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Re: In 2004 Impala, do I have rotor or drums?
The best way to answer you question is to tell you to take the vehicle to your nearest dealer and inquire with the parts dept. I can tell you that on the ffront of your car you have rotors and the brake used on the front is called a pad. Also your vehicle does not have a separate parking brake. It is the same as the regular rear brake no matter which type of brakes you have on the back.
You have rotors usually only the front rotrs and pads need replacing, if you haven't let the brakes go to the point of rotor warpage you can get away with just replacing the front pads. If a pulsation is detected when applying the brakes at higher speeds the rotors should be replaced
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most probable cause if the braking action is moderate is warped disc rotors
the warped disc pushes the piston in and out and that is the sensation at the pedal
if it is under sever braking , it will be the action of the ABS loosing and making pressure to stop wheel skid
get a proper diagnosis from an accredited brake specialist shop
if the discs are warped but within machinable limits , that may fix it for a while , otherwise get quality discs
Sounds like the brake pads may be worn out in the front. Make sure that there is not metal to metal contact that may score the rotors. Also, check the shoes and drums for the rear brakes if so equipped.
If you need instructions on how to disassemble, let me know.
There are 2 ways. It has rear drum in hat style brakes, meaning it has pads and rotors for basic brakes, but incorporated in the rotor is a drum with park brake shoes inside. Remove rear pads and rotors, check the condition of the park brake shoes. Tighten the star wheel adjuster while installing the rotor, keep repeating until rotor feels snug pushing on. Repeat other side reassemble. If still doesn't feel tight, there is an adjustment nut on the left rear side on the cable. The nut is where the 2 rear cables meet, it can be tightened. Do not tighten first, if you ever need park brake shoes later they will not allow the rotors to go back on.
Rear brake shoes as fitted to drum brakes can typically last up to 60k miles with periodic adjustments, but you have rear disc brakes and the shoes will typically last half of that.
Also, modern brake pads no longer contain asbestos and are now made using harder metallic compounds; the direct result is that brake discs (US=rotors) are also considered to be consumable items as they are worn down by the harder pads. It's not unusual to have to replace front discs every other pad change and rear ones with every pad change; in both cases the mileage will typically be around 30k miles on most models.
Parking brake is operated by a cable and not the caliper. Your car has disc brake pads for squeezing the rotor to stop, the parking brake has drum type brake shoes that push out on the inside of the rotor. Changing the disc pads only requires squeezing the piston back in like usual.
No you don't, you can have them turn the brake disk/rotor . Turning the brake disk/rotor is when you have the surface of the disk resurfaced by having a brake lath cut the high spots down.
The disk are cheap enough now that most will just replace the disk/rotor the same time they replace the brake pads. You can pick up performance drilled or slotted brake disk/rotor for almost the same price as the OEM disk/rotor.
Good luck and hope this helps, you can pick up the slotted brake disk/rotor at Auto Zone for a reasonable price and they will have the step by step instruction replacing the disk and if you like to just have the disk/rotor turned, they can do they there too.
hi sounds like a brake pulsation remove the brake rotors and make sure the hub face is clean of rust and the inside of the rotor reassemble the brakes and torque the wheel nuts to 100ft/lbs if it still pulsates then the rotor is warped some aftermarket rotors are warped from sitting on the shelf you can also check the laterial run out of the rotor with a dial indicator if you have one hope this helps