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Boost Freak
 
Maxx1's Avatar
 
Join Date: Jun 2007
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Arrow How often do you change your brake fluid?

I heard you are supposed to purge it every year on a Porsche. I was also told to stay away from the silicone based fluid (doesn't mix with Dot3/4).

So Dot 4 every year, does that sound right? I'm a year overdue!

What I wonder is, why every year on a Porsche, yet a Chevy, Toyota or Honda goes about 10 years before you even think about something like that?
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82 Porsche 930 Euro, black, 31K miles.
Factory stock other than k27 turbo, B&B headers, GHL exhaust, Tial F40, 1 bar wastegate, MSD 6A ignition, 8" and 9" Fuch upgrade, H4 Xenon headlamps and a 930S steering wheel.
Old 02-10-2010, 06:31 PM
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My 2006 Mini Cooper S calls for new brake fluid every 2 years in the maintenance guide.

People may go for 10 years without thinking about it, but that doesn't mean they are following the recommended maintenance schedule.

The fluid in my car has been changed recently (in terms of mileage), but I changed it last summer anyway. I put on stainless lines, so the system needed bleeding anyway. Plus, it was just before last summer's Turbopalooza and the car was going to be on track. I had no brake fade issues and it was almost 100 degrees out on the trackday.
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Old 02-10-2010, 07:36 PM
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All manufacturers recommend 1 to 2 years max. as the fluid absorbs water from the air. Since these are high performance cars when you need your brakes you may really need them so once a year is probably a better idea for most. And BTW there is a vent line to the reservoir vs. the cap on most cars, which I have always thought was worse for moisture getting in?

Correct on the fluid.
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Old 02-10-2010, 08:19 PM
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I'd say flushing the brake fluid is probably thee most overlooked maintenance item. I do all my cars every 2 years.
Old 02-11-2010, 12:33 AM
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I don't know of anyone who does this on schedule. I've also never seen a car/truck come back from a dealer or brake shop after having its fluid replaced and there be any sign of the fluid actually being replaced.

I probably do it every 2 to 3 years unless I'm going to the track and then I change it if it's been more than 6 months.
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Old 02-11-2010, 05:33 AM
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Turbo Hooligan
 
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I usually do it at the track after the first session when I make it 2 laps and have serious brake fade and finally come to realize that I really should've changed the fluid as part of track prep. cant teach an old dog new tricks, and besides, what fun is flushing out brake fluid if its not sweltering hot outside, your cars not sweltering hot from just coming off the track, and you don't leave any skin on the calipers and discs???

or I'm an idiot.
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Old 02-11-2010, 05:45 AM
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I'm bad....I mean REALLY bad...at remembering to do this at any frequency. And guess what, all my brakes continue to brake...so give me a break.

That said, my 930 is due for a flush. My 3000GT, however, was waaaaayyyyyyy past due to the point where last month I noticed the pedal going to the floor with barely enough hydraulic pressure to disengage things. Turns out I couldn't even see any fluid in the reservoir (oh oh, leaking out somewhere?). Never found a leak or any sign of one, and simply flushed the thing out with new stuff and all is well. I've had the car for 14 years and....ummm...gulp....never flushed or changed the fluid. I think it evaporated away over time.

Shame on me, I'm hanging my head here!
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Old 02-11-2010, 10:15 AM
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Quote:
Originally Posted by 125shifter View Post
I've also never seen a car/truck come back from a dealer or brake shop after having its fluid replaced and there be any sign of the fluid actually being replaced.
Thats because 99.9% of the dealers/shops out there just charge you for it, but they dont perform the service. I used to work at a Benz dealer a while back and needless to say I quit after a very short while. It wasnt about repairing cars, it was about ripping people off.
Old 02-11-2010, 12:05 PM
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For the 930, it's bled before every track event while I check the rotors and pads. Cheap insurance for good brakes.

For my truck? That's a different story. I just bled them for the first time in 9 years. It was nasty.
Old 02-11-2010, 01:17 PM
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I was thinking it's good insurance against developing corrosion on the aluminum wheel cylinder pistons and such

I think I'll make that the first thing I do this spring when I get the car back out. I noticed my Acura brakes getting slightly spongy this past year .... I've never changed it and it's been 7 years now!
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82 Porsche 930 Euro, black, 31K miles.
Factory stock other than k27 turbo, B&B headers, GHL exhaust, Tial F40, 1 bar wastegate, MSD 6A ignition, 8" and 9" Fuch upgrade, H4 Xenon headlamps and a 930S steering wheel.
Old 02-11-2010, 03:27 PM
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I'd say every two years depending on the track/hard driving use. But, I really look at the fluid color change puting a flash light behind the resevoir... and depending on ther turbidity go from there - old fashion way!
Old 02-13-2010, 07:08 AM
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