Brembo calipers leaking
10-05-2005, 05:45 AM
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Brembo calipers leaking
Hi there! I've been having a problem with my OEM Brembos during track days. This has happened on 100% of the track days I've been to.
FYI, I flushed and bled the system before this started, and use ATE Super Blue and Hawk HP+.
After a session or so, the pedal starts to get longer (happened faster at NHIS than at the Glen) and I start seeing fluid leaking from the bleeder valves. Unsettling, to say the least. There is never a LOT of leakage (basically undetectable from the master cylinder level, and even that is probably pad wear as well). In addition, I know that it continues to purge a bit after I stop, since at the height of the problem, I go to check tire pressures and torque lug nuts, and there is a little dribble of dried fluid sitting on the flat surface of the wheel (where it would drip if the car were stopped and you cracked a bleeder valve with no tubing).
I'm about 90% sure that the fluid is coming from the thread area of the bleeder screws, not through the channel. I say this because I'm pretty sure the rubber boot stays dry inside when this is going on. I also know that the fluid is not the leftover fluid in the bleeder screw from bleeding, because I wick that out with a paper towel after bleeding, as well as anything in the boot.
The bleeders are torqued to spec (9-11 ft-lb).
I've had people tell me they think the bleeder screw torque is too high, but I'm working out of the '03 manual. Hopefully it's not a typo and supposed to be in-lb. I've had people tell me I probably have dirt in the seat between the screw and caliper (unlikely, unless I managed to suck air AND dirt in on all 4 corners, since it happens everywhere).
Anyone else having this problem or have a solution? Thanks in advance.
uwaeve.
FYI, I flushed and bled the system before this started, and use ATE Super Blue and Hawk HP+.
After a session or so, the pedal starts to get longer (happened faster at NHIS than at the Glen) and I start seeing fluid leaking from the bleeder valves. Unsettling, to say the least. There is never a LOT of leakage (basically undetectable from the master cylinder level, and even that is probably pad wear as well). In addition, I know that it continues to purge a bit after I stop, since at the height of the problem, I go to check tire pressures and torque lug nuts, and there is a little dribble of dried fluid sitting on the flat surface of the wheel (where it would drip if the car were stopped and you cracked a bleeder valve with no tubing).
I'm about 90% sure that the fluid is coming from the thread area of the bleeder screws, not through the channel. I say this because I'm pretty sure the rubber boot stays dry inside when this is going on. I also know that the fluid is not the leftover fluid in the bleeder screw from bleeding, because I wick that out with a paper towel after bleeding, as well as anything in the boot.
The bleeders are torqued to spec (9-11 ft-lb).
I've had people tell me they think the bleeder screw torque is too high, but I'm working out of the '03 manual. Hopefully it's not a typo and supposed to be in-lb. I've had people tell me I probably have dirt in the seat between the screw and caliper (unlikely, unless I managed to suck air AND dirt in on all 4 corners, since it happens everywhere).
Anyone else having this problem or have a solution? Thanks in advance.
uwaeve.
10-06-2005, 09:31 AM
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04 Manual also shows 9-11. I have the non brembo and torque them at 61-77 in-lbs per the manual which is about half of the Brembos. In comparable units:
Brembo: 12-15 N-m
Non Brembo: 6.9-8.8 N-m
Brembo: 12-15 N-m
Non Brembo: 6.9-8.8 N-m
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