My Honda Civic 1993 GL 1.5 litre, twin carb car started making this grinding sound when I brake so I decided to remove the wheels and notice that my front right brake disc rotor were grinding away and it had large rough grooves.

I can not believe how hard it was to remove the two screws that hold the rotor, so I had to drill it out. I bought a new brake disc rotor and front disc pads set and the person at the store asked me if I was going to buy two brake disc rotors. I said no and she informed me that the new pads will wear out unevenly.

Should I buy the second brake disc rotor? Is what she is saying true? I was considering machining the brake disc rotor instead but I realised I had already damaged the holes when I drilled the screws out.

Am I better off buying a second hand brake disc rotor from the wreckers and installing that than install a new brake disc rotor on it's own?

Where do I get the Disc Retaining Screw that holds the brake disc rotor?

 

Post some pictures. Its difficult to judge the situation without seeing the extent of damage or wear.

 

This.

Also, I don't ever change a rotor unless I'm doing them in pairs. I've had replacing one by itself make a car feel really weird when braking, and if I can feel it, I'm certain it is adversely affecting braking performance, and brakes are one of the few things on a car I feel should always be at peak performance/capability. This is just my two cents of course, ymmv.

 

You can usually reuse a rotor if it didn't wear down to the metal. But like the other guy said, it works best to put two new ones on and be done with it. ALWAYS replace the brake pads as the complete set of 4.

You don't need to put the little screws back in. They are there mostly to keep the rotor from falling off the car on the assembly line. In normal use, the lug nuts hold the rotor on as well as the wheel.

 

Thanks everyone for their help! I have decided to install NEW rotors and disc brakes for the front wheels

 

I would probably check out the caliper sliders and piston too. If you had grooving on the old rotors, something might be sticking which will just destroy your new pads/rotors.

fyi, the trick to getting those retainer screws out is to use a hammer driver, pops them loose. Sears: Online department store featuring appliances, tools, fitness equipment and more