Results 1 to 3 of 3
  1. #1
    mtbr member
    Reputation:
    Join Date
    May 2004
    Posts
    136

    Troubleshooting Hope Minis

    I've had a set of original Hope Minis for almost 3 years now. They've been trouble free up until a few months ago. I started having problems where at the beginning of the ride the brake levers were not generating much pressure on the pads, but then after a while pressure would build and everything would work pretty well. This has continued on to this day.

    In the mean time I've replaced the pads twice, first with some EBC pads. But even when the pressure was back on I was getting poor braking performance. So I ordered a set of pads and new resevoir diaphrams from Hope directly. I thought that maybe the pressure problem was due to a leak somewhere, and indeed there was a small leak in the front brake's resevoir diaphragm. So after replacing the pads, and fixing both resevoirs, I bled both the front and rears once again. After bleeding I had good brake lever pressures both front and rear (this was last weekend). I pulled the bike out to ride yesterday morning after it had sat for a week, and sure enough the front brake lever went all the way to the handle bar. So I pumped it up and it built up pressure, and I went for a ride.

    On yesterday's ride even though I had good pressure in the levers, I still had pretty poor braking performance. I realize that I had to wait for the pads to bed in and they eventually did start to build up more friction. But even after they had bedded in I still was having to squeeze the levers much harder than what I consider normal to come to a stop.

    After replacing the pads twice, installing new diaphragms, using the mud treatment on the rotors, and bleeding the brakes at least 4 or 5 times through all this I'm at a loss as to what else could be wrong.

    1. Why am I still having to pump up the brakes before I start my ride?
    2. Why am I having to squeeze so much harder to come to a stop? Currently I am just unable to go on any really challenging rides, because I could quite literally fly off the edge of a cliff like this.

    I've always hung my bike upside down in the garage, could this be contributing to the problems? Is there anything else in the calipers that can wear out that I should be replacing? Do the brake hoses get old and begin to expand maybe? I'm totally at a loss.

    Thanks in advance for any suggestions.

    Derek

  2. #2
    pj.
    pj. is offline
    mtbr member
    Reputation: pj.'s Avatar
    Join Date
    Jun 2004
    Posts
    53

    Sounds like air in the brake system.

    Hanging the bike upside down will move any air in the master cycliner to the caliper.

    Try the following.
    1. Buy brand new DOT 5.1 brake fluid. It needs to be a new and unopened bottle, as brake fluid absorbs water over time.
    2. Take the wheel off, remove the brake pads, push the pistons back, and put something between them to stop them moving (card, or plastic)
    3. Using the two syringe approach, bleed the brake, and completely renew the fluid. Work the fluid back and fore to expel any trapped air.
    4. When refitting the top to the master cylinder ensure no air is left in the master cylinder. Do this by completely filling the cylinder Ė youíll need to hold a rag under the lever, as brake fluid will overflow when you put the rubber in place, and you MUST wash down the bike afterwards with plenty of water.


    Why donít you drop Hope an email, Iíve always found them super helpful.

  3. #3
    mtbr member
    Reputation:
    Join Date
    May 2004
    Posts
    136

    I didn't think about new brake fluid

    Yea the bottle that I have is probably 2 years old. I'm not sure what the two syringe method of bleeding is. I ordered a bleed kit from Hope when I first got the brakes, and that always seemed to do the trick. Is there potentially some problem with using air pressure to force the brake fluid throughout the system?

    Your bleeding suggestions do mention a couple of things I haven't tried. But I'm still gonna have the problem of not generating enough friction at the pads/rotor interface.

    I'll give these things a try.



    Quote Originally Posted by pj.
    Hanging the bike upside down will move any air in the master cycliner to the caliper.

    Try the following.
    1. Buy brand new DOT 5.1 brake fluid. It needs to be a new and unopened bottle, as brake fluid absorbs water over time.
    2. Take the wheel off, remove the brake pads, push the pistons back, and put something between them to stop them moving (card, or plastic)
    3. Using the two syringe approach, bleed the brake, and completely renew the fluid. Work the fluid back and fore to expel any trapped air.
    4. When refitting the top to the master cylinder ensure no air is left in the master cylinder. Do this by completely filling the cylinder Ė youíll need to hold a rag under the lever, as brake fluid will overflow when you put the rubber in place, and you MUST wash down the bike afterwards with plenty of water.


    Why donít you drop Hope an email, Iíve always found them super helpful.

Similar Threads

  1. Replies: 5
    Last Post: 01-10-2005, 07:17 PM
  2. Replies: 0
    Last Post: 10-19-2004, 12:49 PM
  3. questions about hope minis
    By thebikedoctor33 in forum Brake Time
    Replies: 3
    Last Post: 08-22-2004, 08:54 PM
  4. Replies: 1
    Last Post: 06-22-2004, 09:53 AM
  5. Hope Mono Mini's vs. M4's
    By CraterMaker in forum Brake Time
    Replies: 5
    Last Post: 05-30-2004, 02:07 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •