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Club Triumph forum - Cars - Herald - Master cylinder extensions
< Starting help needed Master cylinder extensions Bonnet help >
"JumpingFrog"
posts: 45
non member
 posted Mon 15th Jan 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 = 40.8mm


Extension:
  • OD of Plastic = 34.6mm
  • ID of metal collar = 44mm


Any ideas?

Thanks.

1971 Herald 13/60 Saloon - Just about on the road.
1967 Herald 1200 Estate - Having a rest - http://mongoltriumph.com
Tags - Herald Vitesse
"glang"
posts: 1126
non member
 posted Mon 15th Jan 2018 reply 1 of 5

run it without the extension but take extra care when changing pads or shoes?
Tags - Herald Vitesse
"Bitumen Boy"
posts: 271
Wye Dean group
joined on Fri 27th Apr 2012
 posted Mon 15th Jan 2018 reply 2 of 5

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.
Tags - Herald Vitesse
"JumpingFrog"
posts: 45
non member
 posted Wed 17th Jan 2018 reply 3 of 5

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.

1971 Herald 13/60 Saloon - Just about on the road.
1967 Herald 1200 Estate - Having a rest - http://mongoltriumph.com
Tags - Herald Vitesse
"glang"
posts: 1126
non member
 posted Wed 17th Jan 2018 reply 4 of 5

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
Tags - Herald Vitesse
"flying_fox"
posts: 23
Wessex (Bristol & Bath) group
joined on Fri 11th Sep 2009
 posted Wed 13th Jun 2018 reply 5 of 5

posted Sun 13th Aug 2017 reply 4 of 5

The items required are
64475476  Extension small reservoir int m/cyl
64473019  Cap/Mcyl large int Alum
378763     Seal M/cyl large int
64474602 cap Assy Reservior / large 2.96 diam
supplier
Performancebraking.com
tel 01600 713117
as at May 2016
1 of each above total cost £41.39 inc vat collected Monmouthshire
Very helpful team to mee

 
Tags - Herald Vitesse


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