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Alan Dibley
Frequent User Username: alsdibley
Post Number: 405 Registered: 10-2009
| Posted on Saturday, 20 July, 2024 - 19:32: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
A firm called Bigg Red (yes, two Gs) based in Worcester makes stainless brake pistons for many British cars. Shadows use Girling type 16 components in the front brakes (a bit of research should find the corresponding rear types). These are used on lots of models of Ford in particular - 54mm diam x 29mm length. Identical pistons for different models are slightly different prices - browse the catalogue to save a few pounds. They are not expensive and must solve some of the rust/broken chrome plate problems. Other RR/Bs might benefit from stainless pistons, too. They make other brake parts - I have'nt looked at other possible upgrades. If this has already been reported here, sorry - I have not seen it. I've just fitted them to my 'T' and it seems like A Good Thing, so far. Alan D. |
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Larry Kavanagh
Frequent User Username: shadow_11
Post Number: 850 Registered: 05-2016
| Posted on Sunday, 21 July, 2024 - 00:25: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
Thanks for the info Alan. I know that Kelly Opfar at Britishtoolworks.com in the USA manufactures them too but it's good to know there's a supplier on this side of the pond. |
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Alan Dibley
Frequent User Username: alsdibley
Post Number: 406 Registered: 10-2009
| Posted on Sunday, 21 July, 2024 - 19:56: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
Larry, Kelly is a master engineer but the cost of getting the bits here spoils the economics - I would like to use his parts but .... Strange, but Bigg Red claim that they have no parts for RR/B Shadows/Ts. I have no spare rear pistons to measure, but I'm sure they are on Bigg Red list under another name - Ford???? or any other car that used Girling brakes. Anyone got some to measure? |
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Larry Kavanagh
Frequent User Username: shadow_11
Post Number: 851 Registered: 05-2016
| Posted on Sunday, 21 July, 2024 - 20:45: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
Hi Alan, I have a set of rear brake pistons from a Silver Shadow 11 that I can measure later. Just can't find my vernier measuring callipers at the moment. |
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Larry Kavanagh
Frequent User Username: shadow_11
Post Number: 852 Registered: 05-2016
| Posted on Sunday, 21 July, 2024 - 20:58: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
Silver Shadow 11 has 4 small pistons per rear calliper while earlier Silver Shadow/Bentley T with brake master cylinder had 2 small & 2 large pistons per rear calliper. |
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Larry Kavanagh
Frequent User Username: shadow_11
Post Number: 853 Registered: 05-2016
| Posted on Monday, 22 July, 2024 - 05:21: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
Hi Alan, my vernier calliper has sprouted legs but using a carpenter's measuring tape I get 29mm depth × 41mm diameter for the rear pistons in my Shadow11. |
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Alan Dibley
Frequent User Username: alsdibley
Post Number: 407 Registered: 10-2009
| Posted on Monday, 22 July, 2024 - 18:54: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
Thanks Larry. Anyone got the other size for early Shadows? |
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Jim Walters
Frequent User Username: jim_walters
Post Number: 390 Registered: 01-2014
| Posted on Wednesday, 24 July, 2024 - 03:29: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
Late Shadow rear caliper pistons are both 40.5mm, early Shadows are 40.5mm small and 48mm large. SRH8505 LRB15211 SRC18015 SRE22493 NAC-05370 www.bristolmotors.com |
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Larry Kavanagh
Frequent User Username: shadow_11
Post Number: 854 Registered: 05-2016
| Posted on Wednesday, 24 July, 2024 - 09:22: | ![Edit Post](http://au.rrforums.net/forum/icons/tree_s.gif) ![Delete Post](http://au.rrforums.net/forum/icons/delmsg.gif) ![View Post/Check IP](http://au.rrforums.net/forum/icons/checkip.gif) |
Thanks Jim for clarifying the diameter. Is the height 29mm for both large & small? |