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Re: [Healeys] Brake Lockup

To: Michael MacLean <rrengineer.mike@att.net>, Austin Healey <healeys@autox.team.net>
Subject: Re: [Healeys] Brake Lockup
From: Bob Spidell <bspidell@comcast.net>
Date: Wed, 5 Aug 2020 09:59:49 -0700
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <597bd2b1-da31-6772-75f4-236a81b16bd6@comcast.net> <c1bc869d-d4f8-7049-f90f-c27b6dbbffb7@chello.nl> <6b2eff16-2458-d607-018d-3e9afa1ebdc0@comcast.net> <hrekifpdcf5b7f19a4uijonp245f2vcrv3@4ax.com> <1e24ac55-aea4-5910-eb76-f9b4b6547a21@comcast.net> <1619560074.379053.1596644855425@mail.yahoo.com>
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Your $0.02 is appreciated. Rotors and pads were replaced not too long 
ago, but it's probably been 20 years since I rebuilt the calipers.

Bob

On 8/5/2020 9:27 AM, Michael MacLean wrote:
> Maybe the right caliper was fluid starved for so long that is froze in 
> place or at least is binding up for that reason. If all the brake 
> lines are clear, the only thing left is the caliper.  Sounds like time 
> for a rebuild.  Just my two cents.
> Mike MacLean
> On Tuesday, August 4, 2020, 10:07:19 PM PDT, Bob Spidell 
> <bspidell@comcast.net> wrote:
>
>
> Flex lines are only a couple years old, and the hard lines are fairly
> fresh cupro-nickel. You got me thinking, though, the RF hard line may
> have a slight kink (they're both coiled). I'll check it out.
>
> Bob
>
> On 8/4/2020 9:57 PM, sentenac.rw@gmail.com 
> > Bob, could there still be some debris in the right front brake line
> > that keeps the right brake from being as effective as the left?  Or an
> > internally frayed flex line to the right brake?
> >
> > -Roland
> >
> > On Tue, 4 Aug 2020 21:50:42 -0700, you wrote:
> >
> >> Thanks, Kees. The car's brakes are stock BJ8; i.e. single circuit. It
> >> pulls down straight, but locks the front left only. I replaced pads and
> >> rotors about 4 years/20K miles ago, and the old gear looked to be 
> pretty
> >> evenly worn. The right rear line was the one that was pinched, and I
> >> thought for sure that would cure the lock-up; it did pull before I
> >> replaced the line, but I don't remember the direction (pull to the 
> right
> >> would have been expected, I think).
> >>
> >> I'll take a look at the pads and rotors when I get a chance.
> >>
> >>
> >> On 8/4/2020 9:18 PM, Kees Oudesluijs wrote:
> >>> Sounds like one of the calipers is (partly) seized. The car is
> >>> probably pulling to one side as well under normal braking. An overhaul
> >>> of the calipers and new pads would probably sort it. Also check the
> >>> discs.
> >>>
> >>> If you have a dual brake circuit fitted which is split in circuits
> >>> with one front and the opposite rear brake, check the Pressure
> >>> Differential Valve or Pressure Differential Warning Actuator (PDWA).
> >>> The plunjer should be central but can get dislodged after leakage or
> >>> bleeding the brakes.
> >>>
> >>> But first check the tyre pressures.
> >>>
> >>>
> >>> Kees Oudesluijs
> >>>
> >>>
> >>>
> >>> Op 5-8-2020 om 05:00 schreef Bob Spidell:
> >>>> Listers,
> >>>>
> >>>> Today I replaced a section of brake line on my BJ8 that I'd squashed
> >>>> with a jackstand. The operation was a success, and I got good pedal
> >>>> after bleeding, but when I stomped on the brakes only the front left
> >>>> locked-up. This has been the case as long as I can remember, but as I
> >>>> don't usually need to lock them up it hasn't bothered me. But, now
> >>>> I'm wondering 'why?' There's no adjustment on disk brakes, obviously,
> >>>> so why would one squeeze harder than the other?
> >>>>
> >>>> Bob
> >>>> _______________________________________________
> >>>> Support Team.Net http://www.team.net/donate.html
> >>>> Suggested annual donation  $12.75
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> >>>>
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> >>>>
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> >>>> http://autox.team.net/mailman/options/healeys/coudesluijs@chello.nl
> >>>>
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    Your $0.02 is appreciated. Rotors and pads were replaced not too
    long ago, but it's probably been 20 years since I rebuilt the
    calipers.<br>
    <br>
    Bob<br>
    <br>
    <div class="moz-cite-prefix">On 8/5/2020 9:27 AM, Michael MacLean
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:1619560074.379053.1596644855425@mail.yahoo.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div class="yahoo-style-wrap" style="font-family:times new roman,
        new york, times, serif;font-size:16px;">
        <div>Maybe the right caliper was fluid starved for so long that
          is froze in place or at least is binding up for that reason. 
          If all the brake lines are clear, the only thing left is the
          caliper.  Sounds like time for a rebuild.  Just my two cents.</div>
        <div dir="ltr" data-setdir="false">Mike MacLean<br>
        </div>
        <div id="yahoo_quoted_7488643462" class="yahoo_quoted">
          <div style="font-family:'Helvetica Neue', Helvetica, Arial,
            sans-serif;font-size:13px;color:#26282a;">
            <div> On Tuesday, August 4, 2020, 10:07:19 PM PDT, Bob
              Spidell <a class="moz-txt-link-rfc2396E" 
href="mailto:bspidell@comcast.net";>&lt;bspidell@comcast.net&gt;</a> wrote: 
</div>
            <div><br>
            </div>
            <div><br>
            </div>
