Morning all,
servicing due too the white out,can anyone shed some light on this,
I've just stripped down my brakes,needed a change of adaptor,bleed new pads then found that the pads were very unevenly worn from the sticking pistons,only one fully worked out of the four.
So,after trying too re-align,lube positions with hunters lube with no success decided on taking pistons out where I've found that there is a hole at the back inside of caliper just near to where the rotor sits just off,now truth be told there is minimal rub but not enough to cause this hole,and there is also still black paint,the hole goes from the rear to inside at a peculiar angle??
It's about 2mm across at rear then 1 ,1 1/2mm as it goes inside to where it is well away from where rotor could rub.
Initially you could say it's rotor wear but it s not worn through also the hole where it comes out is well off where the rotor could rub,a<span style="font-size: 0.8rem;">lso looking at where the seals sit the caliper doesn't look 100./' true in shape,</span>
Anyone else had these issues?
I've read some stuff relating too the pistons but not found the 'Hole' problem.
Cheers.
needs a picture as its hard for me to understand what you mean
Best to contact Hope with a photo, they'll know whether it's a fault or wear. Either way you can buy a replacement caliper body and rebuild or they will do it as part of a service for you if you send it in.
Yes,yes I know picture's,I cannot upload tj,sorry
it's the area where the caliper body is closest to rotor,just skims past the inside of caliper body,when you centre your rotors you keep however much distance away from that area,it's actually on the front end of that part of caliper.
It's reet strange as it doesn't do anything,unless they drilled hole in to hang whilst spraying,I very much doubt that though,just very odd place,and I can't imagine anything sharp enough penetrate into the ally like that,I can push a sewing needle through and wiggle around quite easily.
Not got one in front of me to check, but i'd suspect it's probably for machining-access to an internal port.
if its not leaking then don't worry about it?
Possibly coatesy,and yes shall send back for service,as for leaks No,but I don't expect to pay that kind of money too have a fault for whatever reason,I've had and still have Hope brakes on other bikes and never had any problems with pistons sticking and problems bleeding along with holes in caliper bodies.
Thanks for replies,I was just interested if any other E4 owners had come across this.
They aren't painted. It's anodising. If it's still anodised then I can't see how it can be wear. I have seen machined holes in what look like odd places in hope calipers before.
As you say a perculieur angle my bet would be that it's the end of one of the internal fluid ways. As the calipers are machined as one piece they may need to drill hole and then back fill them with a plug to make the brake fluid path ways.
Oh and sticky pistons is a sign of insufficient maintenance I'm afraid. Four piston designs do in my experience suffer worse as if one piston is moving more feely then this one will always move first (making the issue worse).
Yes,agree nixie with the pistons sticking,but coming from one Hope brake to another I didn't think too realise they'd need more tinkering,the techX2 are faultless,as good as fit and forget,lessoned learned I suppose on lack of molicodiling the E4s,good brake when working but have become a ballache to service.
Is it a hole the same as this one (pic of my own rather dirty e4)?
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I always found the rear pistons suffered worst so for this set I've a X2 on the rear to see if that requires less attention.
That's probably where a drill bit went through to create an internal channel between two pistons.
If you've ever fully stripped one of these calipers you can see exactly where the hole goes. It's a by-product from the machining of the fluid ports inside the caliper. CNC machining might be old hat now but I still marvel at the detail in these calipers :o)
usually a hole like that occurs because you are trying to create the feature with a single drilling.
No not quite,hole further to left,goes through other side 3mm further in still.
Cheers nixie very similar.
If I get a chance I'll pop the pads out and see if there is anything else.
Cheers,
I've sent a pic over to you,it's pretty much the same,as you'll see i can push a sewing pin through with room either side,I'd say it's about couple mm at most.
Not got anything from you yet.
So pads out this is the back of the hole I showed above with a bit of paper pushed through. It's a tunnel so could be the same one. Located at the top of the caliper (side with bleed port).
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The only other similar feature is at the bottom edge of the caliper. This one isn't a tunnel, more a small depression. It's in the right of the slit in this picture.
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They are there to assist the drilling of the connecting ports between the two pistons on either side - you can see this below (RHS front)
C'mon, surely there must be some other defect that OP can invoke in order to get his free repair?
Nixie,that's it.Cheers.
otsrd,I don't recall me saying I wanted a free service,read what said originally,'has anyone else had these issues'
Do one your boring.
Thanks guys for your input,will no doubt know more once back.
Otsdr
A little unfair?
The op is simply trying to see if this hole is a normal feature of the caliper is all, not fishing for a free repair....
Apologies then, I must have misunderstood the general tone of the topic.
Excuse the brief hijack but was curious about this comment...
Oh and sticky pistons is a sign of insufficient maintenance I’m afraid.
What maintenance would people say stops sticky pistons?
I had a set of the old black and gold M4s that were sticky piston nuisances but lovely when working. I didn't really maintain them so what should I have been doing to stop them sticking up?