A year ago I put on a pair of new front rotors. Since then my brakes feel spongy. System has been bled several times. The brake pads have excessive clearance to rotor (about 0.5 to 1 mm) , especially inner pad(both sides of truck the same). Calipers slide fine on the sleeves, but the pistons go back into the bores as soon as I lift my foot off the brake pedal(checked it when parked). Tried various bed-in procedures. Replaced master cylinder, calipers twice, flexible lines. Dial indicator measurements are: 1. Rotor runout outside-0.0035, inside-0.004. 2. Wheel bearing play - 0.0025. All to spec. I don't have a micrometer to measure rotor thickness variation. Rotors are now glazed, but very smooth, no grooves. To save money I used old brake pads(they had a lot of life left in them). Could the old pads be the problem? Should there not be residual pressure in the brake lines to keep the pads close to the rotors? Did I ruin the rotors?
have the same problem?
Saturday, January 11th, 2014 AT 10:08 AM