I just changed my break pad on my 2002 jeef liberty and i still have a major grinding sound coming from the front. the rotors seem to look fine. could i possibly be the calipers? (a little more info. - it grinds when i drive and when i break.)

SOURCE: Brakes Squeak and grind - mostly when cold

This is a head scratcher! My first thought is the rotors. They have an oil film that needs to be degreased before being installed. That may be only part of the prob! My guess is that you hit open road in a short time?? The grinding, jack each wheel and rotate by hand, have your helper gently apply the brakes,[just slightly], this should lead you to the prob. Also check for movement in the wheel bearings. Check that the dust shields are clearing the rotor. If all this fails, remove the wheels and check the inside of the rims for any wear marks. This may be ever so slight. This is the best I can come up with at this time! Frankster016

SOURCE: 96 Ranger Grinding Sound Moving Forward

Did you check the rotors to see if they were cracked or 'thin' ? Rotors sometimes get really thin with use.And they can crack. Or as in one case that I know of there was sand between the rotor and the pads. The pads were also new. Removed the gravelly sand and they worked fine.

anwar alkhaldi

• 197 Answers
• Posted on Mar 15, 2009

SOURCE: 2003 sierra rear brake rotors

there is many kind of brake system of ur truck here i will send u everything about the brake and i hope its help

Rear Brakes JC3

Rotor Discard Thickness* 18.50 mm/0.728 in Rotor Minimum Allowable Thickness After Refinish 19.0 mm/0.748 in Rotor Thickness (new) 20.0 mm/0.787 in Rotor Maximum Allowable Lateral Runout 0.05 mm/0.002 in Rotor Maximum Allowable Scoring 1.50 mm/0.059 in Rotor Maximum Allowable Thickness Variation 0.025 mm/0.001 in
Rear Brakes JC4

Rotor Discard Thickness* 28.50 mm/1.122 in Rotor Minimum Allowable Thickness After Refinish 29.0 mm/1.142 in Rotor Thickness (new) 30.0 mm/1.181 in Rotor Maximum Allowable Lateral Runout 0.05 mm/0.002 in Rotor Maximum Allowable Scoring1 .50 mm/0.059 in Rotor Maximum Allowable Thickness Variation 0.025 mm/0.001 in
Rear Brakes JH2

Rotor Discard Thickness* 28.50 mm/1.122 in Rotor Minimum Allowable Thickness After Refinish 29.0 mm/1.142 in Rotor Thickness (new) 30.0 mm/1.181 in Rotor Maximum Allowable Lateral Runout 0.05 mm/0.002 in Rotor Maximum Allowable Scoring 1.50 mm/0.059 in Rotor Maximum Allowable Thickness Variation 0.025 mm/0.001 in
Rear Brakes JH6

Rotor Discard Thickness* 27.50 mm/1.082 in Rotor Minimum Allowable Thickness After Refinish 28.0 mm/1.102 in Rotor Thickness (new) 29.0 mm/1.141 in Rotor Maximum Allowable Lateral Runout 0.05 mm/0.002 in Rotor Maximum Allowable Scoring 1.50 mm/0.059 in Rotor Maximum Allowable Thickness Variation 0.025 mm/0.001 in
Rear Brakes JH7

Rotor Discard Thickness* 28.5 mm/1.122 in Rotor Minimum Allowable Thickness After Refinish 29.0 mm/1.142 in Rotor Thickness (new) 30.0 mm/1.181 in Rotor Maximum Allowable Lateral Runout 0.05 mm/0.002 in Rotor Maximum Allowable Scoring 1.50 mm/0.059 in Rotor Maximum Allowable Thickness Variation 0.025 mm/0.001 in
* All brake rotors have a discard dimension cast into them. Replace any rotor that does not meet this Specification. After refinishing the rotor, replace any rotor that does not meet the minimum or discard thickness specifications.

SOURCE: Front brakes grinding

sur it is a grind and not like the ABS is going off which could mean a sensor is bad or dirty .more like a pulsating growl

SOURCE: New brakes still making grinding noise

Sounds like it is your hub bearings.  Jack the car up and check for play in the hub bearings.  More than likely this is your issue and the bearings need to be replaced.  Hope this helps.  Thanks for an honest rating.