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Re: Brakes drop in TR4 autocross

To: "Joe Donovan" <jdonovan@mediaone.net>, "Brian Sanborn" <sanborn@net1plus.com>, "Steven Newell" <steven@cravetechnology.com>
Subject: Re: Brakes drop in TR4 autocross
From: "Phil Ethier" <pethier@isd.net>
Date: Wed, 27 Sep 2000 00:34:20 -0500
Cc: <Triumphs@autox.team.net>
From: Joe Donovan <jdonovan@mediaone.net>


>Someone mentioned that low pedal on first application after long highway
use
>is normal.   I just noticed recently that I get a very low pedal in my TR-6
>when I first fire it up.    The pedal comes up and stays up after this.
>Is this a sign that the brakes need to be bled?


I have sort of the opposite problem.  Since I bought the TR4, the brakes
have been solid, high, and immediate.  Not the slightest hint of needing to
be pumped up, ever.  The classic "hard pedal".

I went to an autocross last Sunday.  Thought it would be fun to let my
buddies see me slide around on the brick-like tires it is currently wearing.

I launched, then made a few turns, accelerated, changed up to second.  Then
I needed to use the brakes for the first time on the run. The pedal dropped
more than half the travel.  The brakes worked fine, but it felt really weird
having such a long stroke to get to them.  Scared me half to death the first
time.

After the run, the brakes pumped right up.  Checked the reservoir.  Fluid
full, as normal.

Brakes worked normally in the marshaling lane and when I left the site for
fuel.

During every autocross run (I took eight) the pedal would drop for the
entire run and pump right up again when I finished the run.

After the event, I drove to Sherlock's Home for the weekly Sunday-evening
British-cars gathering.  Brakes were solid, high, and immediate.  Not the
slightest hint of needing to be pumped up, ever.

What the heck is this?  Could the cornering force on the these ridiculously
UN-sticky tires possibly cause the front disks to push back enough to add
all this extra brake travel?

Seems hard to believe.  Neither I nor our picky tech inspector thought the
wheel bearings were loose.

Anybody recognize these symptoms?

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/
"It makes a nice noise when it goes faster"
- 4-year-old Adam, upon seeing a bitmap of Grandma Susie's TR4.




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