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> Brake Fade?, Thought I was dead
Trevorg7
post Aug 5 2005, 09:13 AM
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Nothing like your brake peddle hitting the floor while exiting the freeway at 65 to get your heart started in the morning.

So, north bound 280 exiting to 92 and my brake peddle hits the floor (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) !

I manage not to hit anyone and coast to a surface street. After limping down the street a bit, 10 mins, the brake peddle came back and I was able to stop again.

Was this brake fade? Seems unsafe to drive home but????

I've done all brakes in the past three months and bleed the brakes. Could it have been just a bubble I missed or pure brake fade?

Thoughts?

Thanks

T
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Trekkor
post Aug 5 2005, 10:43 AM
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I had true brake fade at Streets of Willow during our WCC track day.

Conditions: Fast driving ( 65-100 mph ) and HARD braking every 10-20 seconds for 10-12 minutes straight.

Add to this older stock brake pads and very old, water contaminated brake fluid.

The older pads means harder, longer brake application. More heat.
When the calipers get boiling hot after about 9 minutes the water in the brake fluid starts to boil and vaporize creating bubbles ( liquid turning into a gas ) in the system.

The pedal gets softer and softer until you have no brakes. Not fun.

As soon as I detected ANY loss of braking power, I went back to the pits, right away.

Bleeding the brakes ( purging the air out of the calipers ) gives you brakes, but only until they heat up again.

A few of us experienced this.

Solution is to flush the old fluid out at regular intervals, not waiting for symtoms of fade.
My SS lines and race pads didn't hurt either. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)

KT
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Posts in this topic
Trevorg7   Brake Fade?   Aug 5 2005, 09:13 AM
VegasRacer   'Brake Fade' occurs from heat buildup due ...   Aug 5 2005, 09:20 AM
Trevorg7   Good point. I was a freeway speed for 30 mins with...   Aug 5 2005, 09:28 AM
Mueller   bad mastercylinder?? any leaks @ the fittings? I...   Aug 5 2005, 09:28 AM
goose2   sounds like a master cylinder problem to me   Aug 5 2005, 09:35 AM
mihai914   Also add a sticking piston or rear brake pads too ...   Aug 5 2005, 09:36 AM
Trevorg7   Great feedback guys....so.....questions... would ...   Aug 5 2005, 09:43 AM
seanery   a dragging caliper would most likely cause a pulli...   Aug 5 2005, 09:47 AM
Porsche Rescue   I don't think "fade" applies at all to your ex...   Aug 5 2005, 10:11 AM
goose2   If a piston is sticking, you will feel it when coa...   Aug 5 2005, 10:12 AM
bondo   I'd say if you can't find anything wrong, ...   Aug 5 2005, 10:22 AM
ArtechnikA   <...   Aug 5 2005, 10:31 AM
!   Most likely the MC, also I would consider that in ...   Aug 5 2005, 10:38 AM
URY914   BTW, a MC change is a PITA. http://...   Aug 5 2005, 10:39 AM
Dr. Roger   You did not mention weather nor not you could reco...   Aug 5 2005, 10:41 AM
trekkor   I had true brake fade at Streets of Willow during ...   Aug 5 2005, 10:43 AM
Rough_Rider   Check your lug nust, Seriously.... If any are loos...   Aug 5 2005, 10:46 AM
Trevorg7   Thank you all for the info. To answer more questi...   Aug 5 2005, 12:16 PM
Travis Neff   I had a sticky front caliper and there was just th...   Aug 5 2005, 01:29 PM
trekkor   HPH is where many of us take our cars if we do not...   Aug 5 2005, 01:37 PM
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