911 Brake Fluid Flush - How often?
#1
![Question](https://rennlist.com/forums/images/icons/icon5.gif)
No listing in manual for 991.2 (MY2019 C2S)
For Macan, Porsche has every 2 years regardless of miles in service schedule. For 911, it is not mentioned.
I am ~ 1 month away from 2 year oil change & I tested % water & it is 0%.
I’m in a dry climate.
I have seen nothing re problems with brake fluid other than moisture content, which of course is an issue & the main reason to change it.
I have also heard that since brake fluid does not circulate, measuring water % at the brake fluid reservoir does not give you a true test of the moisture content at the calipers & elsewhere in the system.
It may not circulate but, I assume it mixes some.
Comments?
For Macan, Porsche has every 2 years regardless of miles in service schedule. For 911, it is not mentioned.
I am ~ 1 month away from 2 year oil change & I tested % water & it is 0%.
I’m in a dry climate.
I have seen nothing re problems with brake fluid other than moisture content, which of course is an issue & the main reason to change it.
I have also heard that since brake fluid does not circulate, measuring water % at the brake fluid reservoir does not give you a true test of the moisture content at the calipers & elsewhere in the system.
It may not circulate but, I assume it mixes some.
Comments?
#3
Three Wheelin'
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
My Indy does the moisture test and either replaces the fluid or says everything is OK....I tend to go three years based on the last 4 Porsche’s.
#4
Burning Brakes
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
The manual says 2 years but I think it's overkill. If you track it, you'll probably want to flush it more often. Mine is exactly 2 years old. I tested for water in the brake fluid and came out 0%. I'll give it another year and see.
#5
Banned
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 26,141
Likes: 0
Received 5,413 Likes
on
2,516 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Set aside your brake fluid for a moment. Why is your oil 2 years old? That's a bigger issue.
#6
Banned
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 26,141
Likes: 0
Received 5,413 Likes
on
2,516 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I don't think any of this kind of stuff is listed in the Owner's Manual. These things are listed in a separate thinner booklet dedicated to Maintenance Schedules and a place for the dealerships to put their service stamps. Maybe yours is missing? If it is, they are easy to pick-up on eBay.
#8
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Brake fluid change frequency totally depends on usage. Testers are cheap. Test and it’s easy and cheap to change with a $100 investment in a pressure bleeder.
I’d still do every 2-3 years. Here’s the issue with water, it boils and evaporates which will let air into the system.
I’d still do every 2-3 years. Here’s the issue with water, it boils and evaporates which will let air into the system.
#9
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Brake fluid change frequency totally depends on usage. Testers are cheap. Test and it’s easy and cheap to change with a $100 investment in a pressure bleeder.
I’d still do every 2-3 years. Here’s the issue with water, it boils and evaporates which will let air into the system.
I’d still do every 2-3 years. Here’s the issue with water, it boils and evaporates which will let air into the system.
If one engages in regular spirit driving, track driving or similar driving it is advisable to change fluid every year. For example, I have taken readings of my fluid and ranged >1% but <2% H2O and found my brakes compromised (mushy) during heavy continuous braking. Brake fluid testers are good for information, but it all depends on the heat the system generates and the amount of H20 saturation.
The following users liked this post:
polobai (12-02-2020)
#10
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Porsche is very aggressive with their maintenance schedule especially for plugs and brake fluid flush.
if I track or drive very very hard 20 weekends per year in my 911 I understand. If you drive it like your Toyota Corolla most of the time and only so often get on it, is it needed?? You should be able to determine what is beat for you and your car.
for my Cayenne, never over 80, smooth acceleration and breaking, my maintenance schedule should be similar to a Lexus/BMW plan with plugs, brake fluid flush etc etc etc. every 4- 6 years pending the service. Extra service means $$$$$$ for dealers. I do ensure I do oil change per the warning in the dash for the Cayenne.
For my 911 I follow the Porsche schedule or even more aggressive if I track it
if I track or drive very very hard 20 weekends per year in my 911 I understand. If you drive it like your Toyota Corolla most of the time and only so often get on it, is it needed?? You should be able to determine what is beat for you and your car.
for my Cayenne, never over 80, smooth acceleration and breaking, my maintenance schedule should be similar to a Lexus/BMW plan with plugs, brake fluid flush etc etc etc. every 4- 6 years pending the service. Extra service means $$$$$$ for dealers. I do ensure I do oil change per the warning in the dash for the Cayenne.
For my 911 I follow the Porsche schedule or even more aggressive if I track it
Last edited by Norge911; 12-02-2020 at 11:38 AM.
#11
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I never understood that.
#12
Banned
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 26,141
Likes: 0
Received 5,413 Likes
on
2,516 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Originally Posted by spiderv6
True, but for some weird reason the US cars "need" service MORE than the cars in Europe. Every 2 years or 20,000 miles in Europe. Every year or 10,000 miles in the US.
I never understood that.
I never understood that.
Different fuels.
Different lawyers.
These 3 come to mind first.
The following users liked this post:
George from MD (05-29-2024)
The following users liked this post:
edirtaynine (12-02-2020)
#14
Banned
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 26,141
Likes: 0
Received 5,413 Likes
on
2,516 Posts
#15
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I'm pretty sure that brake fluid changes are recommended by nearly all vehicle manufacturers every 2 years (not by mileage).
The following users liked this post:
TwinTurbo420 (12-04-2020)