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IIIPRO E4 4-Piston Hydraulic MTB Brakes - Are they to be trusted?
final forum:
Anyone who owns these brakes know if the newer IIIPRO IV4R 4 Piston Disc Hydraulic Brake, are any better or differernt?
Also i'm looking for better real estate on my left handlebar. Could I put my twinloc on the handlebar clamp or my dropper lever? Either that or going with a sram twistloc 3P remote. But that costs the same as these brakes. My Magura MT8 SL just seem so weak.
https://www.aliexpress.us/item/3256806171110649.html?spm=a2g0o.detail.pcDetailBottomMoreOtherSeller.2.2dcbBsR6BsR6uw&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.40000.326746.0&scm_id=1007.40000.326746.0&scm-url=1007.40000.326746.0&pvid=64dfc9f3-c989-4372-a35a-7154f7583f0b&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.40000.326746.0,pvid:64dfc9f3-c989-4372-a35a-7154f7583f0b,tpp_buckets:668%232846%238110%23350&pdp_npi=4%40dis%21USD%2172.90%2156.13%21%21%2172.90%2156.13%21%40210330dd17278410195177751e5945%2112000036879659540%21rec%21US%21191630953%21X&utparam-url=scene%3ApcDetailBottomMoreOtherSeller%7Cquery_from%3A
Tijoe:
Are They to be trusted? To date, I have 3 sets in operation on different bikes. Overall I have been pleased with their performance. This being stated...
I recently finished riding a 600 mile bikepacking route that really put my loaded bike through the grinder. You name it, I encountered severe riding conditions almost every day of the ride. The brakes worked well until the last 2 days, I was having to pull the lever farther to get the same braking power. I figured it was due to pad wear.
Yesterday I replaced the rear pads. After replacing the pads, the lever pulled all the way to the bars without locking the calipers on the rotor while it is on the bike stand.
I removed the bleed screws, and set up my brake bleed kit, and went through my typical process that usually gets any bubbles out of the levers and calipers. No improvement. next I performed both a forward and reverse flush of the mineral oil. No difference. (I do this with the caliper removed from the frame, pads removed and the thick plastic spacer mounted between the 4 pistons.)
I am wondering why I can't get the brake to work again. leakage across the brake lever piston? Bubbles I can't get out of the caliper?
Anyone else have this type of experience with these brakes?
Tijoe:
This morning I swapped out my lever assembly and the caliper with a new IIIPro lever assembly and caliper. Purged fluid through the brake system, like I usually do. New brakes purged quickly and has good lever response like it used to.
One item of note. The new caliper I installed has a second purge port on the top of the caliper that my other IIIPro calipers does not exist. I am wondering if they found out they have an air bubble removal problem in the calipers and added the second port. (See attached images)
I am confident that I have a problem with the caliper. I plugged the hose inlet and the lever built pressure when I pulled on it. Then I installed the new lever and the problem persisted. Swapped the caliper, bled the brake and all became good with great lever action.
What would cause the caliper to stop working after only a pad swap? Despite trying all sorts of techniques to get bubbles out of the caliper, I was not able to get this brake to work. I will have to take the caliper apart to determine it's problem.
Tijoe:
Problem determined: Per my previous post, I explained that I replaced my pads and no matter what I tried I could not get the rear brake to work, so I replaced the caliper and lever with a new one.
Today, I set up the old lever and caliper on the bench. Upon careful observation of the caliper pistons, I see tiny bubbles of mineral oil coming out between the pistons and the caliper housing. Looks like the seals have gone bad on 3 of the 4 pistons.
Then I tested another caliper I removed in the past because it appeared to not be working. Same problem! Little bubbles between the piston and caliper bores.
This is disconcerting because this means I have had caliper failures on 2 out of 8 calipers. My first set was purchased and installed in early 2023. When I look up the mileage since installing the IIIPro brake on several of my bikes, the distance ridden is perhaps 3K miles.
Has anyone researched and ordered some sort of a rebuild kit? (In preparation, I ordered a piston cap removal tool.)
I will write IIIPro soon ans ask about rebuild parts. Bummer....
nicklej:
I had similar issues. Bled mine multiple times after different ride intervals and they'd always start losing power to the point they were not functional. I don't know what options there are for a build kit but I replaced the brakes and maybe one day will look at servicing them again. I thought I had an issue because lots of riders sang their praises on these brakes but mine were always really weak. I'll stick with Shimano for now.
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