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Re: TR-3: Autocross, brake fade

To: "John Cowan" <jfcowan@pacbell.net>, <triumphs@autox.team.net>, <vintage-race@autox.team.net>
Subject: Re: TR-3: Autocross, brake fade
From: "Phil Ethier" <pethier@isd.net>
Date: Tue, 24 Jul 2001 20:38:46 -0500
From: John Cowan <jfcowan@pacbell.net>


>   Took the TR-3 out autocrossing for the first time and enjoyed it quite a
>lot.  The car handles much better than expected, but the brakes faded
>outrageously.  By the end of a run, the pedal was nearly to the
>floor.

No, it's not brake fade.  It is brake knock-back.  The cause is not braking.
The cause is cornering.

I had this happen when I autocrossed the TR4.  I received lots of advice.
One thing I heard this that new brake disks solved the problem.  I have not
tried that yet.

Another thing is that you can tap the brake with your left foot after you
come out of a corner so the brake pads move forward again.  I'm told that
Kas himself used to do this in race-prepared Triumphs.

Relax, I didn't believe this story at first either.  I noodled about the
symptoms and figured this was the cause, but I couldn't believe it.  When I
went public with the story, I got tons of mail telling me that's what it was
and that it was a known think with TR3 and TR4 cars.

The most amazing part is most folks told me that although the hubs spring a
bit and cause this, they don't break.

This reminds me of my buddy Brian when he autocrossed his MGB on sticky
tires.  The halfshafts bend enough that the brake drums rub the backing
plates.  Makes a heck of a scary noise.

Phil Ethier    Saint Paul  Minnesota  USA
1970 Lotus Europa, 1992 Saturn SL2, 1986 Suburban, 1962 Triumph TR4 CT2846L
LOON, MAC   pethier@isd.net     http://www.mnautox.com/
"Kids haven't lost the feeling that the sense of wonder is more important
than wondering what makes sense.  And if that doesn't define what it takes
to like British cars, I don't know what does." -Scott Fisher

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