<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><br>Thought this might be of interest:<div><br></div><div>While troubleshooting my 3500s brakes (Seems to have been an improperly machined relief valve in the inlet port), Bill brought up the trap valve in the Master cylinder. Not sure what it was for, I found this on an MG forum. <div><br></div><div><span style="font-family: Arial, Helvetica; font-size: 13px; -webkit-text-size-adjust: 100%; background-color: rgb(255, 255, 255);">The valve allows an initial fast drop in pressure when the pedal is released. Then at around 10-16 psi the spring pushes the valve back to it's seat so the remaining pressure bleeds down to zero more slowly. </span><br style="font-family: Arial, Helvetica; font-size: 13px; -webkit-text-size-adjust: 100%;"><br style="font-family: Arial, Helvetica; font-size: 13px; -webkit-text-size-adjust: 100%;"><span style="font-family: Arial, Helvetica; font-size: 13px; -webkit-text-size-adjust: 100%; background-color: rgb(255, 255, 255);">It is designed to prevent seal collapse which can allow air into the system. </span><br style="font-family: Arial, Helvetica; font-size: 13px; -webkit-text-size-adjust: 100%;"><br style="font-family: Arial, Helvetica; font-size: 13px; -webkit-text-size-adjust: 100%;"><span style="font-family: Arial, Helvetica; font-size: 13px; -webkit-text-size-adjust: 100%; background-color: rgb(255, 255, 255);">Originally the 68-74 brake master had valves on the front and rear ports, but for some reason, the rear one gets left out on most replacement cylinders. Probably with the thought that the original one gets re-used when the banjo fitting is changed over. </span></div><div><font face="Arial, Helvetica" size="2"><span style="-webkit-text-size-adjust: 100%; background-color: rgb(255, 255, 255);"><br></span></font></div><div><font face="Arial, Helvetica" size="2"><span style="-webkit-text-size-adjust: 100%; background-color: rgb(255, 255, 255);"><br></span></font></div><div><font face="Arial, Helvetica" size="2"><span style="-webkit-text-size-adjust: 100%; background-color: rgb(255, 255, 255);"><br></span></font></div><div><font face="Arial, Helvetica" size="2"><span style="-webkit-text-size-adjust: 100%; background-color: rgb(255, 255, 255);"><br></span></font><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Aug 1, 2020, at 2:36 PM, magnet--- via Rovernet <rovernet@rovernet.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><span>Just thought I'd pass along this info for the benefit of anyone looking for a North American source of decent quality front brake pads for the P6B.</span><br><span></span><br><span>Raybestos PGD4 These also fit Mercedes 220 and some Volvo models.</span><br><span></span><br><span>They fit perfectly and are smooth and quiet. Rock Auto do not list them under Rover, but a part number search on their site will find them. (Usual disclaimer.)</span><br><span></span><br><span>Cheers,</span><br><span></span><br><span>Bill Daddis</span><br><span></span><br><span></span><br><span></span><br><span></span><br><span>-------------- next part --------------</span><br><span>An HTML attachment was scrubbed...</span><br><span>URL: <http://rovernet.org/pipermail/rovernet_rovernet.org/attachments/20200801/1e6c6af3/attachment.html></span><br><span>_______________________________________________</span><br><span>Rovernet mailing list</span><br><span>Rovernet@rovernet.org</span><br><span>http://rovernet.org/mailman/listinfo/rovernet_rovernet.org</span><br></div></blockquote></div></div></body></html>