u/PossesiveGamer

So last night as I was going to the store in my 2001 Sierra my booster failed on me. Had to slam on my brakes, with a whooshing noise and rough idle while the pedal is applied. I work in a shop so I had the new Booster ordered and I replaced it today. Well my truck, when we got it as a gift, had the notorious ABS and Parking Lights on. I figured it was the module and had plans to replace it with everything else, as I'm doing basically a full restore on it. Well I noticed, after work and doing Doordash for a bit, after like 5 startups my lights disappeared and they never came back on. I no longer feel fluttering in my pedal either.

My question is can a new brake booster actually resolve my ABS and Parking light? Or could there be something else that caused it?

Hello all this is my first post in this community but I figured yall would know best here. I'm a learning mechanic and have been working in an actual shop for almost a year now. My wife and I were gifted a 2001 GMC Sierra 1500 2WD from her parents after our 3rd kid. It currently has 285,710 miles on it. Saturday 6-13-26 I replaced the transmission because it had the notorious issue we are all aware about. I have already replaced a few other things listed below but I was just wondering what are the other major things I need to worry about or replace before it causes catastrophic damage?

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Things Replaced Currently:

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Transmission

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Oil Galley Plug

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Rear Main Seal Cover

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02 sensors

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Fuel Pump

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Fuel Filter

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Fuel Injector Pressure Regulator and Vacuum Line

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Spark Plugs

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Spark Plug Wires

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Air Filter

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Planned in the future:

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Oil Pan Gasket

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Engine Mounts

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Serpentine and AC Belt

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Both Tensioners

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Idler Pulley

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I do still have other issues as well besides engine like my ABS/Parking Lot keeps coming on but looking online I might check the ground strap underneath the battery tray? Could that be it? Also my airbag light is on and I believe it says for the Passenger Presence Sensor. Im not sure how to go about that one if someone can help me understand some more of all of this that would be great.

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Like I said I do work in basically a dealership alternative shop so most of this stuff I can always get someone trained to help/guide me on the installs, like I did the transmission. I just want to know what to look for before it gets too late and I dont want to bother manager and the mechanics too much about it all.

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Thank you for your time and reading this and if you can help me out that would greatly appreciated.

​

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Also mods if this is not the place to ask or if Im in the wrong place just let me know and I can take down the post or move it. Thank you.

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*Also posted in the GMC Sierra forums for more help*

Hello all this is my first post in this community but I figured yall would know best here. I'm a learning mechanic and have been working in an actual shop for almost a year now. My wife and I were gifted a 2001 GMC Sierra 1500 2WD from her parents after our 3rd kid. It currently has 285,710 miles on it. Saturday 6-13-26 I replaced the transmission because it had the notorious issue we are all aware about. I have already replaced a few other things listed below but I was just wondering what are the other major things I need to worry about or replace before it causes catastrophic damage?

​

Things Replaced Currently:

Transmission

Oil Galley Plug

Rear Main Seal Cover

02 sensors

Fuel Pump

Fuel Filter

Fuel Injector Pressure Regulator and Vacuum Line

Spark Plugs

Spark Plug Wires

Air Filter

​

Planned in the future:

Oil Pan Gasket

Engine Mounts

Serpentine and AC Belt

Both Tensioners

Idler Pulley

​

I do still have other issues as well besides engine like my ABS/Parking Lot keeps coming on but looking online I might check the ground strap underneath the battery tray? Could that be it? Also my airbag light is on and I believe it says for the Passenger Presence Sensor. Im not sure how to go about that one if someone can help me understand some more of all of this that would be great.

​

Like I said I do work in basically a dealership alternative shop so most of this stuff I can always get someone trained to help/guide me on the installs, like I did the transmission. I just want to know what to look for before it gets too late and I dont want to bother manager and the mechanics too much about it all.

​

Thank you for your time and reading this and if you can help me out that would greatly appreciated.

​

Also mods if this is not the place to ask or if Im in the wrong place just let me know and I can take down the post or move it. Thank you.

​