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  #1  
Old 01-29-2010, 09:23 AM
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Tire/Brake issue

On my 126 I have been looking for this vibration issue. finally tracked it down to a bad tire. Changed it to another one. And it pulled hard. So I swapped on another and everything seemed fine. (these were all on differant rims)
On the way home from work 2 days ago, someone pulled out from a side street in front of me, and I had to lock it up to keep from hitting them. I was going about 50mph.
After that I had a small vibration again. So I looked at the tires, and the right rear tire was worn funny. So I changed it. The only one I had was the one that was making the car pull really hard on the front.
Now the strange thing. After that change, I am having a brake issue. After being on the road about 20 min, I loose braking to a large extent, Got home last night, and this rear wheel was hot.
So it seems that this wheel is causing the hub to heat up, and cause a fliud issue? will changing the wheel fix the issue? is there any way to check for permanent dammage?
How do I tell if it is the wheel, ot the tire?
Sorry for the long post.
Thanks

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Old 01-29-2010, 09:27 AM
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check the caliper
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Old 01-29-2010, 09:28 AM
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That sounds like one of the pistons in the rear calipers got stuck.

You should remove the wheel and caliper on the affected wheel and verify operation of both pistons on the caliper. They should move in very easy in by squeezing them. Using a C clamp you can secure one side and check the movement of the other by lightly depressing the brake pedal. Then vice-versa for the other side.
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Old 01-29-2010, 09:30 AM
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Lift the car and turn the wheel, it should turn freely. If not, your brake is dragging.
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Old 01-29-2010, 09:31 AM
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The issue with the tires is totally and completely unrelated to the issue with the brakes. No possible relationship exists between the two conditions, so your story needs some revision to allow a proper diagnosis.
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Old 01-29-2010, 09:37 AM
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when you slammed on the brakes, your rear caliper locked up. Possibly going in reverse and slamming on the brakes MIGHT free it up (in an emergency situation) but it should be replaced/repaired.
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Old 01-29-2010, 09:43 AM
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Answer

The vibration may be a shifted belt or bent rim.

The brake fade and heat could be several issues, here are a few:
* Bad hoses.
* Bad calipers.
* Dangerously bad wheel bearing.

Please read the following thread..

Brake:
Brake:


Brakes caught fire 1999 C280 (with pictures of damage)
Brakes caught fire 1999 C280

Tell my dad my tire is on fire!
Tell my dad my tire is on fire! :eek:




Have a great day.
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Old 01-29-2010, 09:51 AM
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I was leaning toward the caliper also, but on the way home, 20 min. Right after the almost accident, I did not have any issues with the breakes. But to think of it, I do use the brakes a lot less on the way home than on the way in, so maybe I did not notice it.
I was trying to put together how a wheel that made the car pull on the front, could cause the rear to heat up like that when placed on the rear.
So it sounds most like a caliper issue, and nothing to do with the wheel? Just lined up that I changed all of this arround at the same time.
And the front tire was swapped the evening before the hard breaking, and the rear the evening after it happened.
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Old 01-29-2010, 10:06 AM
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after reading through those posts, it is only one side, so that rules out the MC. so possibly the caliper or hoses.
Could the heavy breaking have broken the hose internally? and after sitting for a while, it bleeds off? I know it sounds like it all has to be changed. Just thinking about why.
thanks
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Old 01-29-2010, 12:01 PM
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Yes

Quote:
Originally Posted by blackestate View Post
after reading through those posts, it is only one side, so that rules out the MC. so possibly the caliper or hoses.
Could the heavy braking have broken the hose internally? and after sitting for a while, it bleeds off? I know it sounds like it all has to be changed. Just thinking about why.
thanks
Yes, the heavy braking could have broken the hose internally.
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Old 01-29-2010, 12:04 PM
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Quote:
Originally Posted by blackestate View Post
I know it sounds like it all has to be changed. Just thinking about why.
thanks
Tennyson said it best,

"Their's not to make reply,
Their's not to reason why,
Their's but to do or die:"

Most likely, caliper is sticking (or hose is collapsing), heating up everything, boiling off the brake fluid at the wheel. Pull the wheel check both sides of the rotor for blueing from heat, try to spin to see if it's sticking, check for bad bearing. If caliper or hose, rotor may be warped from heat. You won't know anything until the wheel comes off...
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Old 01-29-2010, 12:37 PM
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can not take the wheel off till Monday, so just sitting at work thinking about it.

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