[Closed] Hope Mini biting point question

is it the reach, or the bite point (or both) that's controlled by the tiny, long, allen bolt accessed from the side? Can't recall the name of it, and you need to slacken the lever pivot bolt, but that might help wind the lever?

Very unlikely to be the wrong fluid. Hope have been in this game longer than anyone else. I'd be very surprised if a bike shop made a mistake like that. If they did use mineral oil rather than brake fluid, you'll know soon enough as seals swell and you get nothing at all from the brakes.

Unlikely a bleed will do anything if you get the brakes working, just later in the stroke.

When I've had this in the past, it was cured by a change of seal. It could either be that the caliper seals are letting the pistons slip all the way back or the first seal on the master piston has failed and it's the second seal doing the work.

Is it both levers or just one?

kcal, that fixing only adjusts the lever reach although it could be that the levers are just wound in too far. Wind it all the way out and see how things work.

Nah, it's not the reach adjustment.

Both levers affected, but the one for the back is much worse than the front.

I've been away from the bike for a while so I've forgotten all the maintenance routines but I seem to remember needing to set the callipers in a certain position when you do a bleed - I wondered if that's what went wrong during the refurb.

But a seal failure certainly seems plausible given the age and lack of recent usage.

One thing that I've found having bled many different brakes on various bikes and motorbikes is the importance of getting as much air as possible out of the master cylinder(squeezing the lever quickly and repeatedly, but only far enough to produce a stream of tiny bubbles. When this stops the air has hopefully left the cylinder). The lines can be air free, but an air pocket can sit in the master cylinder which requires compressing before the pistons move.

Push the pistons fully back to squeeze any air out from behind them and rotate the calipers around to dislodge/move any pockets of air.

Check for sticking pistons.

1) Ask Hope, they are great and will help out.

2) Have you tried the rubber band method?

3) Sounds like a seal issue or a dodgy bleed.

I run original Minis. I changed the pistons and caliper seals last year (or maybe 2 years ago) and the seals seem to have perished. Only ever used 5.1 As a result the pistons wouldn't withdraw to get new pads in. Easy enough to replace. I used the old ones, which were in my spares box and they seem fine.

If the bite point is too near the bars try adjusting the lever though.

What's the rubber band method, bwaarp?

I'll do another bleed myself, I think, and check carefully for air bubbles. Then check the seals, before bothering Hope.

First time I've used a bike shop for years, now I remember why it's best to do your own maintenance 🙂

If the bite point is too near the bars try adjusting the lever though.

I've fiddled with the reach - I have big hands so the levers were already set to max. reach. And the bite point is not just close to the bars, the lever is practically touching the bar before I get any bite. On a long descent, on a hot day, I know I will have no back brake at all.

Sounds to me like it could be one of several issues or a combination.,

Poor bleed leaving air int eh brake
sticky pistons
Callipers not centralised properly

Hope have useful videos on their site.

I would rebleed - its very simple, I would check all pistons movinfg properly and lube them with dot fluid

However - given a shop did this perhpas you should take the brakes back to them and get them to do it correctly? I do wonder if they have used an innapropriate lube on the pistons and damaged the seals

I would centralise as in the hope video

Poor bleed leaving air int eh brake
sticky pistons
Callipers not centralised properly
I do wonder if they have used an innapropriate lube on the pistons and damaged the seals

All of this bothers me too - just feels like a sloppy job. I've had a chat with the mechanic, he wants to take a look. But did they not check it before it left the shop? (Yeah, I noticed as soon as I wheeled it out the door, and I should have said, but I was in a hurry so just rolled my eyes and thought 'last time I ask someone else to fiddle with my bits for money').

I'm more of an own-bits self-fiddler, TBH.

… I suspect a poorly rolled diaphragm. Seems like the easiest thing to accidentally not take care over if it's not your bike and your tea's going cold.

Elastic band to hold lever on tight overnight. Drives air to cylinder. Top up cylinder.

What's the rubber band method, bwaarp

This

Elastic band to hold lever on tight overnight. Drives air to cylinder. Top up cylinder.

Also, you should open the master cylinder top cap with the elastic band still pulling the lever back. Taking it off before removing the top cap is a common mistake. Then remove band and top up fluid. The band has to hold the lever REALLY tight, full braking braking force.

Made a difference for me.

band has to hold the lever REALLY tight, full braking braking force