Singletrack Mountain Bike Magazine

1. rich-6 - Member

   As above really the hope calipers with the black/ gold bore caps on them.

   I've just bought some M4s and these were in the box with them the floating ones, Ive lined the calipers up central to the disk, stuck the pads back in and pumped the lever, and they seem to be catching and after a few pumps of the lever are practically locked on!

   I've given the pistons a clean while in situ too to make sure none are sticking and they arent.

   Dont feel too good after this as i lost ones of the tri-align conical washers off my carbons and have had to bodge them up with washers for scotland next week boo, Unless i can get the hopes working

   So is it new disk time? I cant sem to recall having a problem before like this with any of my previous hopes

   Posted 8 months ago #
2. TandemJeremy - Member

   shouldn't be the disc - they are all the same thickness I thought. sounds like sticky pistons to me. Can you see where it is catching?

   Posted 8 months ago #
3. rich-6 - Member

   Yeah both pads are in full contact like when you pull the lever, I did a quick bleed to make sure they werent overfull too

   With the pads out all the pistons move out together, I put a screwdriver on the backplate of the pads and pushed the pistons in like hope showed on and old MBUK DVD then i've pulled the lever a few times to make sure all was free

   The rotors say mono 6 on them is that an issue or are all 183mm rotors mono 6?

   Posted 8 months ago #
4. TandemJeremy - Member

   There are different widths of the braking track but I think thats the only difference.

   Deffo sticky pistons - work 'em in and out a few times with some break fluid on them to wet the seals - or red rubber grease if you can get some

   Posted 8 months ago #
5. rich-6 - Member

   I'l give it another bash tomorrow and see what comes of it, If the pistons were sticky they wouldnt all move out together with the pads out would they?

   Posted 8 months ago #
6. UK-FLATLANDER - Member

   I believe the older rotors were 180mm not 183, that might be the issue

   Posted 8 months ago #
7. pinches - Member

   i ran a 203mm saw floating rotor in a number 8 old style mono M4 for over a year with no probs

   Posted 8 months ago #
8. TandemJeremy - Member

   If the rotor was oversize it would lock up all the time not just after pumpin the lever?

   Posted 8 months ago #
9. Mugboo - Member

   When i put my M4's (06) on my 36 post mount forks with a floating saw rotor i had to put a washer between the mount and the hope brake adapter to give me the clearance i needed. So check its not catching on the caliper body.

   Posted 8 months ago #
10. catfood - Member

    As flatlander says the new saw tooth rotors are 183mm not 180mm which may be your problem, Hope will make you a 180mm if you ask tho, they did for me, took about a week.

    Posted 8 months ago #
11. pinches - Member

    if they are the post mount type, not the IS type, you can use a small washer between the post mount/adaptor and the caliper, as the calipers get stuck on the rivets that hold the floaters together

    Posted 8 months ago #
12. Rockhopper - Member

    3mm on the diameter of the rotor won't make the slightest bit of difference in the case.

    Posted 8 months ago #
13. unklebuck - Member

    Sounds like a sticking piston to me, TJ's method above should work but may have to almost pump the pistons out of the caliper a few dozen times to get them moving properly.

    Are the pads new, I always seem to get this more when the pads are thicker?

    Also, CRC and UKBikeStore both sell the saw rotors in the older sizes as well as the +3mm ones for the newer models.

    Posted 8 months ago #
14. superdale - Member

    Rich if the rotors say 'mono 6' then they are for the Mono6 DH caliper only and will not work with the Mini or M4 caliper. This is as the rotor is slightly thicker and will not run between the pads as you are experiencing. You will need to swap them for some Mini/M4 Saw rotors instead sorry.

    Posted 8 months ago #
15. tinsy - Member

    Nah had a mono 6 200 and something on my black and gold M4's no problem, disc is the same thickness, just a slightly different depth of braking surface.

    Posted 8 months ago #
16. superdale - Member

    It could also be the disc brake pads you are using. The Hopes backing plate is quite thin but some other manufacturers use a thicker metal which causes this problem with new pads fitted. Had a similar problem with Formulas until i reverted to the OE pads. Check with Hope about the rotor issue though or compare it with another disc?

    Posted 8 months ago #
17. rich-6 - Member

    Just got back to this, The rotor has been catching on the caliper body it would seem, its only slight but its caught, I think i'm going to end up on the phone to hope to get a slightly smaller one made.

    They have hope pads in them too so these have a thinner backplate than most?? theyy arent new but have done the most smallest amount of miles looking at them theres no wear

    Posted 8 months ago #

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