Hope saw rotors compatible with older M4s?

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Hope saw rotors compatible with older M4s?

17 posts & 10 voices | Started 2 years ago by rich-6 | Latest reply from rich-6

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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 2 years ago #
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 2 years ago #
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 2 years ago #
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 2 years ago #
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 2 years ago #
UK-FLATLANDER - Member

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

Posted 2 years ago #
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 2 years ago #
TandemJeremy - Member

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

Posted 2 years ago #
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 2 years ago #
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 2 years ago #
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 2 years ago #
Rockhopper - Member

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

Posted 2 years ago #
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 2 years ago #
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 2 years ago #
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 2 years ago #
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 2 years ago #
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 2 years ago #

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