Strange issue with brakes

CAPTAINMAGIC

MEMBER
2003 CHEVROLET S-10
4.3L
6 CYL
4WD
AUTOMATIC
155,000 MILES

When I bought my truck the ABS and brake light stayed on anytime the vehicle was running, after sitting for over a year and being repaired to some extent (new battery, fresh fuel, fuel pump, front wheel speed sensor, camshaft position sensor, distributor cap, plugs and wires, exhaust with catalytic converter delete.} Now the ABS and brake light will turn off sometimes when I push the brakes and will stay off for the duration (even after turning truck off and back on after several minutes). When the lights turn off the brakes have a strange popping sensation/grinding noise only at the final bit of a complete stop, not when slowing or even when starting from a complete stop or new start, only when I actually get to a complete stop and start to release the pedal to stop slowly does this happen. It doesn't seem to happen if I continuously press the brakes with steady pressure with no slight release as I come to a standstill. Please help me understand what the issue is and how to fix it.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

This sounds like the master cylinder is the issue. There clearly could be more issues but the brake pedal feel and noise sound like a master issue.

Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Before you replace it, we need to check and make sure you have no external leaks. If you don't then I would replace the master and then recheck the operation of the rest of the system.

I attached the process below from the manual.

Let me know what questions you have. Thanks

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