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 .
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/
Recommended Posts
Archived
This topic is now archived and is closed to further replies.