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If this was actually too much pressure in the line not being released, woul=
dn't one expect both rear brakes to be affected?
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.
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-roa=
dsters@autox.team.net>
Subject: Re: [Roadsters] Rx7 rear end issues ...edited
Check your master cylinder. The large nut on the underside of the duplex br=
ake 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 mai=
ntain about 10psi line pressure when the brakes are released. This may be c=
ausing the pads to stay in contact with the rotor.
This is something the 510 owners deal with when converting to rear disc bra=
kes. Typically they remove it or swap in one from the front disc brake circ=
uit which is 2psi.
On 510 disc brake swaps, the brake master from a 79-80? 280ZX is typically =
used as it is for 4 wheel disc brakes.
Dave Patten
Futofab LLC
Sent from my U.S.Cellular=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_d=
atsun_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 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 bearings we=
re 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 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.
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.
Parking brake assembly is (basically hanging) loose and does not appear to =
be applying pressure to the pads.
WTF am I missing?
Thanks
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);" class=3D"elementToProof">
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);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);" class=3D"elementToProof">
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);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);" class=3D"elementToProof">
tim</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> futofab <futofab@g=
sinet.net><br>
<b>Sent:</b> Wednesday, September 17, 2025 7:04 AM<br>
<b>To:</b> Tim . <tims_datsun_stuff@outlook.com>; Datsun Roadster Lis=
t <datsun-roadsters@autox.team.net><br>
<b>Subject:</b> Re: [Roadsters] Rx7 rear end issues ...edited</font>
<div> </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. </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 </div>
<div dir=3D"auto">Futofab LLC </div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto"><br>
</div>
<div id=3D"x_composer_signature" dir=3D"auto">
<div dir=3D"auto" style=3D"font-size:14px; color:#909090">Sent from my U.S.=
Cellular=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" <datsun-roadsters@auto=
x.team.net> </div>
<div>Date: 9/16/25 6:55 PM (GMT-05:00) </div>
<div>To: Datsun Roadster List <datsun-roadsters@autox.team.net>, &quo=
t;Tim ." <tims_datsun_stuff@outlook.com>
</div>
<div>Subject: Re: [Roadsters] Rx7 rear end issues ...edited </div>
<div><br>
</div>
</div>
<div id=3D"x_appendonsend"></div>
<div id=3D"x_divRplyFwdMsg">
<div style=3D"direction:ltr"> </div>
</div>
<div style=3D"direction:ltr; font-family:Calibri,Helvetica,sans-serif; font=
-size: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=
-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr; font-family:Calibri,Helvetica,sans-serif; font=
-size: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 bearings we=
re 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=
-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div class=3D"x_elementToProof" style=3D"direction:ltr; font-family:Calibri=
,Helvetica,sans-serif; font-size: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=
-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr; font-family:Calibri,Helvetica,sans-serif; font=
-size: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=
-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr; font-family:Calibri,Helvetica,sans-serif; font=
-size: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=
-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr; font-family:Calibri,Helvetica,sans-serif; font=
-size:12pt; color:rgb(0,0,0)">
WTF am I missing?</div>
<div style=3D"direction:ltr; font-family:Calibri,Helvetica,sans-serif; font=
-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style=3D"direction:ltr; font-family:Calibri,Helvetica,sans-serif; font=
-size:12pt; color:rgb(0,0,0)">
Thanks</div>
</div>
</body>
</html>
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