Hi,
I recently replaced my rear calipers, rotors and pads on both sides of my car. The car is now making a metal to metal sound on the passenger side only when I brake. I took everything off (caliper, rotor and pads) and everything looks brand new. Before putting everything back I moved the dust shield away from everything and went out for a test drive only to hear the same noise.

I am thinking about putting my car on jacks all around and putting the car in drive to see what is going on. Do you think that would help?

The car drives and brakes fine. No pulling or anything. Just this noise. Also there is a lot of dust on the rims (a lot!) but nothing on the rotor, pads and calipers.

Any idea what it could be?

Jomo

 

take a vid of the noise

 

Brake wear indicator fingers different between left and right ?

Parking brake adjusted properly or not freely floating to a " off " adjustment ?

Long shot would be in the dark if a spark indication would give some information

Dust in your case indicate proper " seating " of the wheel to hub cylindrical center hub inner race or original factory turning with it's problems of of corrosion

Just throwing some ideas out there that someone can relate to and help

 

I will do that in the next day or two. Thanks.

 

Hi jomo,

Just thinking out loud like Parker:

We're assuming that after installing the new rear calipers you thoroughly bled all air from the system? If a little air remained in the passenger side caliper, it might not be clamping the rotor as forcefully as the driver's side caliper, leading to a dragging noise. You won't notice pulling to the right or left as much from unequal rear braking except when braking hard from higher speeds.

Did you bed in the new pads? To do so, I get the vehicle up to 45-60 mph and then brake firmly to a full stop, and repeat two or three more times. I find that new pads can often make noise until they are bedded in to polish off any roughness in the surface of their friction material.

Did you reinstall the anti-rattle clips (part 15 in the diagram below)?




Is the pad friction material ceramic or semi-metallic? The former tends to be a little quieter and to produce less dust.

Are the caliper guide pins (part 12) fully seated, and were the guide pin bushings (part 11) correct in the new calipers? If the guide pins aren't fully threaded in or if the bushings are missing or incorrect, the caliper can twist while braking.

Did you lubricate the caliper mounting bracket pad contact points and the pad ears with a little disc brake grease? I also apply a little copper-based anti-seize compound to the rim of the piston and the "fingers" of the caliper to help reduce pad squeal (there are other products that work well too).

Please let us know what you figure out. This is how we all learn.

Cheers,

Don

 

I pulled everything off on both sides, lubricated everything again put it all back together and the noise went away. Very strange but glad the noise is gone. But now my XJS has brake problems which is in another post.