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Re: [Healeys] Brake Lockup

To: Bob Spidell <bspidell@comcast.net>, Austin Healey <healeys@autox.team.net>
Subject: Re: [Healeys] Brake Lockup
From: Michael MacLean <rrengineer.mike@att.net>
Date: Wed, 5 Aug 2020 16:27:35 +0000 (UTC)
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> x64; rv:79.0) Gecko/20100101 Firefox/79.0
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Maybe the right caliper was fluid starved for so long that is froze in plac=
e or at least is binding up for that reason.=C2=A0 If all the brake lines a=
re clear, the only thing left is the caliper.=C2=A0 Sounds like time for a =
rebuild.=C2=A0 Just my two cents.Mike MacLean
   On Tuesday, August 4, 2020, 10:07:19 PM PDT, Bob Spidell <bspidell@comca=
st.net> wrote: =20
=20
 Flex lines are only a couple years old, and the hard lines are fairly=20
fresh cupro-nickel. You got me thinking, though, the RF hard line may=20
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 wrote:
> 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?=C2=A0 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
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>>>>
>>>> Archive: http://www.team.net/pipermail/healeys
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>>>>
>>>> Unsubscribe/Manage:
>>>> http://autox.team.net/mailman/options/healeys/coudesluijs@chello.nl
>>>>
>>> _______________________________________________
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>>>
>>> Archive: http://www.team.net/pipermail/healeys
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>>>
>> _______________________________________________
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>>
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>>
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ac.rw@gmail.com
>>

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r.mike@att.net

 =20
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<html><head></head><body><div class=3D"yahoo-style-wrap" style=3D"font-fami=
ly: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 le=
ast is binding up for that reason.&nbsp; If all the brake lines are clear, =
the only thing left is the caliper.&nbsp; Sounds like time for a rebuild.&n=
bsp; Just my two cents.</div><div dir=3D"ltr" data-setdir=3D"false">Mike Ma=
cLean<br></div><div id=3D"yahoo_quoted_7488643462" class=3D"yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Tuesday, August 4, 2020, 10:07:19 PM PDT, Bob Spidel=
l &lt;bspidell@comcast.net&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div dir=3D"ltr">Flex lines are only a couple years ol=
d, and the hard lines are fairly <br clear=3D"none">fresh cupro-nickel. You=
 got me thinking, though, the RF hard line may <br clear=3D"none">have a sl=
ight kink (they're both coiled). I'll check it out.<br clear=3D"none"><br c=
lear=3D"none">Bob<br clear=3D"none"><div class=3D"yqt8894807965" id=3D"yqtf=
d45520"><br clear=3D"none">On 8/4/2020 9:57 PM, <a shape=3D"rect" ymailto=
=3D"mailto:sentenac.rw@gmail.com"; href=3D"mailto:sentenac.rw@gmail.com";>sen=
tenac.rw@gmail.com</a> wrote:<br clear=3D"none">&gt; Bob, could there still=
 be some debris in the right front brake line<br clear=3D"none">&gt; that k=
eeps the right brake from being as effective as the left?&nbsp; Or an<br cl=
ear=3D"none">&gt; internally frayed flex line to the right brake?<br clear=
=3D"none">&gt;<br clear=3D"none">&gt; -Roland<br clear=3D"none">&gt;<br cle=
ar=3D"none">&gt; On Tue, 4 Aug 2020 21:50:42 -0700, you wrote:<br clear=3D"=
none">&gt;<br clear=3D"none">&gt;&gt; Thanks, Kees. The car's brakes are st=
ock BJ8; i.e. single circuit. It<br clear=3D"none">&gt;&gt; pulls down stra=
ight, but locks the front left only. I replaced pads and<br clear=3D"none">=
&gt;&gt; rotors about 4 years/20K miles ago, and the old gear looked to be =
pretty<br clear=3D"none">&gt;&gt; evenly worn. The right rear line was the =
one that was pinched, and I<br clear=3D"none">&gt;&gt; thought for sure tha=
t would cure the lock-up; it did pull before I<br clear=3D"none">&gt;&gt; r=
eplaced the line, but I don't remember the direction (pull to the right<br =
clear=3D"none">&gt;&gt; would have been expected, I think).<br clear=3D"non=
e">&gt;&gt;<br clear=3D"none">&gt;&gt; I'll take a look at the pads and rot=
ors when I get a chance.<br clear=3D"none">&gt;&gt;<br clear=3D"none">&gt;&=
gt;<br clear=3D"none">&gt;&gt; On 8/4/2020 9:18 PM, Kees Oudesluijs wrote:<=
br clear=3D"none">&gt;&gt;&gt; Sounds like one of the calipers is (partly) =
seized. The car is<br clear=3D"none">&gt;&gt;&gt; probably pulling to one s=
ide as well under normal braking. An overhaul<br clear=3D"none">&gt;&gt;&gt=
; of the calipers and new pads would probably sort it. Also check the<br cl=
ear=3D"none">&gt;&gt;&gt; discs.<br clear=3D"none">&gt;&gt;&gt;<br clear=3D=
"none">&gt;&gt;&gt; If you have a dual brake circuit fitted which is split =
in circuits<br clear=3D"none">&gt;&gt;&gt; with one front and the opposite =
rear brake, check the Pressure<br clear=3D"none">&gt;&gt;&gt; Differential =
Valve or Pressure Differential Warning Actuator (PDWA).<br clear=3D"none">&=
gt;&gt;&gt; The plunjer should be central but can get dislodged after leaka=
ge or<br clear=3D"none">&gt;&gt;&gt; bleeding the brakes.<br clear=3D"none"=
>&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt; But first check the tyre press=
ures.<br clear=3D"none">&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt;<br clea=
r=3D"none">&gt;&gt;&gt; Kees Oudesluijs<br clear=3D"none">&gt;&gt;&gt;<br c=
lear=3D"none">&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt;<br clear=3D"none"=
>&gt;&gt;&gt; Op 5-8-2020 om 05:00 schreef Bob Spidell:<br clear=3D"none">&=
gt;&gt;&gt;&gt; Listers,<br clear=3D"none">&gt;&gt;&gt;&gt;<br clear=3D"non=
e">&gt;&gt;&gt;&gt; Today I replaced a section of brake line on my BJ8 that=
 I'd squashed<br clear=3D"none">&gt;&gt;&gt;&gt; with a jackstand. The oper=
ation was a success, and I got good pedal<br clear=3D"none">&gt;&gt;&gt;&gt=
; after bleeding, but when I stomped on the brakes only the front left<br c=
lear=3D"none">&gt;&gt;&gt;&gt; locked-up. This has been the case as long as=
 I can remember, but as I<br clear=3D"none">&gt;&gt;&gt;&gt; don't usually =
need to lock them up it hasn't bothered me. But, now<br clear=3D"none">&gt;=
&gt;&gt;&gt; I'm wondering 'why?' There's no adjustment on disk brakes, obv=
iously,<br clear=3D"none">&gt;&gt;&gt;&gt; so why would one squeeze harder =
than the other?<br clear=3D"none">&gt;&gt;&gt;&gt;<br clear=3D"none">&gt;&g=
t;&gt;&gt; Bob<br clear=3D"none">&gt;&gt;&gt;&gt; _________________________=
______________________<br clear=3D"none">&gt;&gt;&gt;&gt; Support Team.Net =
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