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Also check the rubber brake hose going to the wheel. Take the hose off and
blow through it both ways. I had a hose that delaminated inside,
effectively turning it into a one way valve.
On Tue, Sep 23, 2025, 7:26=E2=80=AFAM Tim . via Datsun-roadsters <
datsun-roadsters@autox.team.net> wrote:
> If this was actually too much pressure in the line not being released,
> wouldn't one expect both rear brakes to be affected?
>
> In my case, only the RR is rubbing. Also, I ran the caliper piston all th=
e
> way back in and have not touched the brake pedal at all.
>
> tim
> ------------------------------
> *From:* futofab <futofab@gsinet.net>
> *Sent:* Wednesday, September 17, 2025 7:04 AM
> *To:* Tim . <tims_datsun_stuff@outlook.com>; Datsun Roadster List <
> datsun-roadsters@autox.team.net>
> *Subject:* Re: [Roadsters] Rx7 rear end issues ...edited
>
> Check your master cylinder. The large nut on the underside of the duplex
> brake master, where the brake line attaches, houses a pressure releif
> valve.
>
> If you have a pressure relief valve for the drum rear brakes, they will
> maintain about 10psi line pressure when the brakes are released. This may
> be causing the pads to stay in contact with the rotor.
>
> This is something the 510 owners deal with when converting to rear disc
> brakes. Typically they remove it or swap in one from the front disc brake
> circuit which is 2psi.
>
> On 510 disc brake swaps, the brake master from a 79-80? 280ZX is typicall=
y
> used as it is for 4 wheel disc brakes.
>
> Dave Patten
> Futofab LLC
>
>
>
> Sent from my U.S.Cellular=C2=A9 Smartphone
>
>
> -------- Original message --------
> From: "Tim . via Datsun-roadsters" <datsun-roadsters@autox.team.net>
> Date: 9/16/25 6:55 PM (GMT-05:00)
> To: Datsun Roadster List <datsun-roadsters@autox.team.net>, "Tim ." <
> tims_datsun_stuff@outlook.com>
> Subject: Re: [Roadsters] Rx7 rear end issues ...edited
>
>
> I believe I have the rear end from an 82-83 Rx7 with disc brakes and LSD.
>
> I re-built my drive shaft and got rid of the noise I heard with no wheels
> or brakes mounted (and the car running in gear). Third member bearings an=
d
> axle bearings spin nice and smooth. I've been told that the axle bearings
> were replaced by the person who customized this rear end for the Roadster=
.
>
> With the car on jack stands, I re-assembled the brakes, hung the wheels
> and ran the car (still on jack stands). I immediately heard a rubbing noi=
se
> coming from the RR. The noise went away at higher RPMs but there was stil=
l
> something rubbing that caused the rotor to get so hot I could smell it.
>
> Pulled the wheel back off. Brake pads have a little play as does the part
> of the assembly that holds the piston. Nothing appears to be binding and
> nothing is sloppy loose.
>
> Parking brake assembly is (basically hanging) loose and does not appear t=
o
> be applying pressure to the pads.
>
> WTF am I missing?
>
> Thanks
> ________________________________________
>
> datsun-roadsters@autox.team.net
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/datsun-roadsters
> http://autox.team.net/archive
>
> Unsubscribe:
> http://autox.team.net/mailman/options/datsun-roadsters/redroadsterman@gma=
il.com
>
>
>
--000000000000cd56f4063f76ac81
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<div dir=3D"auto">Also check the rubber brake hose going to the wheel. Take=
the hose off and blow through it both ways. I had a hose that delaminated =
inside, effectively turning it into a one way valve.</div><br><div class=3D=
"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">O=
n Tue, Sep 23, 2025, 7:26=E2=80=AFAM Tim . via Datsun-roadsters <<a href=
=3D"mailto:datsun-roadsters@autox.team.net";>datsun-roadsters@autox.team.net=
</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir=3D"ltr">
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
If this was actually too much pressure in the line not being released, woul=
dn't one expect both rear brakes to be affected?</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
<br>
</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
In my case, only the RR is rubbing. Also, I ran the caliper piston all the =
way back in and have not touched the brake pedal at all.</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
<br>
</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
tim</div>
<div id=3D"m_-6037608654467475522appendonsend"></div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_-6037608654467475522divRplyFwdMsg" dir=3D"ltr"><font face=3D"C=
