[200q20v] Brake fade and lockup help

Kneale Brownson knotnook at traverse.com
Sat Jul 21 20:57:15 EDT 2001

Folks who've described similar high-temp situations and front brake lock-up 
have reported the fix was a new brake master cylinder.  Someone on the 
various Q-lists (I'm addicted to three) suggested recently that the alloy 
MC warps with engine compartment heat and the piston inside can't retract 
like it should to release hydraulic pressure on the calipers.  A test might 
be to carry a water bottle, and the next time you encounter this behavior, 
try spraying the MC with the water.  If it begins to work again, you've 
diagnosed the trouble.

At 07:32 PM 07/21/2001 -0400, Chewy4000 at aol.com wrote:

>Today I took a ryde to queens from my home in Newark NJ.
>Once in th city, crossing China town gradually my brakes seem to loose 
>pressure on the pedal and the car also seemd have to front rotors frozon 
>or locked up.
>It got to a point that if I just touched th brk pedal the car would slam 
>on the braked, just like I was riding the brakes.
>I had to stop and let the smoking rotors cool down to continue.
>Once the the fast moving highway no problem but as soon as I hit traffic 
>in 90f temp little by little I loose pedal and the front brakes lock up
>Any I deal that could help in tomorows problem search
>Raul Inguanzo
>Newark NJ91 200 20v 175mi
>200q20v mailing list
>200q20v at audifans.com

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