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The rear-brake question opens more questions. MGBs had rear cyli=
nders to fit the Tourers and the GTs, different sizes of cylinders and diffe=
rent back plates. The roll pins located the cylinders in the correct back=
ing plates.
Thus the questions arise: Tourer back plates and new GT cylinders?=
GT backplates and new Tourer cylinders? Car modified before you got it? W=
rong cylinders ordered/shipped?
Having wrestled through this with my GT, it was years back and now I=
do not recall which cylinders (size and pin location) are Tourer or GT. So=
meone will know, though, and that challenge easily mastered. GT cylinders a=
re larger, suited to the additional weight of GTs. If you have to swap part=
s, do it the way MG built it=E2=80=94they got it right.=20
As you replaced them years ago, my bet is that the vendor shipped w=
rong cylinders.=20
As to the bleeding, my experience has been that ordinary pedal push=
ing has done fine for me on many cars, though I did install speed bleeders o=
n this GT. They are an easy exchange and work OK, but the savings of 1/4 cu=
p of brake fluid doing the job are hardly worthwhile. If the rear brakes a=
re difficult to bleed, have a close look at the metal pipes on the axle. A c=
ar that has been flat-bed carried may have had the straps wrapped around the=
axle, crushing the tubes. That=E2=80=99s not an unusual thing to find.
Since you are changing hoses, have you changed clutch hose? These b=
reak down internally whilst appearing fine externally. As you do the change,=
do it swiftly, w/o interruption, as introducing a bubble into the line is a=
ltogether too easy, and bleeding the clutch line has made many an owner irat=
e.
Bob
> On Oct 23, 2021, at 1:04 PM, wkilleffer@epbfi.com wrote:
>=20
> Hello everyone,
>=20
> The car I'm working on is a 1974 MGB roadster. I decided that I wanted to r=
eplace everything relating to the brakes and their hydraulics except for the=
metal lines. I ordered the parts from Moss but had to sit on them for a cou=
ple of years before actually starting the project.
>=20
> So, I got the new master cylinder installed, which is probably one of the m=
ore challenging things I've ever done on the car. Next step was working on t=
he rear brakes. The rubber hose in the back was pretty simple, but the issue=
is with the wheel cylinders. I replaced them maybe twenty years ago and did=
n't have any trouble. But these new ones have a roller pin on them that does=
n't line up with the holes on the brake's backing plate. It's been too long t=
o try and swap them with Moss, and I'm not sure that would do any good anywa=
y because I don't recall that there were too many choices for that part. You=
could get a cheaper aftermarket or a more expensive part that may be made i=
n England. I went with the cheaper one.
>=20
> Has this been an issue for anyone else? I could probably drill another hol=
e in the back plate to match the roll pin, but that seems like one of those D=
PO solutions. Also, I don't feel like I should have to entertain such a noti=
on anyway. The part should fit and function correctly. The current wheel cyl=
inders are probably ok to re-use, but I liked the idea of all new parts. The=
front brakes are also on the agenda, but we're not there yet.
>=20
> The next question has to do with bleeding the rear brakes. I started to bl=
eed the brake furthest from the MC using a vacuum tool I got at a well-known=
less expensive (think shipping at a port) tool store. It's been a letdown f=
or several reasons, among them that the bleeders on the wheel cylinders seem=
too small for the bleeder fittings that came with the tool, which causes th=
e tool to draw a great deal of air through its system. I seemed to barely be=
able to get any fluid through the system. The trouble I have is that I am s=
ingle and live alone, so I don't have any readily available sources of help.=
If the brakes are going to be bled, I have to do them by myself. Does anyon=
e have any advice on this topic?
