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post #1 of 5 (permalink) Old 03-18-2016, 07:25 PM Thread Starter
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Lightbulb Brakes squeak and thud?

I'm not a car guy and am concerned with my brakes. I don't have any money to see my mechanic currently, so I'm stuck with the internet to help me. Basically, as the title suggests, my brakes are a bit funky. Like they thud and squeak. Example will be when I'm slowing down, from anything over 30mph, it thuds. Like thumps. If you watched Bambi, remember Thumper thumping his foot down and telling Bambi his name? Pretty much sounds like that. Not smooth.

Now it also makes a squeak sound when releasing pressure. Just like a rusty door that's in need of oil.

It's really bad when I'm on the highway and need to slow down. Thud-thud-thud. VERY hard. I get there's a brake issue, since my granmas car did the same thing, but I'm just curious as to suggestions.

And I know this is unrelated to brakes, but when I accelerate it vibrates. It's really bad when my friends in the car with me. With him, it heavily vibrates when I try going over 30. Alone, it vibrates when I start going over 45. I just learned it usually stops or doesn't as hard if I slowly speed up but curious as to any reasons for that.

I will be seeing my uncle about these issues sooner or later, when MN decides to stop playing with this snow (as I type this it's snowing!!!) and I can safely drive to where he's at. So if I need to see a mechanic, will do soon. But any suggestions are welcome. Thanks!
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post #2 of 5 (permalink) Old 03-18-2016, 08:54 PM
That rhythm is INFECTIOUS.

 
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Lots of things can cause the symptoms you are experiencing:

Vibration during accelleration - worn suspension parts (inner tie rod ends, ball joints/LCA bushings, etc...

The 'thud' sensation - do you feel it at the brake pedal at all? Is it more pronounced the harder your brake? Better or worse when brakes are cold or hot? I had a similar issue on my newer 300C - turns out the front rotors had a slick/sticky spot on them. They probably were never broken in properly. Rotors replaced, stops smooth as silk.

One thing you can try is to 'bed the brakes'.

Could have a balance issue on the wheels - you can try swapping the front to the rear and see if the issue changes at all.
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post #3 of 5 (permalink) Old 03-19-2016, 01:14 PM
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a wheel bearing, loose wheel, might create your sound and experience at all speeds.
other loose suspension parts can also create your troubles.
get some stands, get the front end in the air, and start looking through for loose parts.
if it's a wheel bearing this bad, you'd be lucky to make it to your uncles.
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post #4 of 5 (permalink) Old 03-20-2016, 10:57 AM
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I have an old minivan with a similar issue. Mostly it's from lack of driving and the rust on the rotor surfaces that builds up unevenly. I'm not saying that this is your symptom exactly and, I do suggest you have this looked at, (As stated in previous posts).

I have had a new pair of rotors and a new set of brake pads on the passenger floor for two years now. Guess someday, I'll get around to it.
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post #5 of 5 (permalink) Old 03-20-2016, 10:07 PM
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Quote:
Originally Posted by Adpros View Post
I have an old minivan with a similar issue. Mostly it's from lack of driving and the rust on the rotor surfaces that builds up unevenly...
Good point. If a vehicle sits for a few weeks or more, especially in damp weather, there will be enough difference in the rotor surface (where the pads hold moisture against the rotors) that it will feel like a major problem, and will thump really hard upon breaking. If that's the problem, only fix is turning rotors, or replacing rotors (recommended, as pitting may be too deep clear without going under min. allowed rotor thickness). I experienced this exact phenomenon last year when the car sat several weeks during delayed engine swap. Stopped smooth as glass once rotors replaced.

If you see a footprint of the pad where there is a corrosion difference on rotor swept surface, I'd say that definitely is the problem.


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