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Frankenbrakes and brake improvement discussion

Happymtb.fr

Turbo Monkey
Feb 9, 2016
1,946
1,298
SWE
I used SRAM DOT grease on the piston seals when 1 lever got sticky.
I have some from Avid, the package is so big it will last me 1000 years if not more.
The left blue circle area is outside of the actual hydraulic system, so I'd guess clean it well then use a light oil
Thanks, I went for the same oil I use on my chain. By the way, the ball joint pointed by the arrow is also outside the hydraulic system :nerd:
 

Andeh

Customer Title
Mar 3, 2020
1,061
1,028
I have some from Avid, the package is so big it will last me 1000 years if not more.

Thanks, I went for the same oil I use on my chain. By the way, the ball joint pointed by the arrow is also outside the hydraulic system :nerd:
Yeah I meant the seals on the piston after that. Hayes told me a dab of grease on the end of the ball joint. I used DOT grease because it was close but I'm sure something else would work too, like Slick Honey.

Do any of you with Dominions have squeaky levers?
When 1 of my levers was getting sticky, it was also a bit noisy. I replaced the bearings first, then greased the ball end, and finally cleaned and greased the piston seals. The last one did the trick - there was a tiny bit of grit stuck on one of the seals.
 

Adodero

Chimp
May 13, 2024
1
0
Has anyone tested Cura 4s with the new-ish FCS lever? They claim it increases leverage and some reviews indicate it provides more power along with being slightly longer, but I can't seem to find much info aside from the NSMB review. Anyone know how much it changes the leverage and if it's a big improvement?

Also, if anyone wants to add Intend Trinity to the spreadsheet: they claim 17mm pistons, 9.5mm master, and mechanical leverage of 7.3 with overall of 46.78:1. I haven't verified on mine, though.

Do any of you with Dominions have squeaky levers?
Yes, I had this problem on one set. I don't think I ever solved it, instead I put them on my wife's bike and it helps me keep track of her in the woods :D

Joking aside, I seem to recall Hayes telling me you could remove the lever and lightly grease the pivot. I never tested that, though. I definitely remember how irritating it was, so you aren't alone. Maybe call Hayes and see what they suggest.
 

canadmos

Cake Tease
May 29, 2011
20,876
19,975
Canaderp
Has anyone tested Cura 4s with the new-ish FCS lever? They claim it increases leverage and some reviews indicate it provides more power along with being slightly longer, but I can't seem to find much info aside from the NSMB review. Anyone know how much it changes the leverage and if it's a big improvement?

Also, if anyone wants to add Intend Trinity to the spreadsheet: they claim 17mm pistons, 9.5mm master, and mechanical leverage of 7.3 with overall of 46.78:1. I haven't verified on mine, though.



Yes, I had this problem on one set. I don't think I ever solved it, instead I put them on my wife's bike and it helps me keep track of her in the woods :D

Joking aside, I seem to recall Hayes telling me you could remove the lever and lightly grease the pivot. I never tested that, though. I definitely remember how irritating it was, so you aren't alone. Maybe call Hayes and see what they suggest.
I'm not really annoyed by it, but yeah I'll message them and see or just lube pivot.

I was flicking them out of habit yesterday, and a buddy was looking around asking if anyone else can see the bird chirping nearby :rofl:
 

Andeh

Customer Title
Mar 3, 2020
1,061
1,028
I'm not really annoyed by it, but yeah I'll message them and see or just lube pivot.

I was flicking them out of habit yesterday, and a buddy was looking around asking if anyone else can see the bird chirping nearby :rofl:
Hayes CS is really quick to respond in my experience.
 

englertracing

you owe me a sandwich
Mar 5, 2012
1,590
1,086
La Verne
Did anyone ever try formula cura levers with magura calipers?

Ive got one cura 4 that works great!
And one with lazy pistons... even full disassemble, clean and rebleed and still lazy as fook!

Hows pad retraction on the mt calipers?
 

Happymtb.fr

Turbo Monkey
Feb 9, 2016
1,946
1,298
SWE
Hows pad retraction on the mt calipers?
Mt5 have decent pad retraction, definitely more than Formula on the Cura 2 (I don't know if the 4 differ from the 2 in that matter? Probably not)
Mt7 have less pad retraction than Mt5.

Magura can have lazy piston too. I have had it and manage to mitigate it. There is no spare parts available from magura. Formula on the other hand usually has plenty of spare parts listed. Did you try to get new seals and maybe even new pistons for your Cura caliper?
 

slimshady

¡Mira, una ardilla!
one with lazy pistons.
I'd tag the lack of response to insufficient oil movement rather than lazy pistons. The MC's oil pushing capacity is OK for two-piston calipers, but it's simply not enough for the 4-pot ones. This gets worse as the pads wear out. I've seen Cura 4s with 50% pad wear getting spongy AF and no bleed would get them back to the original tight lever feel.
 

englertracing

you owe me a sandwich
Mar 5, 2012
1,590
1,086
La Verne
I'd tag the lack of response to insufficient oil movement rather than lazy pistons. The MC's oil pushing capacity is OK for two-piston calipers, but it's simply not enough for the 4-pot ones. This gets worse as the pads wear out. I've seen Cura 4s with 50% pad wear getting spongy AF and no bleed would get them back to the original tight lever feel.
Well..
I completely disassembled....
Couple insanely tight pistons/seals.
 

Udi

RM Chief Ornithologist
Mar 14, 2005
4,917
1,210
Ive got one cura 4 that works great!
And one with lazy pistons... even full disassemble, clean and rebleed and still lazy as fook!
Is it the rear that's bad?
Like happymtb suggested, it's worth actually replacing the caliper seals - they deform and change in durometer over time which affects retraction and lever feel/response. The pistons should be replaced with the seals if the pistons are non-metal. I'd try it before ditching, often makes a noticeable difference. It is an art to get the new ones in though (if you think the old ones are tight...), take your time.

Not to dismiss the issue slimshady mentioned but if you're happy with one of the brakes (and have new pads) there's likely a problem with the other.

As for the magura caliper, going from 4x18mm -> 4x17mm...
 

Nick

My name is Nick
Sep 21, 2001
24,196
14,956
where the trails are
Is it the rear that's bad?
Like happymtb suggested, it's worth actually replacing the caliper seals - they deform and change in durometer over time which affects retraction and lever feel/response. The pistons should be replaced with the seals if the pistons are non-metal. I'd try it before ditching, often makes a noticeable difference. It is an art to get the new ones in though (if you think the old ones are tight...), take your time.

Not to dismiss the issue slimshady mentioned but if you're happy with one of the brakes (and have new pads) there's likely a problem with the other.

As for the magura caliper, going from 4x18mm -> 4x17mm...
I have to wonder if that’s what happened to mine. They were dialed at first but just degraded after a year + and just always rubbed.