Now supplying improved EPDM Rubber Seals for use with RR363 fluid

“Today we are going to be talking about EPDM rubber o-rings for the Rolls Royce Silver Shadow series. As everyone knows, you have to use the RR363 Brake Fluid in the Rolls-Royce Silver Shadow. It has a lubricant in it which is required because there is a lot of mechanical parts that run on it. They are not oiled, they use the hydraulic fluid as a lubricant as well as a fluid. So, we found out that some of the rubber o-rings, when they’re exposed to heat and the brake fluid, have the potential to shrink. This can cause leakage. The reason for this is because the quality of the EPDM rubber in the O rings is not as good as it used to be. That’s something that just happens over time. Manufacturers change components & in this case the EP level of the EPDM compound has been reduced and the quality has become worse for it’s purpose.

We had to outsource a new higher specification EPDM to make these kits. The main kits we are talking about today are the Valve Body kits which are part number RH2435, and the Sphere kits which are part number RH2619. The Valve Body kits come with the 3 o- rings for the Bobbin (UE34920), & the o-ring that joins the Valve Body to the Sphere  (UE35100).

It comes with a Clamping Washer for the Warning Plate on the Sphere (which is probably not going to be needed) & the little plug o-ring on the end (UE35101).

Also the Piston (RH2535) inside the barrel has 2 parts, it’s a small rubber o-ring inside with a PTFE outer seal. That’s the trickiest thing to fit. If you are going to try & fit one of these onto the Piston, you need to make a cone for it to slide up. The middle bit comes out and you do it one at a time, but that’s the most likely thing you are going to struggle with.

For the Sphere kit the Sphere obviously has to be split & a new nylon ball (GM6769941) put in the Valve and the Diaphragm (UE36704) put in between the two halves, clamped up closed and then charged with nitrogen then you put a cap on that. This seal (UE35100) is the one that goes between the Sphere and the Valve Body (Early = UE37583, Late = UE39519).

The way to know whether you have got the old type of EPDM which you can’t really trust is that we mark ours with a yellow dot. If your seal has a yellow dot then you know you have got the high quality EPDM and you are okay to use it. We have them in stock now and I suggest that if you are going to overhaul your Valve Body then only use the new high-quality EPDM seals!”