Question about Shimano Xt Hydraulic Mountain Bike Brake Levers (set)

2 Answers

Got a pair of shimano xt 775 pre-bled hydraulic brakes from e-bay. The hose length turned out to be too short, so I installed new longer hydraulic hose to both front and back. I went through the shimano bleed instructions (sevral times), but I still can't get a nice stiff lever feel on the back brake. Lever is very soft feeling and doesn't engage until it is almost at the bar. Any suggestions?

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  • Master
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There is still air in the line. First thing I do is squeeze the brake lever and check for leaks where the hose connects at the lever and the caliper. Second, I check to make sure the hose connecting bolts are torqued to spec. If they are too loose, they may not have engaged the olive completely and could be letting air into the system. Assuming those two things check out, it's back to bleeding the brakes again. On dry systems, where all the fluid has been drained, I find that bleeding several times usually does the trick if the first one doesn't do it.

Posted on Aug 20, 2017

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You'd be much better off going to a bicycle-specific site. I recommend http://www.bikeforums.net/bicycle-mechanics

Posted on Aug 12, 2017

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Posted on Jan 02, 2017

dunnbiker
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SOURCE: My shimano brake mr 486 lever touches the

Shimano's site doesn't show an MR486. Perhaps YOU could find something that matches your levers.

http://techdocs.shimano.com/techdocs/index.jsp?bmUID=iRuGBXS

You can't make up for air or low oil in a hydraulic system by just tweaking the lever.

Posted on Jan 12, 2011

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1 Answer

How to bleed clutch 2007 compass


GRAVITY BLEEDING CLUTCH HYDRAULIC CIRCUIT

1. Verify fluid level in brake master cylinder. Top off with DOT 3 brake fluid as necessary. Leave cap off.

2. Raise vehicle on hoist.

3. Remove bleed port protective cap and install suitable size and length of clear hose (4) to monitor and divert fluid into suitable container.

4. Open up the bleed circuit by turning the thumb screw (3) counter clockwise this will start the air purge and fluid fill process.

5. Lower vehicle, but only enough to gain access to and fill the brake master cylinder. NOTE: Do not allow clutch master cylinder to run dry while fluid exits bleed port.

6. Top off brake master cylinder fluid level while air is purged and fluid drains from bleed port. Continue this until no air bubbles are seen and a solid column of fluid exists.

7. Close hydraulic bleed circuit, remove drain hose and replace dust cap on bleed port.

8. From driver's seat, actuate clutch pedal 60-100 times.

9. Apply parking brake. Start engine and verify clutch operation and pedal feel. If pedal feels fine and clutch operates as designed, stop here. If pedal still feels spongy or clutch does not fully disengage, excessive air is still trapped within the system, most likely at the master cylinder.

10. Top off brake master cylinder fluid level with DOT 3 brake fluid as necessary.

POWER BLEEDING CLUTCH HYDRAULIC CIRCUIT

1. Remove reservoir cap and connect bleeder cap to reservoir. NOTE: Use Bleeder Cap/Modified reservoir cap adapter Snap-on #901-059 or equivalent.

2. Connect service filling machine to bleeder cap. NOTE: Use Service Filling Machine/Brake power bleeder Brake power bleeder or equivalent.

3. Service filling machine should be pressurized to at least 2.5 bar (36 PSI).

4. Remove dust cap from bleeder valve and connect the transparent bleeder hose to bleeder valve.

5. Place the other end of hose in the bleeder container to capture the used fluid. The end of the hose MUST be submerged in the DOT 3 brake fluid.

NOTE: Use Bleeder Container To capture hydraulic fluid and Transparent Bleeder Hose To route fluid to container.

6. Turn on the service filling machine.

7. Crack open the bleeder valve (3).

8. Allow fluid to flow out of bleed port until no more air bubbles can be seen in the transparent bleeder hose.

9. Once fluid is free of air bubbles; make 15 quick actuations between clutch pedal stop positions.

10. Close the bleeder valve and disconnect the service filling machine.

11. To remove remaining air, actuate pedal 10 times slowly between pedal stop positions.

12. Check clutch pedal to see if vehicle is properly bled.

13. If vehicle is not properly bled, repeat procedure.

14. Remove bleeder cap from reservoir and replace reservoir cap.

15. Disconnect transparent bleeder hose from bleeder valve and replace dust cap.

Oct 15, 2013 | 2007 Jeep Compass Limited

1 Answer

How do I bleed brakes on a dodge stratus 1998


  • PRESSURE BLEEDING
  • MANUAL BLEEDING
  • Print
    For vehicles equipped with an Anti-lock Brake System (ABS), please refer to the ABS bleeding procedure at the end of this section.
    The purpose of bleeding the brakes is to expel air trapped in the hydraulic system. The system must be bled whenever the pedal feels spongy, indicating that compressible air has entered the system. It must also be bled whenever the system has been opened or repaired. If you are not using a pressure bleeder, you will need a helper for this job.

