applying the brakes just a little it will almost throw you through the windshield?

1998 CHEVROLET SILVERADO

310,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC

SMNORMAN

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When this truck sits for 2 days or more and it has rained after starting to drive and then applying the brakes just a little it will almost throw you through the windshield. It doesn’t feel like or sound like the brakes are locking up.
Also when it sits and has not rained there still a very little same issue.
Had all new brakes (at wheels) installed. Checked for air in the system with no notice.
Had Chevrolet dealership check it out and still they said there is nothing wrong.
I’m almost sure it has a valve in the rear for the load system. It also has been checked.
The truck listed above is a K2500. I’ve had it since it had 11,000 miles and it has always been there.
Any ideas?

Thanks,

Steve

Feb 10, 2021 at 1:42 AM

KASEKENNY

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Does this get better after it does it? Meaning you let the vehicle sit and then you drive it and it is going to do it, does it eventually stop doing it after you brake a few times? Then it is fine until the next time it sits?

If this is the case, then I suspect your rotors in the front or rear (or drums if you have rear drum brakes) are rusting and they are grabbing when you brake at a higher speed. The way to stop this is either change the brakes or knock the rust off when a specific driving style.

If you replace them, and then let it sit again, then there is no guarantee that it will not start again.

What I would suggest is driving it a specific way after it sits. So when you first start driving it and leaving your neighborhood, just take it up to 5 mph and then stop pretty quick. Then do 10 MPH, and stop. Then 15 MPH and stop. By this point you should have some heat in the pads and any surface rust on the rotors has been knocked off.

https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd

Here is the info from the manual on how to replace the brakes if you need that as well.

Let us know if you have questions. Thanks

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Mar 12, 2021 at 9:55 AM