Scratching my head with this one good people... 2007 Avalanche, 5.3, fresh engine rebuild, Chopocabra Cam. Having braking issues. Not sure if its something in my tune, or if I'm battling a mechanical issue. So far, Ive changed the brake booster with a known good one, changed the check valve, new AC Delco MAP sensor. Vacuum is a bit lower than Id like to see, but I don't think its so far out of spec to cause the pedal to be this hard. Looking to see if perhaps I need to run an aftermarket vacuum pump, or am I missing something. Posting the most recent log with all the mechanical parts replaced. Any insight would be great!
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