How often do i need to change/bleed brake fluid (DoT 5.1) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

dejxx · 04-30-2014, 07:36 PM

Quick question. I have done 2 track days, plus around 5.000km with Pentosin Racing Brake Fluid (DoT 5.1)... how often do i need to change/bleed this fluid??? Thanks!!!

speargunsandracecars · 04-30-2014, 08:04 PM

I do mine AT LEAST once every 6 months I run Motul RBF600, which is racing fluid, and is more prone to absorbing water. In general, racing brake fluids need to be replaced more often, even if mostly street driven. If tracked or autoXed regularly, even more often. If you're going to keep tracking your car, bleeding every 4-6 months, or when the fluid turns brown, or when it runs low, is a good rule of thumb.

B-R-Z · 04-30-2014, 08:29 PM

Brake fluid can run low? :-B

Malt · 04-30-2014, 08:33 PM

Quote:

Originally Posted by B-R-Z

Brake fluid can run low? :-B

Yep, when you use up brake pads there is a "drop" in fluid level.

B-R-Z · 04-30-2014, 08:35 PM

Quote:

Originally Posted by Malt

Yep, when you use up brake pads there is a "drop" in fluid level.

Oh in that sense, yes.

CSG David · 04-30-2014, 09:31 PM

How does your brake pedal feel? If it is not good, them change it. General maintenance from owner's manual requires change every year.

dejxx · 04-30-2014, 09:38 PM

brake pedal feels different (bit soft... brakes work well thou) if compare to how it was before the first track day... but that can be the pads and rotors right?
On an other fluid related question... Clutch feels a bit soft after the track days... nothing MAJOR, but a bit softer... what could be the reason for this?
Im a track noob, and even bigger mechanical noob... so sorry for dumb questions =)

Tainen · 05-01-2014, 01:58 PM

Quote:

Originally Posted by dejxx

brake pedal feels different (bit soft... brakes work well thou) if compare to how it was before the first track day... but that can be the pads and rotors right?
On an other fluid related question... Clutch feels a bit soft after the track days... nothing MAJOR, but a bit softer... what could be the reason for this?
Im a track noob, and even bigger mechanical noob... so sorry for dumb questions =)

Most definitely just have some bubbles in your lines. No biggie, just bleed them. Firm pedal feel will return with a quick bleed job.

cab33 · 07-11-2015, 10:22 AM

Is there a trick to getting the brake fluid out of the reservoir?
A turkey baster just reaches the top 20%.

fika84 · 07-15-2015, 11:50 AM

Quote:

Originally Posted by cab33

Is there a trick to getting the brake fluid out of the reservoir?
A turkey baster just reaches the top 20%.

If you're bleeding the brakes than you will just run it through the lines.. you don't want to run the master cylinder dry..

You can use the turkey baster to get it down and then fill it up with new fluid and bleed the brakes until you have new fluid in all the lines.

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04-30-2014, 08:04 PM	#2
speargunsandracecars Senior Member Join Date: Oct 2012 Drives: 2014 BRZ Location: Southern Pines/Triangle, NC Posts: 150 Thanks: 1 Thanked 92 Times in 42 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I do mine AT LEAST once every 6 months I run Motul RBF600, which is racing fluid, and is more prone to absorbing water. In general, racing brake fluids need to be replaced more often, even if mostly street driven. If tracked or autoXed regularly, even more often. If you're going to keep tracking your car, bleeding every 4-6 months, or when the fluid turns brown, or when it runs low, is a good rule of thumb.

04-30-2014, 09:31 PM	#6
CSG David Join Date: Aug 2012 Drives: S2000 CR Location: California Posts: 2,109 Thanks: 537 Thanked 1,721 Times in 956 Posts Mentioned: 173 Post(s) Tagged: 3 Thread(s)	How does your brake pedal feel? If it is not good, them change it. General maintenance from owner's manual requires change every year.

07-11-2015, 10:22 AM	#9
cab33 Member Join Date: May 2015 Drives: Fast Location: Central, FL Posts: 34 Thanks: 16 Thanked 4 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Is there a trick to getting the brake fluid out of the reservoir? A turkey baster just reaches the top 20%.

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