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Brake issue....


chadz34

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When I am driving over 60 km/h....and I apply the brakes they pulsate really bad kinda like a ''thud thud'' when I am going fast enough, I know it isn't pads or rotors becuase I changed them both TWICE thinking they were warped....I am lost...what could my problem be? :confused:

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What condition are your tires in? Are they properly balanced? Out of round? Any damage to the wheels at all?

 

Did you make sure to clean the rust off the surface of the hub(s) before installing your new rotors?

 

Did you torque the caliper mounting brackets to the proper spec (and coat the threads with anti-sieze) ?

 

Are your lugnuts tight?

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i had the same problem with the rear of my cutlass and it turn out it was the right rear hub, it was slightly warped and seems to get worse when it was hot outside. It wasn't warped enough to notice any shimmy in the rear end, and no vibrations at all either. If you take the tire off and spin the hub does it seems to be warped at all? I changed my rotor 3 times before I figured it out.

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Lugnuts---100 ft/lbs.

 

Are you sure about that? I'm pretty sure that my Haynes manual states that it is 60 ft/lbs IIRC.

 

Yeah, that's the right torque. That's what we torque them to at work.

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Is the thud thud felt in the brake pedal? Is it felt in the steering wheel? If its in the wheel also then focus on the front end. Not much that can cause it on a w-body... assuming everything is tight. Has to be rotors or wheel bearings, also check the front caliper brackets for wear grooves that are preventing the pads from sliding back and forth. W-Body front wheel bearings can be horribly bad and not give any indication in ride quality, my are horrible right now, but you can't feel it while driving. Jack up each wheel one by one and see if you get any movement top to bottom or side to side. I am still leaning towards rotors though...

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I can feel it in the wheel and the pedal, it's only when I apply the brakes though so wouldn't that eliminate the wheel bearing?? It is a nice ride when coasting and accelerating but soon as I touch the brakes it is bad. The tires are still the original, but again....only when braking?

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is there a chance that you have a broken calliper bolt? or even a loose one may cause that? however if you've changed the brakes twice i'd think you'd have notied it then.

 

can you feel it on one side more then the other?

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It feels like it's the right side. I am really stumped. I want to do this myself rather than pay. I just don't have the money right now. The caliper bottom bolts looked broken on one side, I checked the other and it looked the same. So, I don't think there's anything wrong there. Weird thing is, it's only when I apply the brakes I get thumping and shit from the right side. Once I let off....it's smooth. And maybe related to the same problem, but when i am at about 140 km/h (80 mph) the car shakes a bit. I don't know if it should or not.

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if its namely coming from one side, heres what i'd do:

 

swap the front tires with the back see if it stays the same, if it does then thats ruled out

 

how bad were your old rotors, was the right side any more tore up then the left?

 

if so, i'd consider replacing the calliper on that side

 

and the general questions, do your balljoints have any play, any play in the rod ends?

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Maybe one of your calipers is sticking and causing the rotor to warp. I know my driver rear caliper sticks sometimes, and I always have pulsation. I just ignore it. :lol:

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Maybe one of your calipers is sticking and causing the rotor to warp. I know my driver rear caliper sticks sometimes, and I always have pulsation. I just ignore it. :lol:

I don't know if it's sticking it may be, but I hope I don't need a caliper. I will get it checked out and fix it myself.

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I know mine sticks like a bitch if I ever use my parking brake.

I use mine sometimes, could it be stuck? And if it were wouldn't the ''IP'' light be on?

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I know mine sticks like a bitch if I ever use my parking brake.

I use mine sometimes, could it be stuck? And if it were wouldn't the ''IP'' light be on?

 

My "Brake" light is never on, and I know when it's sticking because the rotor stinks, and it sizzles when I spit on it.

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I know mine sticks like a bitch if I ever use my parking brake.

I use mine sometimes, could it be stuck? And if it were wouldn't the ''IP'' light be on?

 

My "Brake" light is never on, and I know when it's sticking because the rotor stinks, and it sizzles when I spit on it.

How did you unstick it?

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