            <div>
              <div dir="ltr">Flex lines are only a couple years old, and
                the hard lines are fairly <br clear="none">
                fresh cupro-nickel. You got me thinking, though, the RF
                hard line may <br clear="none">
                have a slight kink (they're both coiled). I'll check it
                out.<br clear="none">
                <br clear="none">
                Bob<br clear="none">
                <div class="yqt8894807965" id="yqtfd45520"><br
                    clear="none">
                  On 8/4/2020 9:57 PM, <a shape="rect"
                    ymailto="mailto:sentenac.rw@gmail.com";
                    href="mailto:sentenac.rw@gmail.com";
                    moz-do-not-send="true">sentenac.rw@gmail.com</a>
                  wrote:<br clear="none">
                  &gt; Bob, could there still be some debris in the
                  right front brake line<br clear="none">
                  &gt; that keeps the right brake from being as
                  effective as the left?  Or an<br clear="none">
                  &gt; internally frayed flex line to the right brake?<br
                    clear="none">
                  &gt;<br clear="none">
                  &gt; -Roland<br clear="none">
                  &gt;<br clear="none">
                  &gt; On Tue, 4 Aug 2020 21:50:42 -0700, you wrote:<br
                    clear="none">
                  &gt;<br clear="none">
                  &gt;&gt; Thanks, Kees. The car's brakes are stock BJ8;
                  i.e. single circuit. It<br clear="none">
                  &gt;&gt; pulls down straight, but locks the front left
                  only. I replaced pads and<br clear="none">
                  &gt;&gt; rotors about 4 years/20K miles ago, and the
                  old gear looked to be pretty<br clear="none">
                  &gt;&gt; evenly worn. The right rear line was the one
                  that was pinched, and I<br clear="none">
                  &gt;&gt; thought for sure that would cure the lock-up;
                  it did pull before I<br clear="none">
                  &gt;&gt; replaced the line, but I don't remember the
                  direction (pull to the right<br clear="none">
                  &gt;&gt; would have been expected, I think).<br
                    clear="none">
                  &gt;&gt;<br clear="none">
                  &gt;&gt; I'll take a look at the pads and rotors when
                  I get a chance.<br clear="none">
                  &gt;&gt;<br clear="none">
                  &gt;&gt;<br clear="none">
                  &gt;&gt; On 8/4/2020 9:18 PM, Kees Oudesluijs wrote:<br
                    clear="none">
                  &gt;&gt;&gt; Sounds like one of the calipers is
                  (partly) seized. The car is<br clear="none">
                  &gt;&gt;&gt; probably pulling to one side as well
                  under normal braking. An overhaul<br clear="none">
                  &gt;&gt;&gt; of the calipers and new pads would
                  probably sort it. Also check the<br clear="none">
                  &gt;&gt;&gt; discs.<br clear="none">
                  &gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt; If you have a dual brake circuit fitted
                  which is split in circuits<br clear="none">
                  &gt;&gt;&gt; with one front and the opposite rear
                  brake, check the Pressure<br clear="none">
                  &gt;&gt;&gt; Differential Valve or Pressure
                  Differential Warning Actuator (PDWA).<br clear="none">
                  &gt;&gt;&gt; The plunjer should be central but can get
                  dislodged after leakage or<br clear="none">
                  &gt;&gt;&gt; bleeding the brakes.<br clear="none">
                  &gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt; But first check the tyre pressures.<br
                    clear="none">
                  &gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt; Kees Oudesluijs<br clear="none">
                  &gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt; Op 5-8-2020 om 05:00 schreef Bob Spidell:<br
                    clear="none">
                  &gt;&gt;&gt;&gt; Listers,<br clear="none">
                  &gt;&gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt;&gt; Today I replaced a section of brake
                  line on my BJ8 that I'd squashed<br clear="none">
                  &gt;&gt;&gt;&gt; with a jackstand. The operation was a
                  success, and I got good pedal<br clear="none">
                  &gt;&gt;&gt;&gt; after bleeding, but when I stomped on
                  the brakes only the front left<br clear="none">
                  &gt;&gt;&gt;&gt; locked-up. This has been the case as
                  long as I can remember, but as I<br clear="none">
                  &gt;&gt;&gt;&gt; don't usually need to lock them up it
                  hasn't bothered me. But, now<br clear="none">
                  &gt;&gt;&gt;&gt; I'm wondering 'why?' There's no
                  adjustment on disk brakes, obviously,<br clear="none">
                  &gt;&gt;&gt;&gt; so why would one squeeze harder than
                  the other?<br clear="none">
                  &gt;&gt;&gt;&gt;<br clear="none">
                  &gt;&gt;&gt;&gt; Bob<br clear="none">
                  &gt;&gt;&gt;&gt;
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