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Shappy 03-05-2020 08:53 PM

Brake problem '99 V70 n/a
Looking for a brake booster check valve and possibly a whole booster. Most of the time the brakes work just fine, but a couple of times each trip when I apply the brakes the pedal is very high and very hard, with no apparent braking effect. I then must pump and/or press harder to get the brakes to resume normal operation. I'm guessing the problem must be one of 3 possible components - the check valve, the position sensor, or the booster itself. I don't want to replace all 3 and discover the problem is something else. I'd like to understand why it is happening before throwing time and parts at it. Car has ~100k miles on it and is all original. Suggestions please? I'd like to find a check valve in order to test whether that is the component I need. Here's what I'm looking at ...

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