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Chris183 · 03-29-2018, 11:55 AM

I thought I should give everyone an update. So I went through the brake system again, bleeding and adjusting everything with little improvement. So to see what would happen I brought the blazer up 30mph shifted into neutral and stepped on the brakes. Well all four wheels locked right and stopped on a dime. So I guess I'm looking at a vacuum problem. The booster passed the pedal test, then I checked vacuum. It turns out that I have 15" (A little low but not bad) in park at 1000 RPM and only 9" ( Way to Low) in drive at 750 RPM
and when I put a vacuum gauge on the booster the Vacuum goes from 15" to 0" in 15 seconds. I assuming the booster is bad and I have some other vacuum issues.

Chris

03-29-2018, 11:55 AM	#14
Chris183 Registered User Join Date: Feb 2012 Location: Lindenhurst, NY Posts: 7	Re: 72 4x4 poor front braking I thought I should give everyone an update. So I went through the brake system again, bleeding and adjusting everything with little improvement. So to see what would happen I brought the blazer up 30mph shifted into neutral and stepped on the brakes. Well all four wheels locked right and stopped on a dime. So I guess I'm looking at a vacuum problem. The booster passed the pedal test, then I checked vacuum. It turns out that I have 15" (A little low but not bad) in park at 1000 RPM and only 9" ( Way to Low) in drive at 750 RPM and when I put a vacuum gauge on the booster the Vacuum goes from 15" to 0" in 15 seconds. I assuming the booster is bad and I have some other vacuum issues. Chris