gauge for vacuum. Comments?

This is wonderful to use that thing since I think it's better to pressurize
the master cylinder and bleed the brakes that way.

Comments appreciated,

Bill






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