Brake pulse only when warmed up. None when cold

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  #1  
Old 07-16-10, 11:55 PM
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Brake pulse only when warmed up. None when cold

My 06 Charger has brake pulsaton only when warmed up after about 10 or 15 miles. Yesterday when it rained very hard, it had no brake pulsation.
I know these cars are bad for the tension struts (radius rod type thing)
I do not think it has to do with the brakes because when cold its smooth as silk.
What else could do it?
Wheel bearing; bushings? Over active imagination? Or is it possible that hard spots on the rotors only cause problems when hot? I doubt it.

Any ideas?
 
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Old 07-17-10, 03:33 AM
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Originally Posted by frankiee View Post
Or is it possible that hard spots on the rotors only cause problems when hot? I doubt it.

Yup.......a "Pulse" will ALWAYS be worse when hot, And sorry to say, These cars are worse on brakes than tension struts..Although it is a close battle.

A resurface should bring you back to normal, for a little while anyway...
 
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Old 07-17-10, 06:19 AM
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thanks
I replaced one rotor yesterday and it helped a bit so today I will resurface the other side. I suspect it is the fronts only that have the problems
Hard to figure out why.
They are not small rotors at $85 each and I am not 16 anymore.
As far as I have read, warped rotors are just a build up of pad material transfer.
Have you had any luck with different pads?
I am reluctant to get expensive pads because I have heard that they all do this
Thanks again
 
  #4  
Old 07-17-10, 08:20 AM
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Pulse only When Warm or Hot

Things to feel when your doing your diag.

Getting a Slight or Hard wobble in the Steering wheel While Any Braking. Always Front rotors. It will pulse the whole vehicle, steering wheel and brake pedal, higher speeds amplify it.

Getting a pulse in Pedal, and can get pretty bad to Almost a Noise in the cabin, no steering wheel wobble but it may pull Slight left or right on the first touch of brakes. Then stop and feel normal.

Sometimes you would think your all your brakes are warm, but with rear brakes, Your Front rotors are warmed up, and you feel your Cold warped Rotors or drums in the rear. They need some miles to really warm up or a few hard stops. On a HARD stop, Rear brakes only stop about 30 percent of the vehicle. Rear brakes use Alot less fluid per wheel and the transfer of pulsing rotors, drums is minimal but enough to annoy you.
Rear Rotors, Drums, or Rotors with Drum Parking Brakes.
Some can be tested with your Parking brake while your rolling slow, ease on the parking brake and check for pulse.
Rotors with Drum parking brakes inside the Rotor, this test is useless!

Rear Brakes Love to Seize up because they are used so little, and out last Front 2 to 3 times.
 
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Old 07-17-10, 06:51 PM
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get a set of slotted rotors. be happy. been there.
 
  #6  
Old 07-17-10, 08:04 PM
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Originally Posted by frankiee View Post
thanks
I replaced one rotor yesterday and it helped a bit so today I will resurface the other side. I suspect it is the fronts only that have the problems
Hard to figure out why.
They are not small rotors at $85 each and I am not 16 anymore.
As far as I have read, warped rotors are just a build up of pad material transfer.
Have you had any luck with different pads?
I am reluctant to get expensive pads because I have heard that they all do this
Thanks again
suggest-replace 'both' rotors- hard/hot spots are so hard -they cannot be cut out.
try a set of '100% ' ceramic pads- you will not be dissapointed
(they are $$-but worth it)
 
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