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You should be able to judge if the callipers are apply even pressure to the
disk by the wear pattern on each side of the disk. If the wear is even and
the surfaces look very similar likely the pads are not seized. Don't rule
out air in the brake line. Are the flex hoses rubber or stainless steel
braid? You may have a flex hose that is expanding due to pressure in the
brake line.
Harold
_____
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of Bob
Spidell
Sent: Wednesday, August 05, 2020 10:00 AM
To: Michael MacLean; Austin Healey
Subject: Re: [Healeys] Brake Lockup
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
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 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? 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
>>>> _______________________________________________
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<DIV dir=3Dltr align=3Dleft><SPAN class=3D595484800-06082020><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>You should be able to judge if the callipers are =
apply even=20
pressure to the disk by the wear pattern on each side of the disk. If =
the wear=20
is even and the surfaces look very similar likely the pads are not =
seized. Don't=20
rule out air in the brake line. Are the flex hoses rubber or stainless =
steel=20
braid? You may have a flex hose that is expanding due to pressure in the =
brake=20
line.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D595484800-06082020><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D595484800-06082020><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>Harold</FONT></SPAN></DIV><BR>
<DIV lang=3Den-us class=3DOutlookMessageHeader dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT size=3D2 face=3DTahoma><B>From:</B> Healeys=20
[mailto:healeys-bounces@autox.team.net] <B>On Behalf Of </B>Bob=20
Spidell<BR><B>Sent:</B> Wednesday, August 05, 2020 10:00 =
AM<BR><B>To:</B>=20
Michael MacLean; Austin Healey<BR><B>Subject:</B> Re: [Healeys] Brake=20
Lockup<BR></FONT><BR></DIV>
<DIV></DIV>Your $0.02 is appreciated. Rotors and pads were replaced not =
too long=20
ago, but it's probably been 20 years since I rebuilt the=20
calipers.<BR><BR>Bob<BR><BR>
<DIV class=3Dmoz-cite-prefix>On 8/5/2020 9:27 AM, Michael MacLean =
wrote:<BR></DIV>
<BLOCKQUOTE cite=3Dmid:1619560074.379053.1596644855425@mail.yahoo.com=20
type=3D"cite"><DIV class=3Dyahoo-style-wrap=20
style=3D"FONT-SIZE: 16px; FONT-FAMILY: times new roman, =
new york, times, serif">
<DIV>Maybe the right caliper was fluid starved for so long that is =
froze in=20
place or at least is binding up for that reason. If all the =
brake lines=20
are clear, the only thing left is the caliper. Sounds like time =
for a=20
rebuild. Just my two cents.</DIV>
<DIV dir=3Dltr data-setdir=3D"false">Mike MacLean<BR></DIV>
<DIV id=3Dyahoo_quoted_7488643462 class=3Dyahoo_quoted>
<DIV=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: 'Helvetica Neue', Helvetica, =
Arial, sans-serif; COLOR: #26282a">
<DIV>On Tuesday, August 4, 2020, 10:07:19 PM PDT, Bob Spidell <A=20
class=3Dmoz-txt-link-rfc2396E=20
href=3D"mailto:bspidell@comcast.net";><bspidell@comcast.net></A> =
wrote:=20
</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>
<DIV dir=3Dltr>Flex lines are only a couple years old, and the hard =
lines are=20
fairly <BR clear=3Dnone>fresh cupro-nickel. You got me thinking, =
though, the RF=20
hard line may <BR clear=3Dnone>have a slight kink (they're both =
coiled). I'll=20
check it out.<BR clear=3Dnone><BR clear=3Dnone>Bob<BR clear=3Dnone>
<DIV id=3Dyqtfd45520 class=3Dyqt8894807965><BR clear=3Dnone>On =
8/4/2020 9:57 PM, <A=20
href=3D"mailto:sentenac.rw@gmail.com"; shape=3Drect =
moz-do-not-send=3D"true"=20
ymailto=3D"mailto:sentenac.rw@gmail.com";>sentenac.rw@gmail.com</A> =
wrote:<BR=20
clear=3Dnone>> Bob, could there still be some debris in the right =
front brake=20
