James Bailey

The master cylinders are two part and if it "failed" how would that apply the brakes ??? What he experienced was a classic case of boiled brake fluid which when it cooled returned to a liquid state and worked just fine. And being a two piston master only 1/2 of the brakes are affected by a bad master cylinder which is WHY they exist in the first place.

Speedtoys

If you boil one line, shouldnt HALF the system still work?

James Bailey

When you are not prepared for it and you step on the pedal and it goes WAY down it feels like no brakes.....plus stopping with rear brakes alone feels like very little brake.

Mrmerlin

I think Roger sells these as well as 928INTL and there may be others,
shop around for price and quality ,
some of these are clear coated with a silicone hose stainless mesh others are bare stainless hose.

karl ruiter

I don't know why by the split brake system on the S4 does not do the job your would expect. I lost fluid in one half and had the pedal at the floor with no brakes at all.

Barry Chan

that's a bad news, good news is you are ok
Barry

Bill Ball

Steve:

When was the last time you FLUSHED (not just bled) the brake fluid?

dcrasta

Man brakes are no joke. Service the entire brake system :

I would flush (Drain and replace) the existing fluid after -

1-Servicing the Master Cylinder (flush, clean throughly, possibly rebuild or replace)
2-Service calipers -Remove, clean, inspect, replace any seals (and or pistons) that are damaged-Re-install with anti-seize and grease
3-Inspect brake lines. (replace if the budget allows with DOT approved braided lines (teflon lined)
4-Powerbleed brake system
5-Inspect and adjust parking brake.

Take you about a weekend if you work slow (like i do) . Rebuilding calipers is not 'extremely' hard just tedious.

Again, BRAKES ARE NO JOKE>
Glad no crashy for you.

Erik N

Re: SS/teflon brake lines:

Susan Thomas once told me that these are great for racing applications, where they get replaced regularly. She said they are not so great for DD applications because of teflon's lack of elasticity, because it stretches once and stays stretched which could lead to a failure.

Don't know if that's true, but I replaced mine w/ OEM lines to be safe.

dcrasta

I have used these lines on my Rx7 (88-T2) for over 6 years no problems .

http://www.corksport.com/corksport-s...rx7-32639.html

I would suggest well constructed lines similar to these.

mickster

I read that as cocksport...I figured James May had something to do with it...

Mrmerlin

At any rate a new MC could be a good thing here if its older than 15 years,
as well as the new flex lines Usually under 100.00 for all four,

and dont forget to replace the rear brake pressure unit it is usually rusty and gummed up,

a new fresh brake system will last a long time if its cared for.
Use Super Blue ATE or Gold ATE, this should keep the seals lasting as long as possible.

NOTE keep the MC dry, I made a cover for the cap so water wont drip onto the cap and get into the reservoir

whiteNSXs

Hmmm. I don't have an idea on that part, Bill. It was a wake up call and I will make sure that my mechanic gets the whole thing flushed out. I always thought I would get to the brakes one day but other issues of the car just keep cpming up. While you and everyone are here, I would go a little off topic to ask this. The car recently developed a very annoying noise. Something behind the center AC vent gives out a loud tapping sound in the frequency of 2 taps per second when I let go of the gas pedal and while the car is idling. When I step on the gas accelerating, the sound goes away. I am sure it is due to some vacuum malfunction. My AC does not blow cold air. For the longest time, only hot air came into the cabin so the heater valve was changed. Still blew hot air for a while until recently when this noise came on. One of these days, I would like to swing by Alamo for you to listen to it if you have a minute.
Steve

Mrmerlin

look up Wallys HVAC system repair at 928gt.com under tips and links on page 2 from the info provides one or more of the pods are leaking

Bill Ball

Another good guide to fixing the combo flap actuator:

http://members.rennlist.com/pirtle/svc_act.html