Upgrading Brompton to Magura hydraulic brakes?
 

Hello

In case someone here has done it, do you confirm that retrofitting a Brompton with Magura HS11 hydraulic brakes requires making and welding adapters on the frame?

http://bikeforums.net/attachment.php...hmentid=509571
https://www.flickr.com/photos/941869...7638657018836/

Thank you.

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Edit: It looks like other items can replace the side pull brakes on the Brompton with no further work:

HS33 R Urban
http://bikeforums.net/attachment.php...hmentid=509580
HS33 R Urban*| MAGURA

I have a Bike with HS 33 It is mounted on V/cantilever Posts .. (Koga WTR Not a Brompton)

That is a custom Mount* .. yes you need (?) the fork changed *( for Trials and Unicycle use)

There are Bodges from the BMX world putting V brake posts on a bolt on Plate .

The Urban have the Hose sticking straight up, from the caliper so Your Fold will be compromised
(& may not have the reach to the Rim on Brommys)

The lever on the HS22 is from the HS 33 of a few years back .

I put Kool Stop Dura 2 'salmon' inserts in the existing Brompton double pivots and they work Fine ..



Buy a Moulton and put the HS33 R Urban brakes on It, Instead of like Campag skeleton Side pulls, short reach.

By the looks of it, the caliper brake arms are almost certainly not going to be long enough to reach the rim braking surface without either the brake mounting bolt or using extended brake shoes. You may even need to do both.

Other problem is folding a bike with hydraulic cables without them spliting. I dont fancy it. But jetstream ex users report no issues i have heard of.
On a 16" with small clearence they will be a nightmare set up and will wear your rim out in no time if you get them working.
Getting a birdie seems more sensible.

Sorry, I meant to say the brake arms won't reach the rim braking surface without relocating the brake mounting bolt or using special extended brake shoes.

Thanks for the tips.

Looks like it's a bad idea :-/
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Edit: To make matters worse, there's not enough clearance to use the baggage block. Reply from Magura : "you need 6cm between the Bolt and the end of the caliper."

JMHO,but not a fan of hydro rim brakes. Because the pads are thicker than disc pads,the pistons have to travel further,esp when the pads are worn. This exposes them to more dirt/corrosion,and leads to the seals getting torn up. If you insist on hydros,def make sure to keep them clean,or you're in for a rebuild.

Also they are a pain to service. I could never bleed them properly and I struggled to find a shop willing to do them. Thats a pain if you need to ride to a non local shop on a low geared trails bike with no seat!!

My next trails bike,if there is one, will have V brakes or discs. Cant see me on one again.

Why not use SRAM Force S700 Hydraulic rim brakes? I am also interested in hiding the cables of brompton bike inside the frame, and I think Hydraulic brakes is one way to do it.

Only available for drop bars?

https://www.sram.com/en/sram/models/sb-700-hrd-b1

Quite pricey too ($€300).

I dunno. Looks like it can work.

https://cimg7.ibsrv.net/gimg/bikefor...75b1c734aa.png

The question is how long will it work, i.e how quick the hose that hits the front block will be damaged ?

Protecting hydraulic lines is certainly not new to industry and not even new to cycling.

https://cimg0.ibsrv.net/gimg/bikefor...a4a43709d9.png

Possibly not 100% relevant, but I fitted Magura HS11 brakes to my Dahon Espresso folder and I haven’t had any problems with the hoses splitting.

The shifter housings have needed to be replaced, however, so I can confidently say that the hydro hoses are more durable than Shimano shifter housing.


https://cimg0.ibsrv.net/gimg/bikefor...7e71c9f11.jpeg

The problem with the Brompton is that it has its front carrier block just above the front brake caliper.

A caliper with a top centered cable or hose output is a problem because it interferes with the front carrier block.

It is the reason why Brompton uses a special caliper with a down left cable output instead of the usual top right cable output of all front brake caliper.

A Brompton without front carrier block or the above Dahon has no problem with a top centered or right hose output.

Note that the Brompton also need a medium reach caliper, short reach brake calipers can only be mounted on the Brompton with an adapter.

Thanks for the pic. Source? Which Magura is that?

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Edit: From TPW's Facebook page

Couldn't reply message yet. Winfried, I think it's possible to buy the SRAM S700 Set and sell off the brake lever. We can use MTB brake lever for the replacement.

The reach is the same on both the titanium and steel fork.

Both require medium reach caliper. Short reach road caliper cannot be used without an adapter.

The problem of the hose blocked by the front block is more obvious on the second picture.

https://cimg3.ibsrv.net/gimg/bikefor...fe8900546f.jpg

Is that a real show-stopper, provided a protection is added per TCS' message above?

For some reason, the HS33 R Urban is not listed on Magura's site. Discontinued?
https://www.magura.com/en/components/bike/rim-brakes/
https://www.amazon.de/-/en/Magura-HS...dp/B071W591TC/

Is the Brompton a medium or short reach?

It looks like there's not much clearance: Does it mean those brakes won't take fenders/mudguards?

The Brompton is a medium reach o accept fenders and 35mm wide tires.

The second picture show clearly the adapter between the fork and the caliper that lower the caliper bold attachment.

Ti Parts Workshop propose this kind of adapter to mount eeBrakes on a Brompton but it can be used with other short reach calipers.

Yes, its a show stopper if you want a front block. For the eeBrakes, TPW has also a kit that moves the cable output from the top center to the bottom left.
https://cimg9.ibsrv.net/gimg/bikefor...30f4fb5b41.jpg
https://cimg9.ibsrv.net/gimg/bikefor...6af3e89a4f.jpg
eeBrake complete kit with bottom left cable output
https://cimg7.ibsrv.net/gimg/bikefor...92dfa3248b.jpg

Has anyone thinking of using Magura Hydro Cantilever/V-Brake. It's just the mount is not available on brompton, but there are such adapter plates available like U-brake plate for BMX.

Interesting.

Would it work with Magura HS11?

Won't the HS11's hose interfere with the Brompton's luggage block?

What about installing a U-plate in the back of the fork, like shown in this tread from 2015?

What's the difference between the four models of rim brakes Magura currently offers? HS11, HS22, HS33, HSI.

https://cimg7.ibsrv.net/gimg/bikefor...c723cbcbf6.png

possible to route the cable inside the stem and go further via the head tube exiting at the bottom steerer? Since it’s a hydro cable some bends wont affect the performance doesn’t it?
There is this hollow stem bolt product that can be used.

Hi Winfried, you are right, they might work but it doesn’t look nice with more cables sticking out like that. It beats the purpose when you want to hide the cables in the first place. Furthermore, it looks bulky with the current adapter plate.

Magura HS-11, HS-22 a d HS-33 has similar performance, the differences are the material they use and design of the lever. HS-33 has all metal design and looks sturdier than HS-11 with some plastic/resin material.

There are two issues:

1. Finding a way to stick a Magura rim brake on a Brompton, either directly through the hole at the top (Magura HS33 R Urban), or through the use of a U plate (→ HS11 etc.)
2. Getting the brake hose out of the way of the luggage block, or at least without interfering too much. I personally don't mind having to pay attention when pushing/pulling the bag so as not yank the hose if it means better brakes for not much money compared to the alternative$ (Cane Creek, Ridea).