JumpingFrog Posted January 15, 2018 Share Posted January 15, 2018 I bought a pair of TRW master cylinders (GMC205, = PNB454?) around a year ago, for a Herald with disc brakes. But I've only just got round to actually fitting them... I also bought a reproduction extension piece. Put these away without thinking, but it turns out the extension doesn't fit. It fits the original (beyond rebuilding) master cylinders, but not the new ones.TRW: ID = 32.5mm OD = 40.8mmExtension: OD of Plastic = 34.6mm ID of metal collar = 44mmAny ideas?Thanks. Quote Link to comment Share on other sites More sharing options...
glang Posted January 15, 2018 Share Posted January 15, 2018 run it without the extension but take extra care when changing pads or shoes? Quote Link to comment Share on other sites More sharing options...
Bitumen Boy Posted January 15, 2018 Share Posted January 15, 2018 Quoted from glang run it without the extension but take extra care when changing pads or shoes? Which I've been doing for years without problems. Keep an eye on the fluid level - hardly onerous on these cars - while checking oil etc, and simply remove some from the reservoir when changing linings. I use some clean tissue paper to soak it up before dumping it in a suitable handy container, place plenty of rags in the vicinity to protect paintwork from any drips and there's no problem. Quote Link to comment Share on other sites More sharing options...
JumpingFrog Posted January 17, 2018 Author Share Posted January 17, 2018 Thanks for the replies, being mindful of the fluid level seems a reasonable solution. Doesn't really make sense to me why TRW decided to change the dimensions, even the unbranded ones retain the original dimensions.However, to give me one less thing to worry about, I'll probably change the M/C for an external reservoir type (e.g. https://www.demon-tweeks.co.uk.....loy-master-cylinders), and then mount an external reservoir on the bulkhead. Personally, I prefer a translucent reservoir, particularly for the brakes. Quote Link to comment Share on other sites More sharing options...
glang Posted January 17, 2018 Share Posted January 17, 2018 If youre going to fit one like that why not also buy the large reservoir that screws directly into it? Then you wont have to worry about mounting a remote reservoir but will have sufficient capacity for pad/shoes changes without risk of spillage What about this item: http://www.jamespaddock.co.uk/brake-master-cylinder-single-line-2 Quote Link to comment Share on other sites More sharing options...
flying_fox Posted June 13, 2018 Share Posted June 13, 2018 posted Sun 13th Aug 2017 reply 4 of 5 The items required are 64475476 Extension small reservoir int m/cyl64473019 Cap/Mcyl large int Alum378763 Seal M/cyl large int64474602 cap Assy Reservior / large 2.96 diamsupplierPerformancebraking.comtel 01600 713117as at May 2016 1 of each above total cost £41.39 inc vat collected MonmouthshireVery helpful team to mee Quote Link to comment Share on other sites More sharing options...
.thumb.jpeg.b15b81ef10abeea1c3039ae03c4a9f3a.jpeg)
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.