Tom:
Thanks for the information. We installed new rotors (from TRF) and disc
pads. We thought originally that the rotors were warped so we put on new
rotors.
Your suggestion about the calipers will be looked into. Thanks.
Bob Sexton
At 06:50 PM 12/8/00 -0800, you wrote:
> sounds like your front disc rotors need to be turned. i had this same
> issue on an
>american car and the problem was warped rotors. if there's no vibration
>without braking, i
>believe the issue is somewhere in the brake components. and if it's not
>the rotors, i'd
>look at the calipers and how they interact with the rotor.
> my 2 cents....
>Tom Di Iulio
>1976 TR6
>Denver, CO
>
>----- Original Message -----
>From: "Robert M. Sexton" <sexton@starmark.net>
>To: "Triumph Mailing List" <triumphs@autox.team.net>
>Sent: Friday, December 08, 2000 5:19 PM
>Subject: TR6 Occasional Pulsation/Vibration Under Braking
>
>
> >
> > My 1976 Triumph TR6 has 33,700 miles (original) on it and I have just had
> > some mechanical work done on the brakes, bushings, and stiffer springs
> > (from TRF) including new brake rotors, stainless steel brake jumpers, new
> > discs, new rear brake shoes, aluminum steering guide (from TRF), and
> > electronic ignition. Also, the rear differential mounting was reinforced
> > and cracks welded.
> >
> > I don't know whether everything is now stiffer in the suspension or what,
> > but now there is a stronger pulsation of the brake pedal and shaking when
> > normally (lightly) putting on the brakes --- sometimes. However, when
> > braking hard, the brakes work fine without any shaking of roughness of the
> > car. While driving under throttle, lightly touching the brake pedal
> > generates a pulsation. Before the repairs to the brakes and suspension,
> > only occasional shaking was noticed. The car drives and rides normally up
> > to 70mph or so (highest that I tested it today) so the general balance of
> > the wheels, tires, and suspension appear to be OK.
> >
> > The timing for this is not good since I wanted to take the TR6 for a few
> > laps around VIR (http://www.virclub.com) tomorrow (Saturday, 09dec2000).
> >
> > The mechanic (very good sports car and formula racer mechanic) thought that
> > machining the rear brake drums might help --- it did not.
> >
> > Our possible thoughts are as follows:
> >
> > 1. The front brass trunnions have slight play. Could this be the source
> > of the vibration when the car weight is distributed in certain situations
> > under light braking???
> >
> > 2. Something in the suspension or brakes???
> >
> > 3. Hydraulic brake cylinders and/or servo unit may be generating
> transients???
> >
> > Does anyone have any ideas, suggestions, or experience in this
> situation????
> >
> > Thanks for your help.
> >
> > Bob Sexton
> > sexton@starmark.net
> > 804.792.0167
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