![]() ![]() The math involved in the initial planning of a brake system can get long and complicated. However, the manufacturers make plenty of engineering and metallurgy calculations behind the scenes before calipers get CNC machined or brake rotors cast. Some brake manufacturers do the same, so calipers and rotors often look similar across different brands. In racing, brake selection is often follow-the-leader: New competitors pay attention to what the top finishers are using. Although components often look similar across different brands, engineering behind the scenes ensures parts are optimized for the unique challenges of each racing genre. ![]() Wilwood recommends as close to a 50/50 front-to-rear brake bias as possible on these vehicles, so the calipers clamp with equal force. We are going to be testing some new Hawk Endurance track pads and our DBA slotted front rotors.Bailey Campbell is shown here competing in the 2020 King of the Hammers Ultra4 4400 Unlimited class running a 50/50 brake bias with equal line pressure to all four corners. I just did a full brake system freshening with new master cylinder and booster (GT3 parts), along with stainless lines. ![]() Here is our 1998 Boxster that I'm building for the 24 hour Champcar race at VIR this year. I raced Spec Boxster for a few years and did not have this happen to me or hear of anyone else with the same issue but I do know of some that had to replace calipers (though I'm not sure why). We have caliper rebuild kits for the rear calipers and I am checking on the fronts. I'm not saying this is why your inboard pads wore out so fast, but it is odd.Īlso make sure when bleeding to bleed the inside bleeder first, then the outside. They can glaze over your rotor if pushed hard too, I'd check the inside of your rotor to see what it looks like. I would look into running some track pads, street pads simply do not hold up on the track. I have seen "tapered" pad wear but not so much uneven from inside to outside, maybe a little but not a substantial amount like you mention. And look for uneven temp - fronts should be the same and rears should be the same. (Don't touch the brakes - it's normal for them to be hot and you'll burn yourself ). A hanging caliper will cause the wheel center to be warm. On a street driven car, a simple test is to take for a drive on the highway for a few minutes, then pull over and touch your wheel centers. You won't necessarily feel this as sticking brakes or see smoke unless it's an extreme case. On calipers haven't been rebuilt in a while, the pistons can hang up slightly and still apply modest pressure on the pad. So the root cause is that the pistons (in my case the inboard caliper pistons) do not fully retract and therefore the inboard pad is in contact with the rotor? Sounds plausible but I would have expect the brakes to smoke or at least smell burnt pad material when coming off the track and I didn't observe either.In normal circumstances the piston/pads retract only slightly so the pad isn't pressing on the rotor. Although I am not the original owner, I have a lot of service records and it doesn't look like the calipers have been rebuilt. Also I did not notice a large differential in pad wear with the last set of pads Why? I'd really like to fully understand the problem before going on to solutioning.Įdit: car gets regular (every 12 months +/-) brake fluid flushes with ATE Typ 200. Common advice is to rebuild the calipers. What are possible root causes for the highly uneven pad wear b/w inboard and outboard pads? There are a small number of threads discussing this and I am none the wiser after reading them. Sorry, no pictures I buttoned everything back up after digging into why the pad sensor warning light was on. I don't recall the ABS kicking in while on track I did brake pretty hard for T2 and T11. The rear pads both left and right show even, and limited wear inboard vs. The issue applies to both, left and right fronts, although it is more pronounced on the left than the right. Car: 1998 Boxster stock, 210K miles - only ABS and traction control, no other electronicsĪfter 1 track day (5 25-minute sessions) in low intermediate at Laguna Seca, on fresh ATE (street) pads, I am down to the pad sensor on the inboard front pads while the outboard ones have much less wear.
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