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maybe just plug the vacuum line to the booster, to rule out that path as being the cause of the rpm change? -
94 Silverado 350 When I apply the brakes, the rpms drop. In park or neutral the drop is approx 150 rpms and in reverse or drive approx 250 rpms. When I release the brake, the rpms go back up to normal. I installed a new booster (rebuilt) last august 2025. Didn't have any problems until a couple of weeks ago. When I was working on the throttle body issues last month, I noticed some leaking around the booster vacuum line, so I replaced it. I have gone back and re-tightened the hose clamps and don't hear or see and leaks. I don't think the booster itself is leaking internally. The brake feels like normal and it stops ok. The pedal doesn't go to the floor, and I don't hear any hissing. When the truck is off, I still have pressure, so I guess the check valve is, ok? I do question the rubber check valve grommet. Maybe its leaking around it? The replacement hose was just a section of new hose. I plan to check it some more and test the check valve. When I rebuilt the throttle body, I did replace the idle air control valve with another one I had. It was almost new, so I don't think that is a problem. Any other ideas or test suggestions. Thanks -
I was a little surprised this morning when a third local dealer, one I've never really done any business with, showed some interest and follow through to the point that I've ordered my build for a new 2026, std cab/std bed . -
By asilverblazer · Posted
I take it as add one quart at a time until the level is within the hatched area. I'll be attempting to better determine on my current two trucks what 1 quart looks like on their dipsticks. -
Try this: https://magnoliaadvanceddesigns.com/collections/rear-window-bezels On another forum some members are getting these: https://rtgoffroad.com/product/rear-back-window-black-and-shiny-sticker-patch-for-chevrolet-silverado-2019-2025/
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