Kevinrpayne Posted September 24 Report Share Posted September 24 Hi all, somewhere in the dark and very distant past, I recollect that one of my cars had a dual line brake system that worked on the diagonal wheels. It was done for safety, such that if one loop failed then you at least had some brake capacity. I’m sure it was a Triumph but could be wrong. Has anyone come across this and secondly, has someone modified their car to accommodate ? thanks Kevin Link to comment Share on other sites More sharing options...
Josef Posted September 24 Report Share Posted September 24 Later Triumphs (later TR6, last Spitfire 1500s etc) had dual circuit brakes, but that’s a circuit for the front and one for the rear. Link to comment Share on other sites More sharing options...
johny Posted September 24 Report Share Posted September 24 yes the GT6 as well and its all explained in its WSM including the pressure differential detector alarm unit. I cant see any reason why it couldnt be installed on earlier models as long as theres room for the bigger master cylinder... Link to comment Share on other sites More sharing options...
Kevinrpayne Posted September 24 Author Report Share Posted September 24 Thanks that would explain it as I did have a late 1500 spit as a student . I tried searching but didn’t come up with anything, I’ll search again. Is it possible to also fit servos ? kevin Link to comment Share on other sites More sharing options...
johny Posted September 24 Report Share Posted September 24 Ah a servo might be more complicated. Some of our cars were supplied with a remote servo but as far as I know dual versions of these are not available (space for one would be tight as well) and of course one working on only one circuit would operate the differential alarm... Link to comment Share on other sites More sharing options...
Kevinrpayne Posted September 24 Author Report Share Posted September 24 Hum. Perhaps not worth it then but thanks for the responses kevin Link to comment Share on other sites More sharing options...
johny Posted September 24 Report Share Posted September 24 Regular maintenance and inspections of your existing brake system are highly recommended😁 Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 25 Report Share Posted September 25 Im sure certain models of GT6 have a servo linked to the front brakes but not as a full dual circuit . pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 25 Report Share Posted September 25 1 hour ago, Pete Lewis said: Im sure certain models of GT6 have a servo linked to the front brakes but not as a full dual circuit . pete If I remember correctly (and that's starting to be rare these days) the GT6 servo was front wheels only with the corresponding larger rear wheel cylinder to compromise for any imbalance. I remember the Spitfire 1500 had the dual circuit from the last one I restored, as I had serious problems bending both brake pipes to match and not look like a dog's dinner, and by the time I had measured, flared and bent one to fit, the other was always too short. It took a few times! Link to comment Share on other sites More sharing options...
johny Posted September 25 Report Share Posted September 25 yes I suppose Kevin might be able to have a dual circuit MC with the pressure diff switch just after it, then take the front brake line to a servo to give assistance just for the calipers? As you say though could affect braking balance.... Link to comment Share on other sites More sharing options...
johny Posted September 25 Report Share Posted September 25 I take it back as it looks like the dual circuit master cylinder is so big you need to modify the bulkhead to fit it in! Link to comment Share on other sites More sharing options...
JohnD Posted September 25 Report Share Posted September 25 (edited) Yes, you do! I put dual circuit brakes into Silverback, had to cut a hole in the bulkhead and fit a fabricated alloy box to enclose it. Kevin, I did this so that I could fit a brake pressure adjusting valve to the rears, and a hydraulic handbrake, but I didn't fit the PDWA. I was surprised to find that Triumph made the two circuits front/back, and not the diagonal style that other makers did. If your rear brakes stop you more than the fronts, that's a recipe for a spin! John Edited September 25 by JohnD Link to comment Share on other sites More sharing options...
Kevinrpayne Posted September 25 Author Report Share Posted September 25 I think I’ll stick with Johnny’s suggestion and leave as it is. I’ve already had to fit a brake balancer valve as the rears were locking too much. I recollect that I a reasonably recent Courier someone suggested alternative pads ( I fitted greenstuff I think) that worked better . Any recollect toons ? kevin Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 25 Report Share Posted September 25 any thing is better than green Pete Link to comment Share on other sites More sharing options...
Nigel Clark Posted September 25 Report Share Posted September 25 Don't worry about retro fitting dual circuit braking. It's Is much more important to ensure the existing brake system is in top condition and working as Triumph intended. By all means fit uprated front disc pads. Mintex 1144 are well rated by many here on the forum, me included. Just be sure to bed the new pads in according to Mintex instructions. Nigel Link to comment Share on other sites More sharing options...
JohnD Posted September 25 Report Share Posted September 25 Yes! Triumph brakes, in good condition, work very well! And yes! Mintex are an excellent make. Their 1144/1155/1166 used to be for road/fast road or race/full competition use. But now this series is discontinued, stocks still exist, but Mintex now make MRM 1801/1802/1805 for the same applications. These brake materials differ in the temperature range that they are effective in. 1805 must be at a high temp to exert friction- they feel like the car is on ice when cold. 1801 works when cold or just warm, so straight out of the garage and in traffic, but will fade if raced. In my experience 1155 worked well when cold, and never faded even when racing, and I hope that 1802 will do the same - I'm still on 1155! John 1 1 Link to comment Share on other sites More sharing options...
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