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04-28-2012, 10:09 PM | #1 |
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How often do you bleed your brakes?
If I'm using stock calipers w/ track pads and high temp fluid, am I good just getting the fluid replaced after 3 events or so?
Or should I be bleeding after each one? |
04-28-2012, 11:10 PM | #2 |
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If running Castrol or Motul 660, I only bleed out the air when there's any, then do a complete flush after 6-8 track days.
If running Motul 600 or similar level brake fluid, 2 days max. |
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04-29-2012, 01:27 PM | #3 | |
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I'm trying to decide whether I should go ahead and buy a power bleeder. Or whether I can just flush every 6 track days. |
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04-29-2012, 01:35 PM | #4 |
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Go ahead and get a power bleeder. They are only like $50 at Turner or amazon. Makes it very quick and simple to bleed your own brakes ( very little time once you get the wheels off).
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04-29-2012, 01:37 PM | #5 | |
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Decent fluid (ATE or similar) is cheap enough and bleeding the system is easy enough to bleed at least before each 2 day event for me. I never liked the power bleeder, I have one and I still use the old fashioned 2 person method. My brakes felt consistently less hard when I used the power bleeder so I quit using it. |
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04-29-2012, 06:14 PM | #6 |
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Well, let me ask everyone - How many times have your brakes failed due to lack of fluid bleeding or changing? I have run a complete HPDE season, 10, 2 day events with the same fluid. I change fluid when I change pads and/or other brake components. I have yet to have a problem. But, I have not experienced any brake situations either since I changed to better pads and ss brake lines.
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04-29-2012, 06:29 PM | #7 | |
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What fluid do you run? Some are not very hydroscopic and can be left alone longer, although I've never heard of 20 days without bleeding/flushing. EDIT: Based on the couple of replies after me, several E9X M3 track guys get away with your bleed/flush interval. Maybe the racecar crowd I'm used to is overly cautious or stress the brake system more? Last edited by Porschefile; 04-29-2012 at 08:06 PM.. |
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04-29-2012, 06:54 PM | #8 |
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I flush the entire system once a year in the spring with OEM fluid.
I do about 15 track days per season. I always have my vacuum bleeder with me at the track just in case, but I have never needed it. I never needed to bleed the brakes, good pedal throughout the season. Never lost brakes either. The tracks I run are good for about 135mph. I run el-cheepo Hawks HP+. Last edited by CanAutM3; 04-29-2012 at 06:59 PM.. |
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04-29-2012, 07:53 PM | #9 |
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Usually at the start of our season with Motul 600.Never had an issue with poor pedal due to fluid.I have a Stoptech 380/355 BBK and I am quite careful about a cooloff lap to bring the brake temps down before parking the car.I have a lot of fluid boiling issues with parking with hot brakes over the years.Never had an issue with fluid on my 08 with stock brakes.I run a Pagid RS14/29 setup and I am quite aggressive on my brakes.I usually run 15-20 days per year.
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04-29-2012, 08:01 PM | #10 | |
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04-30-2012, 09:05 AM | #11 |
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I run ATE Super Blue Racing fluid, boiling point 280 d C. I run PF pads with stainless steel lines on stock rot. and cal. I tend to brake late and hard, so the brakes are not babbied, but they are not abused either. Cool down after a session is taken very seriously- no brake application after the checker during the cool down lap, including entry into the paddock.
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04-30-2012, 11:45 AM | #12 | |
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However, you need to feel if there's any air in the system. |
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04-30-2012, 11:45 AM | #13 | |
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04-30-2012, 03:12 PM | #14 |
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04-30-2012, 03:37 PM | #15 |
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A lot of us around here ran the HP+'s till we all got BBKs with no great issues besides the noise on the street.They worked much better than the stock pads.Stepping up the the Pagid RS19's with the stock brakes was a step up and overall worked OK on the track with being somewhat agressive.
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04-30-2012, 06:34 PM | #16 |
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I used Hawk H10 Gold on my 525 for years, with absolutely no issues or problems. Found them to be great pads.
But based on some of the comments here, I decided to go with Performance Friction pads on stock cal and rot, and have not had any problems there either. Knock wood I guess. vz
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04-30-2012, 07:09 PM | #17 | |
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I've always heard HP+ is the best autox pad but not so predictable for track.
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04-30-2012, 07:22 PM | #18 |
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Yup...and not running your pads down to back plates. You'll transfer more heat to the fluid since there is less pad material to absorb some of the heat.
I usually go about 2-3 weekends on Motul 600 before I flush. Motul 600 is good until you boil it. After that, you must flush.
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04-30-2012, 07:38 PM | #19 | |
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04-30-2012, 09:51 PM | #20 |
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I'd say as often as you feel a soft pedal. This question is so variable based on brake fluid, track, braking technique (and obviously car). I haven't run the E9x M3 on the track, but I'd say on average you'd likely be okay doing 3 events before bleeding, assuming those 3 are in one calendar year.
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04-30-2012, 10:08 PM | #21 | |
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3 days on my current fill of Motul 600. Let's see if I can get a 4th.
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04-30-2012, 10:48 PM | #22 |
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Yeah, no kidding I guess. That's why I finally added an ST-40 to the R32 this year. Almost no amount of bleeding could keep the soft away, and losing time at Road America (my favorite track) last year was the final straw.
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