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: Brake Swooshing Brakes Bleeding off scooterthejake 07-24-2010, 11:46 AM Hello, I have a 98 Chevy 6.5L reg cab 4x4 auto tranny. Recently I noticed that if I have the truck in park, and you push down on the brake pedal, you can hear it making a "swooshing" sound. And the brake pedal seems to bleed off. Any ideas? Thanks in advance. Dungeon Customs 08-01-2010, 01:29 PM My 04 2500HD does the same thing! Any ideas? gearhead 08-01-2010, 05:57 PM master cylinder .? kgt 08-01-2010, 11:12 PM not abnormal for those years, i think its the pypass valve in the ps pump opening. heard that noise on many that i have worked on in the dealer. not a issue as long as it feels normal when driving and braking | ||