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brakes lock up loud grinding clunking


jacobdecker

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hello, long time reader, spend at least a hour a day on here reading and learning, my trucks my hobby.

i always try to find the answer here and i usually do except this time so im finally gonna make my first post and anything will be appreciated, lot of good knowledge on this site.

 

 

I have a 2004 silverado 2wd. only mods is spindle lift and 33s, Yesterday i had 3 people in the truck and another 1200 pounds at least of dirt bikes and guns. i was getting off a freeway off ramp and had to slam on the brakes

because there was a stop sign i didn't see. the brakes grinded until we came to a stop. when i started off again my left front break was still stuck all the way down and wouldn't come undone. so i hit the gas and there was a clunk and i was able to drive normal, but when i went to hit the brakes extremely loud grinding and clunking till i came to a stop and locked up again.and its doing this every time. so i pulled off the brake caliper , put it do the side to move my truck down the street and noticed the right side is grinding and locking up too. now i read about calipers sticking, ,master cylinder, brake bleeding, but what throws me off is when i go in reverse and hit the brakes it sound like there is nothing wrong, anyone have and ideas what could be going on? thank you very much.

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This almost sounds like a caliper mount has come undone. For example one of the two caliper mounting bracket bolts is missing or broken allowing the mount to rotate, making the caliper hit the wheel. Backing up will rotate the caliper back to its more normal position.

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This almost sounds like a caliper mount has come undone. For example one of the two caliper mounting bracket bolts is missing or broken allowing the mount to rotate, making the caliper hit the wheel. Backing up will rotate the caliper back to its more normal position.

You were exactly right, the bolt had fallen off, I replaced it but the caliper piston was damaged so I replaced the caliper and problem fixed thank you very much

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I would look into the master cylinder. Mine would still go in reverse (although you could tell there was still an issue). What happens if you let it sit? Does the grinding/rubbing/clunking ever go away? In reverse, your brakes act differently. That's why you have smaller brakes in the rear, less demand.

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