03CL55AMG Posted November 7, 2013 Report Share Posted November 7, 2013 I Just finished rebuilding all 4 calipers of course new hawk pads, deglazed the rotors and bled system...when I pulled the rear pads out, the wear patteren was messed up...top of the pad on both sides of the car had good meat left but the bottom of the pad was nearly to metal. I have not run onto this before, I did a little reserch and all I could find was the concencus said worn bushings or worn brake parts, I did not see any bushing and I am not sure where to look...checked the pads after 50 miles and it looks as if the wear pattern is not normal starting to look like old pattern...has anybody run into this before and if so what was the cause, thanks. Link to comment Share on other sites More sharing options...
Squrlsquash Posted November 8, 2013 Report Share Posted November 8, 2013 I've heard that not greasing the actuating pins (that slide back and forth) can cause noise and whatnot,if one were stuck, applying the brakes would only push one side onto the rotor seems odd to happen on both simultaneously im sure you'll get some better information out of members with more brakes experience- but it sounds like a caliper actuating problemgood luckAaron Link to comment Share on other sites More sharing options...
kidjc Posted November 8, 2013 Report Share Posted November 8, 2013 I think it might be wise to swap out those hawk pads for a less expensive set until you get it straightened out? Try going back to a semi-metallic front & organic rear, a cheaper way to figure out if the wear pattern is consistent w/ the different materials? I've also seen wear similar if the caliper is worn to the points where sides are shifted from (like stated) (1) or more of the actuating pins set differently/causing an angle. (make sense ) It does sound "caliper" oriented though? I mean warped discs that badly, don't think so? Either something isn't lining up properly, or uneven pressure. Just too odd... it happening simultaneously? Good luck, really haven't experienced this same situation to have a quick fix for you. Link to comment Share on other sites More sharing options...
03CL55AMG Posted November 8, 2013 Author Report Share Posted November 8, 2013 (edited) Thanks guys, good thought process, the pins that I took out during the rebuild looked like new...no unusual wear. It is definetly some uneaven wear and it is just the rears the fronts are looking good, that is wear the hawk pads are and some organic in the rears. I will keep checking but any additional ideas are welcome,thanks. Edited November 8, 2013 by 03CL55AMG Link to comment Share on other sites More sharing options...
JohnnyWadd Posted November 8, 2013 Report Share Posted November 8, 2013 (edited) Its just like a tire or the bottom of your shoe. Any angle that is not at 90 degrees will cause uneven wear. You got bent brackets or bent sliders making the pad clamp harder in one spot. Edited November 8, 2013 by JohnnyWadd Link to comment Share on other sites More sharing options...
wrngwae Posted November 9, 2013 Report Share Posted November 9, 2013 did you make sure on the rear pads that the little pins on the pads fit into one of the little triangle grooves in the caliper piston? you have to rotate the piston to line up on the pads. Link to comment Share on other sites More sharing options...
tsi_tom Posted November 9, 2013 Report Share Posted November 9, 2013 I would say that there is rust at the bottom of the bracket where the pads sit and are binding. The pad should slide evenly in the bracket. Link to comment Share on other sites More sharing options...
Amonje123 Posted November 9, 2013 Report Share Posted November 9, 2013 Also make sure theres not to much grease in sliders. If theres to much, the grease will create a suction affect(vaccum). And the calipers wont move in and out right. Link to comment Share on other sites More sharing options...
Malykaii Posted November 9, 2013 Report Share Posted November 9, 2013 ^ agree. And some cars have rubber dampeners on one of the sliders... so if you have that, make sure its not swelled up or stuck somewhere in the bracket. Link to comment Share on other sites More sharing options...
