scotty71 Posted January 24, 2018 Share Posted January 24, 2018 To improve the braking for the herald 1360, would it be a good idea to use the 1500 spitfire brakesystem used the tandem brake lines, but I would like to change the rear brakes to MGF discs. Quote Link to comment Share on other sites More sharing options...
nang Posted January 25, 2018 Share Posted January 25, 2018 I'm not sure if tandem brakes will improve things, To me it only means that you will still have brakes front or rear if part of the system fails. NZ and Aussie Mk2 2500 cars had these as standard.Tony. Quote Link to comment Share on other sites More sharing options...
glang Posted January 25, 2018 Share Posted January 25, 2018 Youre right Tony there wouldnt be much improvement but I believe the system operates one front and one rear brake as a diagonal pair so as to keep fairly decent braking in the event of a leak. A hydraulic differential pressure switch would also have to be installed so as to give a warning light on the dash if one circuit fails. Its certainly a safer set up but for a more modern brake feel I think Scotty would be better off fitting a servo..... Quote Link to comment Share on other sites More sharing options...
scotty71 Posted January 25, 2018 Author Share Posted January 25, 2018 so if I used a servo. what size would I need? has anyone tried to convert the rear brakes to disc?as the MGF rear brakes could fit, if there was a calliper bracket made up in steel to mount to the herald mounting. Quote Link to comment Share on other sites More sharing options...
andymcp Posted January 25, 2018 Share Posted January 25, 2018 If better brakes are installed at the rear, would the front also have to be upgraded to maintain the front to rear bias? Quote Link to comment Share on other sites More sharing options...
JumpingFrog Posted January 25, 2018 Share Posted January 25, 2018 Quoted from scotty71 so if I used a servo. what size would I need? has anyone tried to convert the rear brakes to disc?as the MGF rear brakes could fit, if there was a calliper bracket made up in steel to mount to the herald mounting. I don't think rear disc brakes are worth the effort, the original drums work okay. At least, I've managed to lock the rears in the past... As Andy said, you'd likely need a proportioning valve to maintain the front bias.If you want better braking, it's best to make sure what's there works properly. E.g. rebuilt calipers with fresh pistons and seals. A lot of people on here recommend Mintex M1144 pads as an upgrade. A servo undoubtedly helps too, Canley's (amongst others) do a kit https://www.canleyclassics.com/suspension-steering-and-brakes/brake-servo-kit - but I don't have one myself. Quote Link to comment Share on other sites More sharing options...
glang Posted January 25, 2018 Share Posted January 25, 2018 you would need to speak to the remote servo suppliers but I would have thought a 1.9 to 1 ratio unit would suffice. They are pretty easy to fit, certainly much easier than rear discs which also would probably need some sort of compensator valve and affect your insurance. Remember that most braking effect comes from the front wheels as under hard braking the back tend to lift off the ground.Of course first your existing set up has got to be 100% and then a change of pads might help. Theres recommendations on here and I did this on my Vitesse with good results. In fact if you still want further improvement the front brake set up from a Vitesse/GT6 might be the way to go...... Quote Link to comment Share on other sites More sharing options...
herald948 Posted January 25, 2018 Share Posted January 25, 2018 Quoted from glang Youre right Tony there wouldnt be much improvement but I believe the system operates one front and one rear brake as a diagonal pair... Uh, no. Sorry; that's not how it works (unless someone were to get really creative after the fact)! The split on Triumphs was always front / rear. Quote Link to comment Share on other sites More sharing options...
Bitumen Boy Posted January 25, 2018 Share Posted January 25, 2018 A word of caution on tandem brakes. I've had trouble with them on more modern cars where the master cylinder is a 2 in 1 jobbie - as I believe they all are - where the master cylinder fails and you still have no brakes. In other words, the system is not infallible.IMO it would only be worthwhile if you were going to go to the trouble of making up a system with two separate master cylinders operated by the same pedal. This has been done though I'm afraid I have no more detail than a memory of a picture of twin master cylinders and a clever linkage. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted January 25, 2018 Share Posted January 25, 2018 Quoted from herald948 Uh, no. Sorry; that's not how it works (unless someone were to get really creative after the fact)! The split on Triumphs was always front / rear. This is true. Whilst modern cars (from roughly the late 80s) have diagonal split systems which give much better braking when only 1/2 are working, the older stuff including all Triumphs, is front/rear split.The reason for this is related to suspension geometry. A diagonal split system on a Triumph or similar would cause a massive sideways pull towards the side with the front wheel still working because they have moderate caster and steering axis inclination angles. Modern cars have much greater angles, intentionally, to reduce the sideways pull caused by the loss of braking on one front wheel. The downside is much heavier steering unless PAS is fitted. I know from experience that it is almost impossible to detect when one side braking is lost on my A6 - it doesn't pull at all - just needs a harder shove to stop.In the middle of all that comes the true split line systems that appeared briefly in the 70s on Volvos, some BMWs and Austin Princesses - 4 pot calipers with two pistons on each side connected to different circuits.A hard driven Vitesse might possibly benefit from rear discs provided the calipers were carefully chosen to maintain the front/rear bias. Though if you could still find decent shoes for the drums any advantage would be slight. I don't think there's much point on a Herald. If you need more brakes on a Herald, fit Vitesse ones - all round.Nick Quote Link to comment Share on other sites More sharing options...
Einar Posted January 26, 2018 Share Posted January 26, 2018 I made a tread regarding brake upgrades. Maybe som info there. I concluded no significant improvement. See here: Sorry , link no longer available Quote Link to comment Share on other sites More sharing options...
69vitesse Posted January 26, 2018 Share Posted January 26, 2018 If the standard brakes on a 13/60 won’t stop it on a sixpence, they’re knackered and need servicing. Quote Link to comment Share on other sites More sharing options...
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