Good couple of weeks just had the verdict that my stuck rear shock wasn’t worth fixing and then went down the garage to sort a minor bit of brake rub and I’m tearing my hair out.

Brake is a Hope Mono M4, the black and gold ones from about 2006.

The pistons on the hub side and the large/leading one especially are sticking luck the proverbial to a blanket.

Double checked the alignment and thats fine and I have tried the holding the piston in thing with no joy.

Brakes feel solid but I haven’t bled them tonight.

I have lubed the pistons with dot5.

What do I try next? I don’t ideally want to fork out for new brakes but this is not the first time I’ve had this issue.

Oh and thanks in advance for any replies and please excuse the typos. Smartphone not the best for this!

my m4’s had sticking piston and i just forced the piston in and out a few times with a massive screwdriver while chucking on some silicone lube

seems to have done the trick

good luck

Andy

Check out this guide I compiled. Should get you going again.

Don’t use a screwdriver on the pistons as you run the risk of cracking them.

thanks. will look at the guide later on.

As 3fish says, that’s the definitive response, and Steve thx I used that page several times.

I was recommended Red Rubber Grease for lubricating the pistons as it does not degrade the seals like some silicone lubes. After a thorough clean with some cotton buds I applied the grease (google search found a supplier) to the pistons and they have been running smoothly ever since.