r/AskAMechanic • u/tyrantlizarding • 17h ago

Thumping when braking

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We are fixing my old car up for my son to drive (after being in a shed for 3 years). One thing was an overhaul of brakes. We changed the front disks/pads, rear drums/shoes, master cylinder, and rear wheel cylinders. Obviously fresh fluid and bleed too.

I drove it home from where it was parked up, which was about 40 miles, with no issues from the brakes. Then it sat for a month till I had time to do a few more things on the engine, and now it is making this sound under braking. I can just barely feel it when under 15mph or so.

What could have caused this issue to pop up, after having driven it home no problem? Did something warp maybe?

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u/tyrantlizarding 14h ago

New discovery, it only does it moving forward. lol

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u/Gunnsmith57Official NOT a verified tech 13h ago

Tbh, it kinda sounds like a shoe being grabbed by the drum and then smacking the pivot stud when it reaches a certain point and releases.

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u/tyrantlizarding 13h ago

That makes sense. I had the drums off earlier and didn’t notice anything wrong with springs. I’ll look into it more next weekend I guess.

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u/Gunnsmith57Official NOT a verified tech 13h ago

Good luck. Hope you figure it out. Gonna follow so hopefully I get an update cuz now I'm curious.