How do you know if you need to replace just the brake pads and the rotor, or just the brake pads? I hear a lot of mechanics tell you that you need to replace both, but how do you know if your rotor needs replacement?
2007-03-09 08:22:36 · 3 answers · asked by RFJ 3 in Cars & Transportation ➔ Maintenance & Repairs
I have replaced very few rotors as long as I have been driving cars. Automatic replacement of rotors is bunk and overkill. If they are badly grooved or warped, yes, they will need replacing. Most instances, replacement of the pads is sufficient (after all that is the designed consumable). Even a rough surface on a rotor will not adversely affect your braking. Many times the replacement rotors are more susceptible to warping (cheaper made from parts stores). If you replace the rotors, spend the extra money and get O.E.M. rotors from the dealer. On my 2002 Ford truck (with 125,000 miles), I allowed the pad to wear too long and it got into the rotor. The metal to metal contact grooved the rotor slightly, but I did not replace it or have it turned - I will just check my pads more often - so far, no problems at all. In contrast, I had a 1989 Buick that developed a wobble in the front end on braking - it was a warped rotor - I replaced the rotors, and all was well. The decision to replace the rotors is a judgment call, not a given. I hope this helps. Bottom line is - check your pads every 5,000 miles so that you can head off problems with the rotors.
2007-03-09 09:22:33 · answer #1 · answered by Doug R 5 · 0⤊ 0⤋
The mechanic should put a dial indicator on the rotor and measure the run out. That's how many thousandths of a inch the rotor is out of true. Next he use a micrometer to measure the thickness of the rotor. This will determine if they can turn or resurface the rotor and still have at least minimum thickness.
2007-03-09 08:55:54 · answer #2 · answered by Fordman 7 · 0⤊ 0⤋
90% of the time, you just need to replace the pads.
I wouldn't even bother replacing or resurfacing the rotors unless they are too think to use.
Have a shop inspect the rotors, most places will do it for free. it they check out okay with very little run out, just replace the pads only.
If there is runout, they will suggest turning the rotors..Never turn your rotors, replace them. But it should be the last time you replace them.
2007-03-09 08:28:08 · answer #3 · answered by Lemar J 6 · 1⤊ 0⤋