line<BR clear=3Dnone>> that keeps the right brake from being as =
effective as=20
the left? Or an<BR clear=3Dnone>> internally frayed flex line =
to the=20
right brake?<BR clear=3Dnone>><BR clear=3Dnone>> -Roland<BR=20
clear=3Dnone>><BR clear=3Dnone>> On Tue, 4 Aug 2020 21:50:42 =
-0700, you=20
wrote:<BR clear=3Dnone>><BR clear=3Dnone>>> Thanks, Kees. The =
car's=20
brakes are stock BJ8; i.e. single circuit. It<BR clear=3Dnone>>> =
pulls=20
down straight, but locks the front left only. I replaced pads and<BR=20
clear=3Dnone>>> rotors about 4 years/20K miles ago, and the old =
gear=20
looked to be pretty<BR clear=3Dnone>>> evenly worn. The right =
rear line=20
was the one that was pinched, and I<BR clear=3Dnone>>> thought =
for sure=20
that would cure the lock-up; it did pull before I<BR =
clear=3Dnone>>>=20
replaced the line, but I don't remember the direction (pull to the =
right<BR=20
clear=3Dnone>>> would have been expected, I think).<BR=20
clear=3Dnone>>><BR clear=3Dnone>>> I'll take a look at the =
pads and=20
rotors when I get a chance.<BR clear=3Dnone>>><BR =
clear=3Dnone>>><BR=20
clear=3Dnone>>> On 8/4/2020 9:18 PM, Kees Oudesluijs wrote:<BR=20
clear=3Dnone>>>> Sounds like one of the calipers is (partly) =
seized.=20
The car is<BR clear=3Dnone>>>> probably pulling to one side =
as well=20
under normal braking. An overhaul<BR clear=3Dnone>>>> of the =
calipers=20
and new pads would probably sort it. Also check the<BR =
clear=3Dnone>>>>=20
discs.<BR clear=3Dnone>>>><BR clear=3Dnone>>>> If =
you have a=20
dual brake circuit fitted which is split in circuits<BR=20
clear=3Dnone>>>> with one front and the opposite rear brake, =
check the=20
Pressure<BR clear=3Dnone>>>> Differential Valve or Pressure=20
Differential Warning Actuator (PDWA).<BR clear=3Dnone>>>> The =
plunjer=20
should be central but can get dislodged after leakage or<BR=20
clear=3Dnone>>>> bleeding the brakes.<BR =
clear=3Dnone>>>><BR=20
clear=3Dnone>>>> But first check the tyre pressures.<BR=20
clear=3Dnone>>>><BR clear=3Dnone>>>><BR =
clear=3Dnone>>>>=20
Kees Oudesluijs<BR clear=3Dnone>>>><BR =
clear=3Dnone>>>><BR=20
clear=3Dnone>>>><BR clear=3Dnone>>>> Op 5-8-2020 om =
05:00=20
schreef Bob Spidell:<BR clear=3Dnone>>>>> Listers,<BR=20
clear=3Dnone>>>>><BR clear=3Dnone>>>>> Today I =
replaced a=20
section of brake line on my BJ8 that I'd squashed<BR=20
clear=3Dnone>>>>> with a jackstand. The operation was a =
success, and=20
I got good pedal<BR clear=3Dnone>>>>> after bleeding, but =
when I=20
stomped on the brakes only the front left<BR =
clear=3Dnone>>>>>=20
locked-up. This has been the case as long as I can remember, but as =
I<BR=20
clear=3Dnone>>>>> don't usually need to lock them up it =
hasn't=20
bothered me. But, now<BR clear=3Dnone>>>>> I'm wondering =
'why?'=20
There's no adjustment on disk brakes, obviously,<BR=20
clear=3Dnone>>>>> so why would one squeeze harder than the =
other?<BR=20
clear=3Dnone>>>>><BR clear=3Dnone>>>>> Bob<BR=20
clear=3Dnone>>>>> =
_______________________________________________<BR=20
clear=3Dnone>>>>> Support Team.Net <A=20
href=3D"http://www.team.net/donate.html"; shape=3Drect target=3D_blank=20
moz-do-not-send=3D"true">http://www.team.net/donate.html</A><BR=20
clear=3Dnone>>>>> Suggested annual donation =
$12.75<BR=20
clear=3Dnone>>>>><BR clear=3Dnone>>>>> =
Archive: <A=20
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clear=3Dnone>>>>><BR clear=3Dnone>>>>> <A=20
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ymailto=3D"mailto:Healeys@autox.team.net";>Healeys@autox.team.net</A><BR=20
clear=3Dnone>>>>> <A=20
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Unsubscribe/Manage:<BR clear=3Dnone>>>>> <A=20
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udesluijs@chello.nl</A><BR=20
clear=3Dnone>>>>><BR clear=3Dnone>>>>=20
_______________________________________________<BR =
clear=3Dnone>>>>=20
Support Team.Net <A href=3D"http://www.team.net/donate.html"; =
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