Ludwig Posted October 24, 2005 Report Share Posted October 24, 2005 I recently installed new brake pads and rotors on all 4 wheels. It all went well with noticeably smooth and powerful breaking while driving. At a garage inspection however, they now found the rear breaks to be performing at an all time low - about halve the power as before. (The front ones are now top-notch.) Can the brake performance (ever) go up later as the disk and pads are worn down? Or could this be caused by a bad pad - disc combination? (rotors: Raybestos PG PLUS, pads: Raybestos Superstop) The previous, more powerful rear brakes were original GM replacement parts. 92 SevilleTS Link to comment Share on other sites More sharing options...
speedyman_2 Posted October 24, 2005 Report Share Posted October 24, 2005 If someone at a garage found them to be performing worse than OEM how did they come about this by looking at them??? This might not be a brake pad/Rotor problem. Maybe a problem with the lines, cylinders, fluid, etc. Another thing to consider, were these new brakes "seated in" properly?? Link to comment Share on other sites More sharing options...
jackc Posted October 24, 2005 Report Share Posted October 24, 2005 I recently installed new brake pads and rotors on all 4 wheels. It all went well with noticeably smooth and powerful breaking while driving. At a garage inspection however, they now found the rear breaks to be performing at an all time low - about halve the power as before. (The front ones are now top-notch.) Can the brake performance (ever) go up later as the disk and pads are worn down? Or could this be caused by a bad pad - disc combination? (rotors: Raybestos PG PLUS, pads: Raybestos Superstop) The previous, more powerful rear brakes were original GM replacement parts. 92 SevilleTS I'm not sure I understand your post. It seems like you start out by saying that the brake job you did went fine and that the brakes were "smooth and powerful" when you were done. But then a shop told you they "were performing at an all-time low"??? Did something change in how the brakes feel to you? I'm either misunderstanding, or thinking this shop is just trying to get in your wallet........ Link to comment Share on other sites More sharing options...
Ludwig Posted October 24, 2005 Author Report Share Posted October 24, 2005 I recently installed new brake pads and rotors on all 4 wheels. It all went well with noticeably smooth and powerful breaking while driving. At a garage inspection however, they now found the rear breaks to be performing at an all time low - about halve the power as before. (The front ones are now top-notch.) Can the brake performance (ever) go up later as the disk and pads are worn down? Or could this be caused by a bad pad - disc combination? (rotors: Raybestos PG PLUS, pads: Raybestos Superstop) The previous, more powerful rear brakes were original GM replacement parts. 92 SevilleTS I'm not sure I understand your post. It seems like you start out by saying that the brake job you did went fine and that the brakes were "smooth and powerful" when you were done. But then a shop told you they "were performing at an all-time low"??? Did something change in how the brakes feel to you? I'm either misunderstanding, or thinking this shop is just trying to get in your wallet........ While driving, it's all fine and has instant pedal response etc. That being said it's the overall performance and doesn't say what's the matter with rear braking. Air in the brake lines drops out, i think since there were similarly bad parking brake readings. They've been used for about 2000 miles now, so they should be well seated, there's no delay to brake response or anything. The device they used was a moving ground of 2 turning bars per wheel, running them at say 20mph speed, then once they hit the brake pedal and it displays what the brake force was. Anyways they said it was still within acceptable range. It's just that i expected more, a mystery. Link to comment Share on other sites More sharing options...
Scotty Posted October 24, 2005 Report Share Posted October 24, 2005 Did you resurface your rotors? Did you BED them? If they are not bedded correctly you may not have seated them good, I would re-bed them, search on this site for procedure. Its possible that the rear needs bleeding. Link to comment Share on other sites More sharing options...
jackc Posted October 24, 2005 Report Share Posted October 24, 2005 It sounds like they're running it on a dynomometer. How do the brakes feel to you? How does the car handle a panic stop? Do you get excessive nose-dive, or does the rear-end feel like it it wants to come around? Personally, if the answers to the above questions are great, fine, no, and no, - and I was happy with how the brakes perform overall - I'd forget about these guys and enjoy my car. What led you to have them do this test, anyway? Link to comment Share on other sites More sharing options...
Ludwig Posted October 24, 2005 Author Report Share Posted October 24, 2005 It sounds like they're running it on a dynomometer. How do the brakes feel to you? How does the car handle a panic stop? Do you get excessive nose-dive, or does the rear-end feel like it it wants to come around? Personally, if the answers to the above questions are great, fine, no, and no, - and I was happy with how the brakes perform overall - I'd forget about these guys and enjoy my car. What led you to have them do this test, anyway? Actual breaking feel is perfect, no pulls to either side, no delays, not much nose-diving. I'll not touch them now, that's for sure, there's much worse defects on the vehicle to take care of. The test was part of scheduled safety inspections that are mandatory in my state, but as said, it was still rated ok. Link to comment Share on other sites More sharing options...
adallak Posted October 24, 2005 Report Share Posted October 24, 2005 Does the shop knowthat the rear brakes do only some 20% of braking? Front brakes do some 80%. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
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