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RE: TR3A restrictor valve question

To: "Triumph List" <triumphs@autox.team.net>
Subject: RE: TR3A restrictor valve question
From: "Randall Young" <ryoung@navcomtech.com>
Date: Fri, 4 Apr 2003 17:44:30 -0800 FILETIME=[E6E88130:01C2FB14]
> I get the feeling that my car (TR3A) doesn't roll as freely as it
> should and
> I suspect the restrictor valve in the brake line isn't letting go
> enough. Do
> I remember correctly that I can remove the innards of this valve with
> minimal impact on breaking abilities?

As with any modification to a safety-critical system like brakes, you're
taking a chance.  Triumph-Standard had a valid reason for adding the
restrictor valve.

That said, the worst that can happen without it is that the brake pedal may
be lower than usual after some spirited driving.  I took the innards out of
my valve almost 20 years ago, and I've never had to pump the pedal to get
brakes (for this reason anyway <g>).  But, it could happen.

It's my belief that the valve is supposed to add a detectable amount of
rolling resistance, but I can't prove that offhand.  ISTR reading it was
supposed to hold 4 psi, which would translate to about 12 lbf at the pads.
On my car, it was enough to hold it on a very slight grade, but the effect
would lessen as you drove without using the brakes.  But I've no idea if it
was working properly or not, I just know that I like it gone!

Randall

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