93CutlassSupreme Posted September 17, 2004 Report Share Posted September 17, 2004 as all the current members of this site know, i've had quite a saga with my brakes. anyways, i slaped on some reman front calipers, and changed all my rotors with Raybestos PG plus parts. my brake pedal still pulsates. yes, i bled the new calipers properly so far, i've replaced -front calipers -rear calipers -all rotors numerous times -all pads numerous times any ideas why my brake pedal still massages my foot, even with an almost totally new braking system? Quote Link to comment Share on other sites More sharing options...
99RegalGS Posted September 17, 2004 Report Share Posted September 17, 2004 did it pulsate when you first put the new rotors and pads on? Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted September 17, 2004 Author Report Share Posted September 17, 2004 did it pulsate when you first put the new rotors and pads on? possibly, the pedal was pretty soft, i couldn't feel much, so i re-bled it, and it hardened up. it's still softer than it was with the old calipers though. now there's a light pulsation in the pedal. the front end doesn't shake like it did before i changed the parts, but the pedal dances a little bit. Quote Link to comment Share on other sites More sharing options...
GPRACER Posted September 17, 2004 Report Share Posted September 17, 2004 It's not the abs cycling abnormally is it? Did you clean the hub to rotor contact surfaces. Rust between these 2 surfaces could cause lateral runout even on new rotors. anything over .002thousands of an inch lateral runout could cause a pulsation. Multiply that by 4 if you have 4 dirty hubs. Wheel torque? 100ft pounds for steel wheels, and 140ft pounds for alum. wheels. Incorect or uneven wheel torque could warp rotors prematurely. Just some suggestions? Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted September 17, 2004 Author Report Share Posted September 17, 2004 could be abs. some stops the pedal is very smooth, other stops it does pulsate. i always take a wire wheel to the hubs, i clean them the best i can. michigan winters really tear up cars, they're rusted. i torque my wheels in a criss-cross pattern, 100 lbs. Quote Link to comment Share on other sites More sharing options...
99RegalGS Posted September 17, 2004 Report Share Posted September 17, 2004 A possible cause that I could see is one of your calipers are dragging on the rotor and warping it as you drive it. I take that the caliper bushings are new also? Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted September 17, 2004 Author Report Share Posted September 17, 2004 A possible cause that I could see is one of your calipers are dragging on the rotor and warping it as you drive it. with new calipers? Quote Link to comment Share on other sites More sharing options...
99RegalGS Posted September 17, 2004 Report Share Posted September 17, 2004 Maybe the cailper mount is bent slightly, just enough to allow it to drag. Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted September 17, 2004 Author Report Share Posted September 17, 2004 Maybe the cailper mount is bent slightly, just enough to allow it to drag. hmmm. i hope not, i'm not paying $75 GM list for them. now that i think about it, abnormal abs cycling doesn't make sense, because the pedal always pulsates when i hit the brakes on the freeway. the faster i go, the more it pulsates. Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted September 17, 2004 Report Share Posted September 17, 2004 balljoint? tie rod? hub? steering problem? Quote Link to comment Share on other sites More sharing options...
GPRACER Posted September 17, 2004 Report Share Posted September 17, 2004 sounds like lateral runout to me then. I have the same rust problem here. I had to knock out my wheel studs and use a mini grinder to clean the hubs. Worked on the front, I had to replace the rears for abs problems anyways, but it fixed the pulsation problem. Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted September 17, 2004 Author Report Share Posted September 17, 2004 sounds like lateral runout to me then. I have the same rust problem here. I had to knock out my wheel studs and use a mini grinder to clean the hubs. Worked on the front, I had to replace the rears for abs problems anyways, but it fixed the pulsation problem. fuck it then. i'm not going through all that. i've spend enough time and money trying to resolve this problem. if that is the problem, i'll just live with a vibrating pedal until i can dump this car. Quote Link to comment Share on other sites More sharing options...
GPRACER Posted September 17, 2004 Report Share Posted September 17, 2004 Its not that hard! Imagine fixing brakes for a living, GM requires us to actually use shim plates to get rotors below .002 LRO. Major pain in the ass. Quote Link to comment Share on other sites More sharing options...
DiscoStudd Posted September 17, 2004 Report Share Posted September 17, 2004 How are your tires? They might be out of balance or worn down to the point where they're causing havoc on the suspension. If you've replaced everything pertaining to the brakes, then I'd focus on the wheels and tires next... Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted September 17, 2004 Author Report Share Posted September 17, 2004 Its not that hard! Imagine fixing brakes for a living, GM requires us to actually use shim plates to get rotors below .002 LRO. Major pain in the ass. i know that, i'm just distugsted with brakes on this car, and i'm not spending the money for new hubs. i can't believe GM actually engineered a braking system this poor, and used it for what, 5 years? Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted September 17, 2004 Author Report Share Posted September 17, 2004 How are your tires? They might be out of balance or worn down to the point where they're causing havoc on the suspension. If you've replaced everything pertaining to the brakes, then I'd focus on the wheels and tires next... my tires have less than 10,000 miles on them, and they're balanced. some of my wheels are in piss-poor shape, but they balanced out on the tire balancing machine. Quote Link to comment Share on other sites More sharing options...
Brian P Posted September 17, 2004 Report Share Posted September 17, 2004 surprised noone mentioned that sometimes NEW rotors can be messed up even new! Especially if theyre stored vertically. Also even warped REAR rotors would cause pedal pulsation, yeah! Quote Link to comment Share on other sites More sharing options...
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