alibri, sans-serif" style=3D"font-size:11pt" color=3D"#000000"><b>From:</b>=
futofab <<a href=3D"mailto:futofab@gsinet.net"; target=3D"_blank" rel=3D=
"noreferrer">futofab@gsinet.net</a>><br>
<b>Sent:</b> Wednesday, September 17, 2025 7:04 AM<br>
<b>To:</b> Tim . <<a href=3D"mailto:tims_datsun_stuff@outlook.com"; targe=
t=3D"_blank" rel=3D"noreferrer">tims_datsun_stuff@outlook.com</a>>; Dats=
un Roadster List <<a href=3D"mailto:datsun-roadsters@autox.team.net"; tar=
get=3D"_blank" rel=3D"noreferrer">datsun-roadsters@autox.team.net</a>><b=
r>
<b>Subject:</b> Re: [Roadsters] Rx7 rear end issues ...edited</font>
<div>=C2=A0</div>
</div>
<div dir=3D"auto">
<div dir=3D"auto">Check your master cylinder. The large nut on the undersid=
e of the duplex brake master, where the brake line attaches, houses a press=
ure releif valve.=C2=A0</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">If you have a pressure relief valve for the drum rear bra=
kes, they will maintain about 10psi line pressure when the brakes are relea=
sed. This may be causing the pads to stay in contact with the rotor.</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">This is something the 510 owners deal with when convertin=
g to rear disc brakes. Typically they remove it or swap in one from the fro=
nt disc brake circuit which is 2psi.</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">On 510 disc brake swaps, the brake master from a 79-80? 2=
80ZX is typically used as it is for 4 wheel disc brakes.</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">Dave Patten=C2=A0</div>
<div dir=3D"auto">Futofab LLC=C2=A0</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto"><br>
</div>
<div id=3D"m_-6037608654467475522x_composer_signature" dir=3D"auto">
<div dir=3D"auto" style=3D"font-size:14px;color:#909090">Sent from my U.S.C=
ellular=C2=A9 Smartphone</div>
</div>
<div dir=3D"auto"><br>
</div>
<div><br>
</div>
<div align=3D"left" dir=3D"auto" style=3D"font-size:100%;color:#000000">
<div>-------- Original message --------</div>
<div>From: "Tim . via Datsun-roadsters" <<a href=3D"mailto:dat=
sun-roadsters@autox.team.net" target=3D"_blank" rel=3D"noreferrer">datsun-r=
oadsters@autox.team.net</a>> </div>
<div>Date: 9/16/25 6:55 PM (GMT-05:00) </div>
<div>To: Datsun Roadster List <<a href=3D"mailto:datsun-roadsters@autox.=
team.net" target=3D"_blank" rel=3D"noreferrer">datsun-roadsters@autox.team.=
net</a>>, "Tim ." <<a href=3D"mailto:tims_datsun_stuff@outl=
ook.com" target=3D"_blank" rel=3D"noreferrer">tims_datsun_stuff@outlook.com=
</a>>
</div>
<div>Subject: Re: [Roadsters] Rx7 rear end issues ...edited </div>
<div><br>
</div>
</div>
<div id=3D"m_-6037608654467475522x_appendonsend"></div>
<div id=3D"m_-6037608654467475522x_divRplyFwdMsg">
<div style=3D"direction:ltr">=C2=A0</div>
</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
I believe I have the rear end from an 82-83 Rx7 with disc brakes and LSD.</=
div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
I re-built my drive shaft and got rid of the noise I heard with no wheels o=
r brakes mounted (and the car running in gear). Third member bearings and a=
xle bearings spin nice and smooth. I've been told that the axle bearing=
s were replaced by the person who customized
this rear end for the Roadster.</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
With the car on jack stands, I re-assembled the brakes, hung the wheels and=
ran the car (still on jack stands). I immediately heard a rubbing noise co=
ming from the RR. The noise went away at higher RPMs but there was still so=
mething rubbing that caused the
rotor to get so hot I could smell it.</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
Pulled the wheel back off. Brake pads have a little play as does the part o=
f the assembly that holds the piston. Nothing appears to be binding and not=
hing is sloppy loose.</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
Parking brake assembly is (basically hanging) loose and does not appear to =
be applying pressure to the pads.</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
WTF am I missing?</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr;font-family:Calibri,Helvetica,sans-serif;font-s=
ize:12pt;color:rgb(0,0,0)">
Thanks</div>
</div>
</div>
________________________________________<br>
<br>
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"noreferrer">datsun-roadsters@autox.team.net</a><br>
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<br>
</blockquote></div>
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