Other Resources > Component Deals & Selection
IIIPRO E4 4-Piston Hydraulic MTB Brakes - Are they to be trusted?
Tijoe:
I am researching how to get new seals. No reply from IIIPro on what it takes to rebuild them.
I was able to remove 3 of the 4 pistons, without the cap removal tool. (Ordered one off Aliexpress.)
As far as I can tell, these caliper are roughly cloned from Hope V4s.
They have 16mm pistons. (15.9mm measured.)
They appear to require a 20mm OD x 16MM ID X 2mm wide square O-ring. No clue on durometer (hardness), or if they start out with some special shape feature, or if they are a regular square 2mm x 2mm square o-rings.
Tijoe:
The Hope seals arrived this past Saturday. This morning I installed 4 new HNBR red seals into the failed caliper and installed the pistons. On the bench, bled new mineral oil through the lever and caliper.
After all of the bubbles were gone, I checked for firm lever action. Fail! The lever is still soft. I took a look at the pistons and small bubbles of mineral oil are still coming out between the pistons around the seals.
Something simple like new seals didn't do the trick. The new seals have the same dimensions as the old ones within the limits of my micrometer. The pistons look brand new. No indication of any wear on the surfaces.
Since they are still leaking, I am debating how much time to spend on finding what the problem is. Time versus money tradeoff.
Wondering if it is a housing o-ring groove tolerance machining issue, or if the pistons are undersized. Who knows without spending a lot of time measuring and investigating all of the possible causes.
Edit: Since 2 of my calipers failed early in their life, and new seals didn't resolve the problem, this indicates to me that it is a housing o-ring groove or piston diameter problem, or a combination of both. (Part machining tolerance stack up?)
jonathanf2:
Are you beyond your return period? I would have just sent them back for a refund. I bought an AliEx crankset awhile back, only to find out months later (when I was about to install it), the chainring screw holes aren't threaded! Now I can't return the crank which is completely useless.
Tijoe:
--- Quote from: jonathanf2 on October 14, 2024, 12:56:12 PM ---Are you beyond your return period? I would have just sent them back for a refund. I bought an AliEx crankset awhile back, only to find out months later (when I was about to install it), the chainring screw holes aren't threaded! Now I can't return the crank which is completely useless.
--- End quote ---
Way past the return period...
2 of my 4 sets are over 1 year old. The third set is about 9 months old. I've had my 4th set for about 3 months, and had to put them in service because of the most recent caliper failure.
I have no way of knowing which brake calipers are on which bike because I often reconfigure my bike's components and swap front forks, or handlebars between bikes. Therefore, all the front calipers are all mixed up between bikes, and to a lesser degree, the rear calipers.
00Garza:
--- Quote from: jonathanf2 on October 14, 2024, 12:56:12 PM ---Are you beyond your return period? I would have just sent them back for a refund. I bought an AliEx crankset awhile back, only to find out months later (when I was about to install it), the chainring screw holes aren't threaded! Now I can't return the crank which is completely useless.
--- End quote ---
Yikes. What crank was that?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version