I was just wondering if maybe this happened to anyone else or if my Jag was just posessed. I noticed not ago my brakes were starting to give a little wine under heavy braking. I took it to get looked at at Brake King, and they told me the brakes were bad, and I needed new rotors also.

So I finally went to change them out with my dad the other day. Turns out the pads WEREN'T going bad at all (though we put on new pads just in case). The rotors were WARPED and kinda shaped like this [ with a lip forming around them. So we had the rotors turned and reinstalled them with the new pads.

Everything sounds perfect and I should be good to go right? WRONG!!! Now I can hear the slight sounds of the rotors spinning when I drive at low speeds. Can someone tell me if this is just part of the break in process for the new pads etc, or am I going to have to look deeper into the setup?

I know when I did my big brake upgrade on my old 240SX I had a similar problem, but it was because of the massive rotors that were in place of the normal O.E.M. rotors. Anyone with any ideas?

 

Cutting jags rotors is not recommended. If you put aftermarket pads in and the rotor turning job was subpar, you'll get some noise.

 

miss match in material will do it

 

when I had changed out my front brakes, pads, rotors, calipers, I was hearing very strange noises. the brake place just re adusted them several times and no more noise.

 

Just to be safe, i'd pull the calipers off with the pads, clean them to make sure you didn't get a piece of debris between the rotor and pad, and reinstall them. If the new pads are not set properly also, they'll be touching the rotor w/out pedal input. Maybe need a brake bleed too? Caliper piston may not have retracted all the way?

 

Thanks for the advise everyone. I'll try and see if I can't take it to get checked out. I'll take them off and readjust every other weekend I get a chance.

It seems as if whenever they start to heat up, I can't hear them making noises. But this isn't something that you'd expect from stock style rotors anyway. I know I got the same issue with my big brake upgrade on the old 240 but that's because I had oversized slotted rotors and performance pads. Those ones made noises until they heated up to the proper operating temps.

...more reasons why I wish I was still working on a project car... too bad I can't start working on cars again till I graduate. [:-]

 

I had NTB (National Tire & Battery) turn my stock rear rotors without any issue. In fact, it corrected an uneven, noisy condition.

Can you explain why the jag rotors aren't suppposed to? Are they 'turned for life' or something? sorry, couldn't resist that one. [sm=smiley36.gif]

 

Typically, there isn't enough meat to rotor. Turning them generally leaves them under spec, too thin. The boys at NTB should have mic'd the rotors to insure they did not turn them down too far. It's a safty issue.

ps--I like the "turned for life" comment. That was good![sm=roll.gif]

 

Good point, they never told me about the micrometer reading, and they're generally pretty good at upgrading any repairs w/ items such as that. I do like my rotors with some meat. Last turn for those guys I suppose. New ones in 30,000 miles or so with the next batch of pads.

 

I would doubt that they turned them too far down. First, becasue of the saftey issue and liablity. Second, as you stated, to up the sale.

 

The XK up to 2006 was ok to cut except the Brembos and same with XJ up 2005 Brembo excluded. 2006 XJ, S-Type and 2007 Xk they changed the brake rotor material. Very hard metal and if you cut them they tend to squeel. I have never cared for the S-Types rotors to be cut as Ken said, they are pretty thin already, not dangerously, but cutting them makes them that bit thinner and prone to heating up and squeeling and warping.

My own personal cars, I NEVER cut the rotors. Always replace. For what they cost these days, I have a 3 1/2 year old that I like to keep safe.

 

Thanks for all the added imput. I actually have a set of fresh rotors already purchased. But they're at home, and I'm in VA right now. [>:] Worse comes to worse, I can always intentionally wreck it, and blame it on faulty equipment and use the money leftover to get an S2K and have a new track practice car..... Wait.... No that wouldn't be a good idea either. LOL