Interupter brake levers

For discussions about bikes and equipment.
User avatar
foxyrider
Posts: 5127
Joined: 29 Aug 2011, 10:25am
Location: Sheffield, South Yorkshire

Re: Interupter brake levers

Postby foxyrider » 8 Oct 2020, 7:00pm

greyingbeard wrote:Different brakes require different amounts of cable pull for them to work properly

How much cable to cross top brakes pull ? and what is their optimum brake capiler/canti/etc


Crosstops do not pull any cable, the cable passes freely through the body. They compress the outer which is why you get better results with Linear outer. As has been mentioned upthread, its possible to set them upto work almost any cable operated brake, I've got them on modern Campag Super Record DP's on one bike, HyRd discs on another and in the past i've used bikes with V's, cantis and SP brakes and brake levers from the matching carbon SR ergos, all manner of STi's to some decidedly old school Dia Compe with great success.

Provided there is no slack in the outer cable the levers will work well - i've fitted to not just my own but a good number of customer bikes over the years.
Convention? what's that then?
Airnimal Chameleon touring, Orbit Pro hack, Orbit Photon audax, Focus Mares AX tour, Peugeot Carbon sportive, Owen Blower vintage race - all running Tulio's finest!

Bmblbzzz
Posts: 3577
Joined: 18 May 2012, 7:56pm
Location: From here to there.

Re: Interupter brake levers

Postby Bmblbzzz » 8 Oct 2020, 9:29pm

willcee wrote:now I'm on discs and I wish something similar would be made for hydro systems..

Pretty sure it can be done, just the bar top levers will be "in parallel" rather "in series". Or "additional" rather than "interrupter".

User avatar
willcee
Posts: 1149
Joined: 14 Aug 2008, 11:30pm
Location: castleroe,co.derryUlster

Re: Interupter brake levers

Postby willcee » 8 Oct 2020, 10:18pm

Parallel that would be a bit more trouble, would need another line , interupt type is used on rallye cars to break the main line to the rear brakes to enable a powerful handbrake action on the rear discs without annoying the rear circuit to the back brakes... back in the day we used the master cyclinder off a hillman imp .625 Girling from memory, in one end and out the other, but in those days it was working a big drum on a live axle in a car that had perhaps 120/150 bhp and weighed less than 1000kg , now days the weight is similar or tries to be.. now 200/300++ bhp is normal with 4 wheel drive..with 10'' plus discs on the rear axles.. will

ElCani
Posts: 287
Joined: 5 Mar 2015, 11:24am

Re: Interupter brake levers

Postby ElCani » 8 Oct 2020, 11:07pm

https://bike.shimano.com/en-EU/product/ ... 812-R.html

Shimano introduced them with GRX. I assume they’ll work with other Shimano hydraulic systems too, but I haven’t checked.

User avatar
willcee
Posts: 1149
Joined: 14 Aug 2008, 11:30pm
Location: castleroe,co.derryUlster

Re: Interupter brake levers

Postby willcee » 8 Oct 2020, 11:21pm

Thanks..I Had a look, and at the dealer install procedures reckon i'll try one for a rear brake which i don't use much anyway... let you all know when I have it mastered..just ordered from Tweeks 48 home for a rear.. I have no room for a right side...pics later will

User avatar
Si
Moderator
Posts: 15154
Joined: 5 Jan 2007, 7:37pm

Re: Interupter brake levers

Postby Si » 17 Oct 2020, 12:11pm

Well, I removed the interupter levers and the brakes now work loads better....but not necessarily for that reason!

Image

No doubt, someone will ask, so: due to an old injury I can't use the drops on drop bars so there's not really much point in having them. The new set up gives several advantages:
- brakes work a lot better as i'm not using them from the hoods - they worked OK before but I prefer a sharper brake and this has given it
- in crashes (it's used off road a lot) the drop no longer swings round and hits the top tube
- on very steep climbs I no longer hit my knee on the end of the drop
- I can fit my bar bag

However, having said in the OP that I didn't ever use the interupter levers I now realise that I did.....not for stopping but rather when getting on the bike to hold it still on hills....was using them without realising it!

djb
Posts: 176
Joined: 24 Mar 2013, 9:27pm

Re: Interupter brake levers

Postby djb » 17 Oct 2020, 1:38pm

another rider who has gotten used to using interrupter brake levers, really like having them.
As stated by others Si, the cable just runs through the setup, so no friction really. Ive replaced cables on the first bike that had them with cantis and rim brakes, and also installed them also on a touring bike I built up a few years ago with mech discs.

re handlebar bags-- I easily can use my Ortlieb handlebar bag on both my bikes, the trick is to simply turn the levers downwards to a slightly more downward tilt than my usual preferred downward tilt, and even on my more heavy duty touring bike, they work fine (a little tight, but workable)

Ive always found interrupters just so very handy when riding in the city and also when riding with friends and being behind someone with hands on tops--No they do not stop as hard as the hood levers, but thats ok, they are still reasonable.
LRM_EXPORT_20180212_091555-1.jpg

Bmblbzzz
Posts: 3577
Joined: 18 May 2012, 7:56pm
Location: From here to there.

Re: Interupter brake levers

Postby Bmblbzzz » 17 Oct 2020, 3:02pm

That certainly is a distinctive set up, Si! And yes, braking from above the hoods is never as powerful as from below.