Vibration when braking

[gslrider]

I have a 98 Camry 4cyl. Before I swapped out my winter tires for my summer tires, it ran fine with no issues. I replaced my tires a couple of weeks ago (myself as I always do), but didn't drive the car (except for driving up and down the my street to test, and that was fine). My car sat in the garage for about 2 weeks. When I went to take it out the other day, I felt it shift hard from park to drive (like a thud sound). I've heard this before especially when I have the parking brake on and I'm parked on an incline. So didn't think much of it. But as I started driving out of my garage, I felt mild pulses when I applied the brake. And the faster I went the more intense the vibration was when I applied the brake. What could be the reason? I've read some other posts that it could be a warped rotor. But can a rotor suddenly get warped with the car just sitting in the garage? Or could it be something else. Taking the "thud" sound as a queue. Thanks for the input.

[Mister_Perkins]

could be the rear drums (if ya got rear drums) Those are notorious for rusting.

Rust also could cause a vibration when stopping on the front rotors from sitting

[gslrider]

Thanks Mr. Perkins. I do have rear drums. Which I might add, was recommended by mechanic to replace soon, as it was wearing thin. I didn't think about that, considering he said I had nothing to worry about, since I don't drive much, hardly on the highway, and still had some padding left. But the rust thing may play a factor in expediting the life of the drum. It does seem more rusted now then it did before winter. Front rotors are fine, no rusts. Plenty of pads on the breaks, and my calipers are new. I will check the drums and report back. If it is the drums, caused by rust, but still has pads, is it advisable NOT to drive it? I would need to take it to my mechanic to get it worked on. Or is there a way for me to clean it (rust) up to get it back to working order?

Cheers.

[Mister_Perkins]

the most common thing to happen on the rear drums is Heat will warp the rear drums, causing a vibration while stopping. If you have your E-Brake set for a few days it can cause the shoes to stick when released (The bang type feeling when you moved).

Most likely your drums are out-of-round ; or not completely Circle anymore.

Its ok to drive the car on bad brakes. The only thing you want to be weary of is over-extending the rear brake cylinders if the shoes are too thin. If the shoes are dangerously thin, it can cause the brake cylinder to push out farther than its supposed to, and you will loose your brake fluid and loose control of your brakes (needing to use the emergency brake to stop).

If your mechanic recommended replacing the rear drums ; I would suggest replacing the rear drums / shoes / spring kit all together as soon as possible.

The surface rust on the outside of the drum will not cause braking problems, its rust on the inside where the shoes and drums contact.