Rear brake fail

JRock said:
Wonder if Triumph used the same rear brake master cylinder as the XDiavel. A brembo, I think.
This is a continuing issue with that bike, rear brake goes away.
Click to expand...
Good thought because I had the same rear brake problem with my 2019 X Diavel!
 
I had the recall done because of a VERY soft brake on my brand new 2021 GT. That was 1 1/2c yrs ago and all seemed fine but just recently, same thing.
Dealer said he road the bike and the brake was fine but I told him I've been riding 60+ years and have had 30 bikes and will not accept this rear brake function.
They bled it and, so far, it is better. If this happens again, I will file a lawsuit with the Lemon Law firm against Triumph!!
 
The following is from NHSTA website and may be of important information to those that aren't aware or haven't had the recall fix completed.

OCTOBER 31, 2023NHTSA CAMPAIGN NUMBER: 23V730000
Rear Brakes May Require Extended Distance to Stop
Extended stopping distance increases the risk of a crash.


NHTSA ID Number: 23V730000
Manufacturer Triumph Motorcycles America, Ltd.
Components SERVICE BRAKES, HYDRAULIC
Potential Number of Units Affected: 3557
Summary
Triumph Motorcycles America, Ltd. (Triumph) is recalling certain 2020 Rocket 3 TFC, 2020-2024 Rocket 3 R, Rocket 3 GT, 2022 Rocket 3 GT Triple Black, and Rocket 3 R Black motorcycles. The rear brake master cylinder may fail to move fluid through the system properly, requiring an extended distance to stop.
Remedy
Dealers will replace the rear brake master cylinder, free of charge. Owner notification letters were mailed November 20, 2023. Owners may contact Triumph's customer service at 1-678-854-2010. Triumph's number for this recall is SRAN 611.
 
I seldom use the rear, that said my dealership replaced the rear master cylinder (voluntary recall) and manually bled the system twice. It’s been working ever since (10k km no issues). as a side note when you pull the front brake the abs will apply additional 30% break pressure to the rear, I did not know this. The down side is the rear needs need replacement sooner than expected, at least for me not using it…
 
Same with me. Just front most of the time. I didn't know they were linked. I wonder if the issue was fixed for my '24
 
I use my rear brake all the time, especially when coming to a smooth stop and in slow speed maneuvers such as u-turns. Most instructors support this method as it stabilizes the bike for what I've mentioned. You might try coming to a stop with both brakes and the last 8 to 10 feet just use the rear brake. The you have just the left foot down nice and stabile ready for when the light turns green.
 
Hi to all,

I'm a loyal Triumph customer (in EU), I have bought several bikes from Triumph and the same dealer, and I like the latter who has been available, useful and honest. I own a 2.5 R3R since late 2020 (bought that new), and here is my rear brake ****storm story up to now:
  • Soft/weak rear brake could be felt even before first mandatory maintenance at 1000KM
  • They did 4 rear brake bleeds of the "SRAN587" recall process over 3 years and about 10000KM, never solved it (except for the few hundreds KM/weeks directly after bleed). Pedal goes completely soft and I just get no rear brake power at some point. The hill hold feature also fails in such circumstances
  • I wrote a formal notification letter to Triumph HQ in my country in mid-2023 - ironically I had to partly pay for the last rear brake bleed because "out of warranty" and this made me had enough. This rear brake issue is a defect on a security function which had been notified to dealers straight from the start, which has not been fixed under warranty, for which there are plenty of testimonies on the Internet, and it has been demonstrated by dealers and testimonies that the bleed never did **** about the defect. I just asked for it to be fixed properly. I never had the honour of a written answer from Triumph, but they did call me more than 1 month later in 2023 to tell there would be a new recall in November 2023 which would likely fix the issue
  • I received a letter for the new recall ("SRAN611" or "23V-730") in November 2023 like all other customers in EU, and had the rear brake cylinder replaced by dealer as required by Triumph
  • 2 years, 2 yearly maintenances and around only 3000km later (I'm not riding much... but I must admit I'm discouraged riding a bike which has a latent break fault at best, and a rear brake which just does not work when it happens), it is still not fixed. My dealer proceeded with a 2nd additional bleed (making the total count reach 6) after SRAN611 recall, using the "most up to date bleeding process", using "topmost racing brake fluids" and doing it "twice in a row", but admitted there are other failing cases after SRAN611 and they don't have a solution.
Clearly the cause has not been fixed (the rear or global braking system in this bike is just breathing air somewhere), and Triumph is just not puting enough efforts fixing this (which I guess is the case until someone dies and/or someone have them cancel a sale years after, opening the breach).

Over 5 years and discussing with 2 experienced mechanics at the dealership, I have heard about 3 main hypothesis that might at least play a role:
  1. the braking system was wrongly setup by Triumph during specific circumstances (COVID, new factory in new country or so) / the Brembo callipers are faulty as they were manufactured under specific circumstances
  2. the rear brake fluid reservoir is too close to heat source (notably exhaust) and no break fluid can bear with the temperature point which is reached here
  3. the rear brake calliper on our R3 is actually a front brake calliper and is not designed to be setup/actioned this way
Those might all be urban legends, but I've seen nothing from Triumph explaining the tested/dropped root causes, and I have definitely seen Triumph NOT trying anything which would fix 1, 2 or 3.
 
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