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When i drive my 1996 astro awd van i hear a sound like a warped rotor checked rotors are new checked u-joints rear drums inner fender wells what is this
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Almost everything including what I am going to suggest should change noise by speed. The rear emergency brake liners come off the metal and get ground to dust. Centrifugal force will pin the dust to the inside of the inner rotor/drum. Then when speed drops it falls and makes noise again.
Sometimes exhaust shielding can flap and make a scrapping sound. Check your catalytic covers and various heat shields and exhaust joints. Also some drive-trains had balance weights on the exhaust system. Many muffler shops remove them when changing exhaust parts.
If when applying the brakes the steering wheel shakes then your front rotors are warped and at the least need resurfaced and most likely the brake pads replaced. But more likely the rotors are too thin which has allowed them to overheat and warp which causes the shaking. In this case new rotors and pads are in order. If when braking tou feel the shaking in the seat of your pants then most likely the rear brakes are the issue. Same problem as the front, warpage, but your rear brakes are most likely drums. Again, possible resurfacing and new shoes; but more likely new drums and brake shoes.
But I wonder? Did this vibrating just start all of a sudden or maybe after a near accident requiring you to brake very heavily and possibly overheat the brakes. Or my main concern, to keep this from happening again, after pulling some type of trailer that you intend on pulling again. Pulling a trailer without its own brakes puts a much heavier load on your trucks brakes and just repairing them won't keep it from happening again if you ARE pulling a trailer. Higher quality rotors/pads/drums/ and brake shoes can help but if the trailer is too heavy for the truck nothing but installing brakes on the trailer or a lighter trailer will stop you from warping them again.
Lastly, in general when you let off the gas and the whole vehicle shakes the driveshaft/u-joints are common causes. Same with the steering wheel if it shakes when letting off the gas, but only on a 4x4 or AWD vehicle. So check your driveshafts and u-joints and make sure they are tight. But unless you find something obvious there I would wait until you have the brakes sorted out and see if that doesn't stop all the shaking.
tsb remove dist cap ,clean out breather holes i replaced cap and rotor at the same time. chevy has the problem with the 4.3l astro,s and blazer i have both.fixed the problem when buying the cap and rotor the directions inside will also tell you how to fix
Assuming...you get the noise with the vehicle moving; try loading up one side at a time by doing lane changes when you hear the grind. If the noise increases & then decreases as you go from side to side then you probably have a bad wheel bearing. Also, You could just have a pebble caught between the backing plate & rotor! (they have a tendency to fall out quickly)
well first of all just because they can be turned dosent always mean that you should do it, now a days rotors are alot cheaper to just replace them, however whatch where you buy them. in most cases you get what you paid for, Like cheap rotor prices=less life, same for the pads and how hard the driver uses the pedal. and as for the "classic rotor warp" thats not always the case with these newer cars having more movable joints than ever befor, it could be, bad hub bearing,bad lower ball joint...etc....good luck
Assuming you are not referring to the pulsation experienced when the anti-lock braking system engages, you should replace the rotors and the pads while you are at it. The days of turning or resurfacing rotors are over. They are cheap.
Check for runout in your wheel bearing hubs. You can also hit your e brake lightly and see if it shakes then. If it does, it is in the rear rotors which will also warp.
The rear shoes and drum are not in even contact when braking, thus resulting into entire vehicle vibration. The most likely cause of misalignment is a warped rear drums. However, it is possible that the drums are ok, but rather the rear wheel bearings are worn or loose, this would likely cause misalignment between shoes and drums
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