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I think you are right the brake booster must be leaking internally. I have tried everything else. Yesterday I replaced the check valve thinking it maybe wasn't closing all the way. Didn't really believe it since the booster held vacuum when the truck was off. I even bought an original gm check valve from Rockauto. That booster isn't even a year old. O'Reilly's lifetime warranty. I am not looking forward to removing/installing that brake pedal clip again. Good news is that my truck is running great after the throttle body re-built issues. Thanks for the support. -
By Another JR · Posted
Newdude posted while I was typing. If they didn’t have very good torque control with their impact driver or if they did the final quarter turn after applying 89 ft lbs, I agree with him they should be replaced. -
Yes i would like to buy a Silverado Silverado please. Then I'm gonna go get the papers, get the papers..... Did GM hire Jimmy Two Times or something to help rename their line???? -
By Another JR · Posted
Based on the service manual picture you posted, the four vertical bolts are single use and the torque specifications appear to be intended to be “torque to yield,” which permanently elongates the bolt. If they were torqued per that specification they should not be reused. However, if they used a properly limited impact device and only torqued them to the initial torque value of 89 ft lbs and did not do the final 70 to 80 degrees of additional rotation, they never yielded the bolts and they could be “reused” and torqued properly. The biggest issue in deciding whether to reuse them likely will be uncertainty over the torque applied by the impact driver. -
No. If they were rammed in with an impact, they are stretched and need to be replaced. Hence one time use torque to yield fasteners.
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