>=20
> Thank you,
> -William
> 1974 MGB
> _______________________________________________
>=20
> Mgs@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.75
>=20
> Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
>=20
> Unsubscribe: http://autox.team.net/mailman/options/mgs/mgbobh@gmail.com
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr"><sp=
an class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>The rear-bra=
ke question opens more questions. MGBs had rear cylinders to fi=
t the Tourers and the GTs, different sizes of cylinders and different back p=
lates. The roll pins located the cylinders in the correct backi=
ng plates.</div><div dir=3D"ltr"><span class=3D"Apple-tab-span" style=3D"whi=
te-space:pre"> </span>Thus the questions arise: Tourer back plates a=
nd new GT cylinders? GT backplates and new Tourer cylinders? Car modif=
ied before you got it? Wrong cylinders ordered/shipped?</div><div dir=3D=
"ltr"><span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>Havi=
ng wrestled through this with my GT, it was years back and now I do not reca=
ll which cylinders (size and pin location) are Tourer or GT. Someone w=
ill know, though, and that challenge easily mastered. GT cylinders ar=
e larger, suited to the additional weight of GTs. If you have to swap p=
arts, do it the way MG built it=E2=80=94they got it right. </div><div d=
ir=3D"ltr"><span class=3D"Apple-tab-span" style=3D"white-space:pre"> </s=
pan>As you replaced them years ago, my bet is that the vendor shipped wrong c=
ylinders. </div><div dir=3D"ltr"><span class=3D"Apple-tab-span" style=3D=
"white-space:pre"> </span>As to the bleeding, my experience has been t=
hat ordinary pedal pushing has done fine for me on many cars, though I did i=
nstall speed bleeders on this GT. They are an easy exchange and work O=
K, but the savings of 1/4 cup of brake fluid doing the job are hardly worthw=
hile. If the rear brakes are difficult to bleed, have a close look at=
the metal pipes on the axle. A car that has been flat-bed carried may=
have had the straps wrapped around the axle, crushing the tubes. That=
=E2=80=99s not an unusual thing to find.</div><div dir=3D"ltr"><span class=3D=
"Apple-tab-span" style=3D"white-space:pre"> </span>Since you are changi=
ng hoses, have you changed clutch hose? These break down internally wh=
ilst appearing fine externally. As you do the change, do it swiftly, w/o int=
erruption, as introducing a bubble into the line is altogether too easy, and=
bleeding the clutch line has made many an owner irate.</div><div dir=3D"ltr=
">Bob</div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br>On Oct 23, 2021, a=
t 1:04 PM, <a href=3D"mailto:wkilleffer@epbfi.com";>wkilleffer@epbfi.com</a> w=
rote:<br><br></div><blockquote type=3D"cite"><div dir=3D"ltr"><div style=3D"=
font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000">=
<div>Hello everyone,</div><div><br data-mce-bogus=3D"1"></div><div>The car I=
'm working on is a 1974 MGB roadster. I decided that I wanted to replace eve=
rything relating to the brakes and their hydraulics except for the metal lin=
es. I ordered the parts from Moss but had to sit on them for a couple of yea=
rs before actually starting the project.</div><div><br data-mce-bogus=3D"1">=
</div><div>So, I got the new master cylinder installed, which is probably on=
e of the more challenging things I've ever done on the car. Next step was wo=
rking on the rear brakes. The rubber hose in the back was pretty simple, but=
the issue is with the wheel cylinders. I replaced them maybe twenty years a=
go and didn't have any trouble. But these new ones have a roller pin on them=
that doesn't line up with the holes on the brake's backing plate. It's been=
too long to try and swap them with Moss, and I'm not sure that would do any=
good anyway because I don't recall that there were too many choices for tha=
t part. You could get a cheaper aftermarket or a more expensive part that ma=
y be made in England. I went with the cheaper one.</div><div><br data-mce-bo=
gus=3D"1"></div><div>Has this been an issue for anyone else? I could probabl=
y drill another hole in the back plate to match the roll pin, but that seems=
like one of those DPO solutions. Also, I don't feel like I should have to e=
ntertain such a notion anyway. The part should fit and function correctly. T=
he current wheel cylinders are probably ok to re-use, but I liked the idea o=
f all new parts. The front brakes are also on the agenda, but we're not ther=
e yet.</div><div><br data-mce-bogus=3D"1"></div><div>The next question has t=
o do with bleeding the rear brakes. I started to bleed the brake furthest fr=
om the MC using a vacuum tool I got at a well-known less expensive (think sh=
ipping at a port) tool store. It's been a letdown for several reasons, among=
them that the bleeders on the wheel cylinders seem too small for the bleede=
r fittings that came with the tool, which causes the tool to draw a great de=
al of air through its system. I seemed to barely be able to get any fluid th=
rough the system. The trouble I have is that I am single and live alone, so I=
don't have any readily available sources of help. If the brakes are going t=
o be bled, I have to do them by myself. Does anyone have any advice on this t=
opic?</div><div><br data-mce-bogus=3D"1"></div><div>Thank you,</div><div>-Wi=
lliam</div><div>1974 MGB</div></div></div></blockquote><blockquote type=3D"c=
ite"><div dir=3D"ltr"><span>_______________________________________________<=
/span><br><span></span><br><span><a href=3D"mailto:Mgs@autox.team.net";>Mgs@a=
utox.team.net</a></span><br><span>Donate: <a href=3D"http://www.team.net/don=
ate.html">http://www.team.net/donate.html</a></span><br><span>Suggested annu=
al donation $12.75</span><br><span></span><br><span>Archive: <a href=3D=
"http://www.team.net/pipermail/mgs";>http://www.team.net/pipermail/mgs</a> <a=
href=3D"http://autox.team.net/archive";>http://autox.team.net/archive</a></s=
pan><br><span></span><br><span>Unsubscribe: <a href=3D"http://autox.team.net=
/mailman/options/mgs/mgbobh@gmail.com">http://autox.team.net/mailman/options=
/mgs/mgbobh@gmail.com</a></span><br></div></blockquote></body></html>=
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