    WARNING Never reuse brake fluid which has been bled from the brake system.


    MASTER CYLINDER

    See Figure 1
    If the master cylinder is off the vehicle, it can be bench bled.

    1. Secure the master cylinder in a bench vise.
    2. Connect 2 short pieces of brake line to the outlet fittings, bend them until the free end is below the fluid level in the master cylinder reservoirs.
    3. Fill the reservoir with fresh DOT 3 type brake fluid.
    4. Using a wooden dowel, or equivalent, pump the piston slowly several times until no more air bubbles appear in the reservoirs.



    0900c15280089cdc.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Fig. 1: Attach bleeding tubes to the master cylinder and position them as shown

    1. Disconnect the 2 short lines, refill the master cylinder and securely install the cylinder cap.
    2. If the master cylinder is on the vehicle, it can still be bled, using a flare nut wrench.
    3. Open the brake lines slightly with the flare nut wrench, while pressure is applied to the brake pedal by a helper inside the vehicle.
    4. Be sure to tighten the line before the brake pedal is released.
    5. Repeat the process with both lines until no air bubbles come out.
    6. Bleed the complete brake system, if necessary.

    If the master cylinder has been thoroughly bled and filled to the proper level upon installation into the vehicle, it is not necessary to bleed the entire hydraulic system.


    PRESSURE BLEEDING

    When bleeding the brakes, air may be trapped in the brake lines or valves far upstream, as much as 10 feet from the bleeder screw. Therefore, it is very important to have a fast flow of a large volume of brake fluid when bleeding the brakes, to make sure all of the air is expelled from the system.
    On Cirrus, Stratus, Sebring convertible and Breeze models, the following wheel sequence should be used to ensure that all the air is removed from the system:


    Left rear wheel Right front wheel Right rear wheel Left front wheel
    On Sebring coupe and Avenger models, the following wheel sequence should be used to ensure that all the air is removed from the system:


    Right rear wheel Left front wheel Left rear wheel Right front wheel

    1. You should use bleeder tank tool C-3496-B or equivalent, with the required adapter for the master cylinder reservoir to pressurize the hydraulic system for bleeding. Make sure to follow the manufacturer's directions for using a pressure bleeder.
    2. Attach a clear plastic hose to the bleeder screw located at the right rear wheel, then place the hose into a clean jar that has enough fresh brake fluid to submerge the end of the hose.
    3. Open the bleeder screw at least one full turn or more to get a steady stream of fluid.
    4. After about 4-8 oz. of fluid has been bled through the brake system and an air-free flow is maintained in the hose and jar, close the bleeder screw.
    5. Repeat the procedure at all the other remaining bleeder screws. Then, check the pedal for travel. If pedal travel is excessive or has not improved, enough fluid has not passed through the system to expel all of the trapped air. Be sure to monitor the fluid level in the pressure bleeder. It must stay at the proper level so air will not be allowed to re-enter the brake system through the master cylinder reservoir.
    6. Once the bleeding procedure is complete, remove the pressure bleeding equipment from the master cylinder.


    MANUAL BLEEDING

    See Figure 2
    Proper manual bleeding of the hydraulic brake system will require the use of an assistant.
    On Cirrus, Stratus, Sebring convertible and Breeze models, the following wheel sequence should be used to ensure that all the air is removed from the system:


    Left rear wheel Right front wheel Right rear wheel Left front wheel
    On Sebring coupe and Avenger models, the following wheel sequence should be used to ensure that all the air is removed from the system:


    Right rear wheel Left front wheel Left rear wheel Right front wheel


    0900c15280089cdd.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Fig. 2: With a clear plastic hose in a container of clean brake fluid, open the bleeder screw at least one full turn

