Lewis LH4 disassembly

Disassembly and basic analysis of Lewis LH 4 hydraulic MTB disc brake.

For technical stuff I created a new KZbin channel @cerniworks. There I posted a similar video, disassembling and analyzing Lewis LV2 brake: kzbin.info/www/bejne/jaPdaqlve5yir8U

[@a8f235]

Love that there's no olive. Seems like an insignificant detail, but small parts like that can be sold at the price of gold at the local shop, and it's very good to just know there's no need to even get one. Pretty nice that you did this video because I always want to know how to take things apart, and just with a video like this you have so much better understanding already. Top job, man.

[@symmetricon1982]

Very well machined, very good materials

[@awesome_mountainbike]

Nice Video! Good Job.

[@portex7724]

Perfect, thank you ❤

[@bjornfongern4850]

Look nicely made. I am surprised/impressed. Just the clamp appears to be a bit flimsy. I have the Sram hinged clamp and the Hope T4 clamp here for comparison and both look a lot more substantial. Especially the Hope.

[@mtbboy1993]

I see Lewis get get a lot of comments about copying Trickstuff and Patent/IP infringement, but it looks like they did not have a patent or the patent lapsed and got deleted.I can't find any patent for the brakes, I see Trickstuff does 3 year patent on the products that are listed on Google Patents now, but some expired. BTW a centre lock adapter might come, cus I saw a patent for it. But I repeat, no brake. So in that case it's legal what Lewis is doing. If Trickstuff had a lapsed patent, that's not even to be found now.

[@aledska]

Hello, Do you know the size of the wrench you used to take off the grub screw on the reach adjuster? I'm trying to take my levers apart and can't find a wrench small enough.

Uff I used some small torx

[@theArtiist_David]

Nice Trickstuff brakes-- wink wink...

[@jaredjackson8097]

Is there a specific size/spec for the brake hose? I looked into ordering these but a supplier told me the LH4 only comes with silver brake hose and I would like black hoses. Wondering if would be an easy swap to a different type of hose.

No, it is standard 2mm ID / 5mm OD diameter hose. They use EZmtb. You can easily swap it. But since the lever has such a high leverage ratio, braided hose is advised.

[@jaredjackson8097]

@ Thanks!

[@finroddd]

these brakes caused a discussion over youtube. Did you already test them? Any feedback?

Yes. There are already ~15 sets in the wild around here, being ridden in bike parks, local trails, enduro races etc. The feedback is positive, everyone who tries them is impressed with performance and build quality.

[@finroddd]

@ thank you very much - the thing that these brakes definitely miss - is a feedback from riders who actually use them. All the best, man! Ride well!

[@InfectAion]

Well, I just got my Lewis LHT and the free stroke / bite point adjustment screw is heavily sticking. Can't turn it without having to hold the lever reach knob with a pipe wrench. Otherwise the whole screw with the knob is turning with it. Honestly im really disappointed since they are brand new and these little fine mechanic parts seem to be representing the usual china quality :/ Besides that theyre by far the best brakes I ever put hands on. From the way they feel to the unmatched braking power.

[@mtbboy1993]

Curious is it matters which mineral oil you use. 🤔 Will Shimano or Formula do? What do they use?

[@mikeanderson9977]

I emailed Lewis and they claim any brand mineral oil.

[@mtbboy1993]

Sweet. I think all should be safe, but I was curious about the performance, some claim only their mineral oil will work optimally. But if it does not matter, that's superb. @@mikeanderson9977

Any mineral oil should be fine. I use bleedkit.com oil.

[@OrangePowerOP]

Zanimivo, se dobijo kje v slo ali direkt naročilo?

cerniworks.com in wheelbase (v kratkem)

[@mtbboy1993]

I they have a another version with leverage adjustment too.

Yes, LH4t has adjustable leverage ratio.

+ titanium bolts & caliper pistons. The pistons in a caliper are bigger too - 4x17mm. LH4 on the other hand uses 17 and 14mm pistons.

[@mtbboy1993]

Yep, knew of the titanium hardware, and pistons. Currently they are the first on the list of brakes to try. They look promising. @

[@a8f235]

@ The pistons are half 'n half so titanium shell with ceramic inside.

[@MichalSzul]

Kind of disappointing that there is no dust seal for master cylinder push rod. Same problem as in shimanos.

[@theshadow8008]

Is pads and parts available worldwide?

[@cerniworks]

Pads are Hope E4 shape - available almost everywhere. I have a stock of spare parts - seals, diaphragms, clamps, screws etc. here in Slovenia.

[@rezenclowd3]

No shifter mount? Wow. Still, I would never give them money as they are a blatant copy of the Trickstuff line.

[@mtbboy1993]

They have bite point adjustment, Trickstuff don't, also they have a version with leverage adjustment too. The bleed port is not on the side but at the top. yes there are some similarities. I don't know if they copied Trickstuff, maybe they based it of it.

[@jaredjackson8097]

They make a sram match maker adapter now.

[@gavinatkins3371]

Trickstuff had it coming with their inability to supply and megabucks cost - they will still be the gucci option, but these look like they could be the riders choice

[@rezenclowd3]

@@gavinatkins3371 don't support the Chinese trolls

[@mtbboy1993]

I like that Lewis went for bleed port on the top, with trickstuff you have to have the lever off the bike to bleed it, cus the lever has to be horizontal cus the bleed port is on the side. I like they have a brake with leverage adjustment too.@@gavinatkins3371

[@Dorthiven13]

Chinese Trickstuff Ripoff - I hate everything about it!

[@johnlucinsky992]

I have a friend with these on an e bike and they work Extremely well, I will be purchasing in the near future while you will still be deciding whether to venture out of your small world. The fact that they have taken something further than the original is called Progression, the Future has always been based on this.

[@Dorthiven13]

​​​​@@johnlucinsky992what are you talking about? They just copied a Trickstuff design. Where is the progression in this? Its not a big faceless Corporation they stole from but a small manufacture where a handful of passionate people are developing and assembling these amazing brakes. I myself have a Maxima and Direttissima and i just hate the fact that these chinese guys just dodge the effort and steal technology and design from these good folks in Freiburg and undermine their livelyhood...they even used very similar names for their products before starting to sell outside of China

[@rastanonascension5246]

And china some how never gets in trouble for steeling patients, ideas, but ther steel or metals are all weak and inferior, some parts of the uk they call it money metal… I’ll buy them only if they bring the price down to £25 pounds for both!

[@andreaTRY2FLY]

You mean correctly priced Trickstuff brakes

[@Dorthiven13]

@@andreaTRY2FLY kzbin.info/www/bejne/j5jQp6Gbrth6aaM&ab_channel=KermitMemeTemplates

[@portex7724]

Top Job😊 Have you measured the Diameter of the lever Piston?🥲

Lever piston: 8.7mm (probably 9mm bore) Caliper pistons 14mm and 17mm Lever length ~90mm Effective lever length ~78mm Lever pivot - pushrod pivot ~12mm