Help identify this grinding noise please. Have video
09-13-2012, 04:40 PM
#17
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The pads only retract a tiny bit when you let off the brakes, they are normally just a hair's width off the rotor. Anything sticking in the caliper or piston can hold them up against the rotor enough to make noise. It isn't uncommon with brand new pads, esp. if the caliper pistons haven't been that far back in their bores for a while. The tiniest bit of rust or corrosion... worse if the dust seals are bad.
09-13-2012, 04:42 PM
#18
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Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Well according to the POs paper work the caliper was replaced 40,000 +/- miles ago and the pads are like 17, miles in? I just took the rotors to be turned because they neeeded it anyways? Should I change the pads they look crappy IDK but I was thinking of picking up the lifetime ceramic pads from autozone.
09-13-2012, 08:22 PM
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No I meant bedding like braking them in. Anyways got the new pads on and the rotors turned and now its still rubbing it pretty good hard to turn. My father in law said he thinks it the caliper anyone else have an opinion? Thanks
09-13-2012, 10:08 PM
#23
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Bedding them is supposed to seat the pad to the rotor, but I've never bothered. Hasn't made a difference that I've noticed.
A couple things to check:
The knuckle ledges where the edge of the pads sit (see drawing below)- are they smooth? Not rough or notched? Pads have to be able to slide on that ledge. After some miles they can develop a notch the pads catch on.
Does the caliper itself slide without sticking or binding?
How are the rubber brake lines? Sometimes they flake inside and create a one-way valve that holds the caliper.
A couple things to check:
The knuckle ledges where the edge of the pads sit (see drawing below)- are they smooth? Not rough or notched? Pads have to be able to slide on that ledge. After some miles they can develop a notch the pads catch on.
Does the caliper itself slide without sticking or binding?
How are the rubber brake lines? Sometimes they flake inside and create a one-way valve that holds the caliper.
09-13-2012, 10:19 PM
#24
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Bedding them is supposed to seat the pad to the rotor, but I've never bothered. Hasn't made a difference that I've noticed.
A couple things to check:
The knuckle ledges where the edge of the pads sit (see drawing below)- are they smooth? Not rough or notched? Pads have to be able to slide on that ledge. After some miles they can develop a notch the pads catch on.
Does the caliper itself slide without sticking or binding?
How are the rubber brake lines? Sometimes they flake inside and create a one-way valve that holds the caliper.
A couple things to check:
The knuckle ledges where the edge of the pads sit (see drawing below)- are they smooth? Not rough or notched? Pads have to be able to slide on that ledge. After some miles they can develop a notch the pads catch on.
Does the caliper itself slide without sticking or binding?
How are the rubber brake lines? Sometimes they flake inside and create a one-way valve that holds the caliper.
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