Brake Fluid Change

[itoy]

I was talking to a certified mechanic in our area about brake fluid change. He said that brake fluid does not necessarily need to be change/flush as we do with engine oil. The original fluid should last with the car. Even hitting past 100k miles, the original brake fluid will works as designed. He said that it is just a waste of time and money to change it. What do you think about it for a Porsche? Thanks

[JFP in PA]

Originally Posted by itoy

I was talking to a certified mechanic in our area about brake fluid change. He said that brake fluid does not necessarily need to be change/flush as we do with engine oil. The original fluid should last with the car. Even hitting past 100k miles, the original brake fluid will works as designed. He said that it is just a waste of time and money to change it. What do you think about it for a Porsche? Thanks

First, you need a new mechanic; he is dead wrong as well as a “poster child” for what is wrong with the automotive repair industry. Brake fluid is hydroscopic; it absorbs water from the air and retains it, reducing the boiling point of the fluid and its ability to stop the car. The water also corrodes the Hell out of little items like your ABS/PSM system, causing thousands of dollars worth of damage.

The fluid should be flushed and changed at least every two years, more frequently if you track the car.........

[timothy]

Wrong! Brake fluid is hygroscopic meaning over time it absorbs moisture. Under heavy braking the heat buildup can boil water in the brake lines into gas bubbles. As gasses can be further compressed in the line (unlike the brake fluid) the result is loss of effective stopping power when you need it most. In a high performance car that can ruin your day.

[stephen wilson]

Can you go 100K miles? yes. should you? probably not.

I know people that have gone 200K and 10+ years without changing the brake or transmission fluid. I think 2 years a bit excessive, most manufacturers seem to recommend 3 year intervals. Porsche brake components are no different than a honda's.

My old '89 Toyota PU get's it every 10 years whether it needs it or not! No problems so far.

Track driving would make it more critical. Let your conscience be your guide!

Steve

[JFP in PA]

Originally Posted by stephen wilson

Porsche brake components are no different than a honda's.

I really wouldn't bet on that.....................

[stephen wilson]

What's so special? A caliper is a caliper, master, ABS controller, etc. They're sure to be more expensive than a "lesser" car, but many cars have brake systems and controls that are complex, with stability & traction control, etc.

Having said that, I'll flush mine every 2 years because it's still under warranty, and service records help with re-sale. I actually look for brake fluids with a high wet boiling point, more than by dry boiling point. With normal street use and change intervals, it's likely to spend more time "wet" than dry.

[paulv]

Here's an interesting article I found a while back that supports [frequent] brake fluid changes.

Regards,
paul...

[JFP in PA]

Originally Posted by stephen wilson

What's so special? A caliper is a caliper, master, ABS controller, etc. They're sure to be more expensive than a "lesser" car, but many cars have brake systems and controls that are complex, with stability & traction control, etc.

Vehicles, like the Boxster, with ABS and stability management systems are more prone to issues due the system pump, the number of valves in the control network, etc. in the PSM/PASM technology. You want to see big repair bills, screw up the hydraulic control network in the PSM. Conveniently, the replacement or removal for cleaning of any of the hydraulic pump or control valve system requires cycling the system electronically with the PIWIS computer system just to get the air out of it; hardly a “backyard” project. This is why the standard maintenance schedule for the 986/987/Cayman and other models included brake/clutch system flushes at least every two years. Astute shops actually pull fluid samples and test them rather than depending on a fixed schedule; and some cars actually need to have the fluid done more frequently due to environmental or usage related issues................

Considering how low-cost a system flush is, it also qualifies as cheap insurance……

[SeanZ4]

I did a complete brake and clutch slave flush per pedros instructions this past Saturday. It had last been done by the p-dealer I bought the car from on 2/07, almost three years. It looked brand new when I started flushing it out. I figured it probably didn't need it. When I was done... wow! what a difference in the brake pedal feel! It can still look ok and not be ok is basically what I learned. Flushing your brakes is a very easy diy. Especially if you have a bleeder machine. I'll have to say, the clutch slave was a bit of a nightmare to get to. I knew what I was getting into reading other posts. I'd rather spend a few $ on brake fluid and a Sat. afternoon doing it myself than say.... I don't know, $1k on brake work at a dealer after it's too late..... I would find a different mechanic.

sean

[mebiuspower]

Originally Posted by itoy

I was talking to a certified mechanic in our area about brake fluid change. He said that brake fluid does not necessarily need to be change/flush as we do with engine oil. The original fluid should last with the car. Even hitting past 100k miles, the original brake fluid will works as designed. He said that it is just a waste of time and money to change it. What do you think about it for a Porsche? Thanks

I hope this is not your mechanic. So... what else did he tell you about car maintenance?

[Lobo1186]

that putting a little bit of coolant in the oil helps regulate heat in hot climates.

[timothy]

Originally Posted by Lobo1186

that putting a little bit of coolant in the oil helps regulate heat in hot climates.

Really? I didn't know that. Luckily I keep a gallon of Porsche coolant at the office. Hold on, I'm going to go try it. Will let you know how it goes ...

[disclaimer: seriously people, don't do this!!!]

[itoy]

Thank you for all the comments. I really don't like to follow the mechanic's suggestion about the break fluid. I have a feeling that there is something wrong of not changing the brake fluid since it will not cost you a lot of money. besides, changing it is easy to do for DIY. I will go to AutoZone and buy me a litter of brake fluid and wait for the perfect weather to work on it. Happy New Year to all !!!!

[researchsharon]

I took my car to a dealer because the engine light was on and i needed a smog check. my mechanic was unable to diagnosis the engine problem. dealer fixed that problem, but told me i had dirty clutch fluid. He'll replace for $250.00

Is that the same as brake fluid?

Car is a 1997 with 75,000 miles. I did the 70,000 mile checkup at 53,000 in 2006 on the recommendation of my mechanic (although the mileage was low, the car was older and he felt it was necessary)

Thank you for the help.

[kabel]

^Yes. The clutch and brake system feed off the same fluid reservoir in our boxster.

[blue2000s]

They share the same reservior but if the dealer didn't bleed the brake calipers, your brakes weren't serviced. Although it's hard to believe they wouldn't do the brakes.

[sd_boxster]

Yes, your clutch and brakes use the same fluid. When you change the brake fluid, bleed the clutch as well.

*Edit* Oops. Looks like I should have clicked the "Page 2" link before adding my repetitive reply.

[LEJ]

Harbor Freight has them for $5.99

[mikesz]

I have a 99 and had the water logged booster issue. So while I was at it replacing the booster and retro kit to NOT get water logged again, I replaced the master cylinder and so had to drain the complete system. While I was at it I replaced the bleeder valves with speed bleeders from Pelican, painted my calipers, and replaced the rotors with drilled ones. I think its cheap insurance and the pedal feel is much improved.

[Timco]

Last time I used my motive bleeder, I heard a hissing noise. The tubing had a pin hole leak from age and was spraying brake fluid (very fortunately) away from the car. Watch that surgical tubing hose!!