advice needed on brake issue

travisjb · 08-18-2009, 12:10 AM

I had issues running with bone stock setup and later with ATE blue/gold and Hawk HP+ pads but stock sport calipers/rotors... the issue became progressively more noticeable during sessions, and only occurred at the end of the infield heading into a hairpin, while decelerating from ~100 to ~30. I definitely had enough advanced warning as it progressively got worse with each lap. I would say that I gained ~20-40% stopping distance, so it wasn't like I lost all brake pedal. ie I was never at any time at high risk of ending up in wall but at the same time I had to back down a be less aggressive once it started happening

Having said all that, I'm a lot more comfortable with brakes that work! hence the upgraded bbk

I'm very interested to find out if the ducting eliminates the issue for you... several of us have theorized that the problem with the stock setup is heating (duh!).... essentially calipers and surrounding materials getting excessively hot, not dissipating efficiently, and heat spreading to sensors that input to ABS cpu. As a result, the ABS is pulsing at a very slow rate and causing an ABS-like braking condition but with much longer stopping distances. It feels like stopping on ice with ABS, which is why some have described it as 'icing' or whatever

boosted180 · 08-18-2009, 07:01 PM

Quote:

Originally Posted by travisjb

I had issues running with bone stock setup and later with ATE blue/gold and Hawk HP+ pads but stock sport calipers/rotors... the issue became progressively more noticeable during sessions, and only occurred at the end of the infield heading into a hairpin, while decelerating from ~100 to ~30. I definitely had enough advanced warning as it progressively got worse with each lap. I would say that I gained ~20-40% stopping distance, so it wasn't like I lost all brake pedal. ie I was never at any time at high risk of ending up in wall but at the same time I had to back down a be less aggressive once it started happening

Having said all that, I'm a lot more comfortable with brakes that work! hence the upgraded bbk

I'm very interested to find out if the ducting eliminates the issue for you... several of us have theorized that the problem with the stock setup is heating (duh!).... essentially calipers and surrounding materials getting excessively hot, not dissipating efficiently, and heat spreading to sensors that input to ABS cpu. As a result, the ABS is pulsing at a very slow rate and causing an ABS-like braking condition but with much longer stopping distances. It feels like stopping on ice with ABS, which is why some have described it as 'icing' or whatever

thanks for the clear explanation. on sunday after the auto-x, i did multiple hard stops from about 60-70mph, trying to get as much heat as i can into the brakes. i did a total of 7 stops, no breaks in b/t. each one stopping as quick as i could, jsut on the threshold of locking up. i could feel no difference in brake effectiveness from fist stop to 7th stop (in fact the later stops were probably better). i wish i had a brake pyrometer to measure actual temps, but my friend didnt bring his.

maybe the problem may still show up at the track, but maybe this is just a "freak problem" on *some* unlucky cars?? LOL. wishful thinking.....

i'll find out when i'm at streets of willow next month.

08-18-2009, 12:10 AM	#1 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 190	I had issues running with bone stock setup and later with ATE blue/gold and Hawk HP+ pads but stock sport calipers/rotors... the issue became progressively more noticeable during sessions, and only occurred at the end of the infield heading into a hairpin, while decelerating from ~100 to ~30. I definitely had enough advanced warning as it progressively got worse with each lap. I would say that I gained ~20-40% stopping distance, so it wasn't like I lost all brake pedal. ie I was never at any time at high risk of ending up in wall but at the same time I had to back down a be less aggressive once it started happening Having said all that, I'm a lot more comfortable with brakes that work! hence the upgraded bbk I'm very interested to find out if the ducting eliminates the issue for you... several of us have theorized that the problem with the stock setup is heating (duh!).... essentially calipers and surrounding materials getting excessively hot, not dissipating efficiently, and heat spreading to sensors that input to ABS cpu. As a result, the ABS is pulsing at a very slow rate and causing an ABS-like braking condition but with much longer stopping distances. It feels like stopping on ice with ABS, which is why some have described it as 'icing' or whatever __________________ 2009 370Z #104 For Sale Last edited by travisjb; 08-18-2009 at 12:12 AM.

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