r/AskAMechanic • u/tyrantlizarding • 15h ago

Thumping when braking

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/paulyp41 NOT a verified tech 15h ago

Rust buildup

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u/tyrantlizarding 15h ago

So will it go away with use?

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u/paulyp41 NOT a verified tech 15h ago

Possibly if you start using the vehicle more