    1. Attach a clear plastic hose to the bleeder screw located at the right rear wheel, then place the hose into a clean jar that has enough fresh brake fluid to submerge the end of the hose.
    2. Have an assistant pump the brake pedal 3-4 times, and hold it down before the bleeder screw is opened.
    3. Open the bleeder screw at least one full turn. When the bleeder screw opens, the brake pedal will drop.
    4. Close the bleeder screw. Release the brake pedal only AFTER the bleeder screw is closed.
    5. Repeat the procedure 4 or 5 times at each bleeder screw, then check the pedal for travel. If the pedal travel is not excessive, or has not been improved, enough fluid has not passed through the system to expel all of the trapped air. Make sure to watch the fluid level in the master cylinder reservoir. It must stay at the proper level so air will not re-enter the brake system.
    6. Test drive the vehicle to be sure the brakes are operating correctly and that the pedal is solid.

    May 31, 2012 | 1998 Dodge Stratus

    1 Answer

    I am having problems adjusting a pair of Shimano XT center-pull cantilever brakes. Do you know where I can get a manual for these?


    www.shimano.com has detailed basic manuals for all their components.

    What are you having problems with adjusting?

    Tips:

    On the side of the cantilevers there is a tiny 2mm set screw, these adjust tension and will help to balance the two brakes for centering.

    Make sure the cable assembly is centered over the brakes.

    Pads - if you can't get them to stay in place you may have to replace the conical washers or the pads or both.

    Dec 06, 2010 | Shimano Cycling

    1 Answer

    How do i bleed the brakes on a 1999 Pontiac Grand Am?


    Bleeding the Brake System
    When any part of the hydraulic system has been disconnected for repair or
    replacement, air may get into the lines and cause spongy pedal action (because
    air can be compressed and brake fluid cannot). To correct this condition, it is
    necessary to bleed the hydraulic system so to be sure all air is purged.

    When bleeding the brake system, bleed one brake cylinder at a time, beginning
    at the cylinder with the longest hydraulic line (farthest from the master
    cylinder) first. ALWAYS Keep the master cylinder reservoir filled with brake
    fluid during the bleeding operation. Never use brake fluid that has been drained
    from the hydraulic system, no matter how clean it is.

    The primary and secondary hydraulic brake systems are separate and are bled
    independently. During the bleeding operation, do not allow the reservoir to run
    dry. Keep the master cylinder reservoir filled with brake fluid.


    1. Clean all dirt from around the master cylinder fill cap, remove the cap and
      fill the master cylinder with brake fluid until the level is within 1/4 I n.
      (6mm) of the top edge of the reservoir.
    2. Clean the bleeder screws at all 4 wheels. The bleeder screws are located on
      the top of the brake calipers.
    3. Attach a length of rubber hose over the bleeder screw and place the other
      end of the hose in a glass jar, submerged in brake fluid.
    4. Starting at the right rear proceed in this order left front, left rear and
      right front.
    5. Open the bleeder screw 1/2 - 3/4 turn. Have an assistant slowly depress the
      brake pedal.
    6. Close the bleeder screw and tell your assistant to allow the brake pedal to
      return slowly. Continue this process to purge all air from the system.
    7. When bubbles cease to appear at the end of the bleeder hose, close the
      bleeder screw and remove the hose.
    8. Check the master cylinder fluid level and add fluid accordingly. Do this
      after bleeding each wheel.
    9. Fill the master cylinder reservoir to the proper level.


    prev.gif next.gif

    Sep 21, 2010 | 1999 Pontiac Grand Am GT

    1 Answer

    2001 alero put new master cylender bake hose and lining and still have no brakes


    Did you bench bleed the master cylinder? If there is still air in the cylinder or lines, it will compress when you hit the pedal, instead of transferring hydraulic pressure to the brakes. Even if you bled each of the lines after installing them, air could still be trapped in the cylinder itself...

    Aug 10, 2009 | 2004 Oldsmobile Alero

    1 Answer

    How do i cut my shimano xtr hydraulic hoses to size?


    You need spare olives (the brass ones are best) buy on Chainreactioncycles.com, measure your hose and allow for bad cut first time so add a Cm to measurement you can cut away just make sure that you use really sharp cutter (I use craftknife) place hose on non slip surface and cut cleanly, push on olive and reattach and tighten

    Mar 19, 2009 | Shimano Xtr Mountain Bike Dual Control...

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