03CL55AMG Posted November 13, 2013 Author Report Share Posted November 13, 2013 (edited) Good info guys, I did not notice that the brackets were bent they looked normal..I did put a thin layer of greese on the bolts as well as on the outside of the pads and I cleaned up all the parts of the brakes durning the rebuild...How about this, is it possible that the ABS could cause this problem, I know this doesn't seen likely but it's worth asking and yes I did line up the little pins on the pads so they hit in the triangle of the piston, thanks for the responces Edited November 13, 2013 by 03CL55AMG Link to comment Share on other sites More sharing options...
87B71Brad Posted November 15, 2013 Report Share Posted November 15, 2013 A ranger just came in at the shop. Had the whole front end knocked off. Anyways she claims her brakes weren't metal to metal till the accident..total bs if you ask me. Just some inbred wanting something for nothing. Pulled caliper and one pad had 1/2 life the back pad was gone. Had to put new rotor and pads on. And you wonder why insurance companies rates are so high..lol All this said I can't figure out why it wore funny like this. Other than the pads not being able to "move"..or "slide" correctly. I'd say grease it up and try again. Link to comment Share on other sites More sharing options...
87B71Brad Posted November 15, 2013 Report Share Posted November 15, 2013 Talked to mechanic he said its more than likely your caliper sticking. Something about a ring inside it. Thought I'd share what he said. Link to comment Share on other sites More sharing options...
Amonje123 Posted November 15, 2013 Report Share Posted November 15, 2013 The o ring inside the caliper keeps the oil inside the unit. A caliper sticking is the same as touching the break while driving. It will where out pads but wont make pads wear un-even. Uuuummmmm unless only half the piston is sticking. I havent seen that yet. Link to comment Share on other sites More sharing options...
03CL55AMG Posted November 16, 2013 Author Report Share Posted November 16, 2013 (edited) How about this could it have anything to do with the parking brake...it is only the rear brakes maybe the cable is sticking and that is cousing the abnormal wear...hmmm Edited November 16, 2013 by 03CL55AMG Link to comment Share on other sites More sharing options...
Amonje123 Posted November 16, 2013 Report Share Posted November 16, 2013 I have an idea try jacking up the rear tires on the ground. Support car so it wont fall. Remove tires have a friend get in the car put in gear and start driving. While driving apply brakes and look closely and see how calipers are moving. You can check with the e brake also. And go from there. Link to comment Share on other sites More sharing options...
03CL55AMG Posted November 17, 2013 Author Report Share Posted November 17, 2013 That is worth a try and may lead to some answers, good thinking. I will post the results. Link to comment Share on other sites More sharing options...
Indiana Posted November 17, 2013 Report Share Posted November 17, 2013 Does your parking brake work?Did the screw posts in the pistons turn?Are the cable levers moving?Do the cables stick? Take that proportioning valve off the firewall, take the cap off and remove the spring and piston out and clean the rotten crap out of it. Don't get sold new hoses because of this issue. This clogged up valve will cause those rear calipers to stick. If the ABS modulator is still there, you have to bleed the crap out of it too. Link to comment Share on other sites More sharing options...
03CL55AMG Posted November 19, 2013 Author Report Share Posted November 19, 2013 (edited) Thanks Indy...that sound like a great place to start. I did bleed the ABS modulator pretty well when I bled the brakes as shown in the FSM. Edited November 19, 2013 by 03CL55AMG Link to comment Share on other sites More sharing options...
Shelby Posted November 22, 2013 Report Share Posted November 22, 2013 Does your parking brake work?Did the screw posts in the pistons turn?Are the cable levers moving?Do the cables stick? Take that proportioning valve off the firewall, take the cap off and remove the spring and piston out and clean the rotten crap out of it. Don't get sold new hoses because of this issue. This clogged up valve will cause those rear calipers to stick. If the ABS modulator is still there, you have to bleed the crap out of it too. hey old man good to see you posting again only other thing I can sugest is to take it all apart again leave the pads off,, install caliper on guide pins and see if you can rock the caliper,, if it is loose on the guide pins it'll wear off center ,,bent guide pins are rare but they can be bent with a BFH and a couple buds lol Link to comment Share on other sites More sharing options...
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