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Re: I am trying to replace the front rotors on a 2003...
Your Vibe may have phillip screws that hold the rotor to the hub you need to remove first, my 2004 did not, but because Pontiac uses Toyota brake parts on the 2003's you may have them. Use the right size phillips screw driver with a very good point and don's strip them.
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I'd start with seeing if vibration is there at all speeds...I'm assuming vibe is felt thru steering.
Usually vibes at different speeds can be tires. (bubbles or worn)
Vibes at all speeds can be tires, rims either out of balance (slung weight or dirt inside rim) or warped wheel (curb tap).
I'd check your tires, rims and alignment first...then move to possible warped rotor where brake caliper may catch a little.
once the caliper and bracket are removed, the rotors should just come off. These are hat style rotors and just slip over the hub. They do have a tendency to rust on, sometimes hitting them with a hammer between the studs will break them loose. some rotors have threaded holes between teh wheel studs that you can screw a bolt into to break them free.
If there are no fluid leaks than I would bet you replaced the master cylinder with a re-manufactured unit instead of new. The re-manufactured ones are fine as long as you don't mind trying several of them to get one that works. If it is re-manufactured return it and get a new master cylinder.
To remove the brake rotor, you must first remove the brake pads and caliper. There are two bolts that hold the brake caliper in place. Remove the two bolts and tie the caliper up out of the way. Be careful not to break the brake line connected to the back of caliper. Once the caliper is removed, simply slide the rotor off. To install a new rotor, simply slide rotor over studs and replace the caliper with new brake pads. It is as simple as that.
I believe on your vehicle they are an actual hub assembly, should be able to look behind the backing plate (behind the rotor) and see if there are 3 - 4 bolts holding the hub on, should alo have the ABS wire connected to it also, should be all one assembly. Hope this helps