Question about Shimano Saint Hydraulic Mountain Bike Disc Brake Levers

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Bleeding hydraulic brake systems

I need to find out how to bleed hydraulic brake systems on mountain bikes so as to be able to service and maintain my own on the move

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Hello there;
you should be able to bleed the brakes just like a car brake system with the bleeder valve on the barake caliper make sure the reservoir is full before you start the proses and use the brake lever to pump pressure into caliper and crack the bleeder valve until you get all the air out of the lines you may have to repeat couple of times to ensure proper brake pressure

Posted on May 29, 2010

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Posted on Jan 02, 2017

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I have an 01 GMC Jimmy 4.3L 4WD & we are trying to bleed the brakes but the scanner says my vehicle is going 3MPH so we manually bleed the brakes but the pedals still easily is pushed to the floor.


Bad master cylinder . What are you using a scan tool for ? No need Unless your Installing a new Electro-Hydraulic Control Unit (EHCU) or new Brake Pressure Modulator Valve (BPMV).
Hydraulic Brake System Bleeding (Manual)
Caution: Refer to Brake Fluid Irritant Caution in the Preface section.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.
Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve.
If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps:
3.1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add GM approved brake fluid from a clean, sealed brake fluid container. Refer to Fluid and Lubricant Recommendations.
If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal.
3.2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder.
3.3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder.
3.4. Reconnect the brake pipe to the master cylinder port and tighten securely.
3.5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
3.6. Loosen the same brake pipe to purge air from the open port of the master cylinder.
3.7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
3.8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder.
3.9. With the front brake pipe installed securely to the master cylinder, after all air has been purged from the front port of the master cylinder, loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8.
3.10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened.
Fill the brake master cylinder reservoir with GM approved brake fluid from a clean, sealed brake fluid container. Ensure that the brake master cylinder reservoir remains at least half-full during this bleeding procedure. Add fluid as needed to maintain the proper level.
Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve.
Submerge the open end of the transparent hose into a transparent container partially filled with GM approved brake fluid from a clean, sealed brake fluid container.
Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
Tighten the bleeder valve, then have the assistant slowly release the brake pedal.
Wait 15 seconds, then repeat steps 8-10 until all air is purged from the same wheel hydraulic circuit.
With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right rear hydraulic circuit install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air purged from the left rear hydraulic circuit, install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right front hydraulic circuit, install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened.
Fill the brake master cylinder reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container.
Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
If the brake pedal feels spongy, repeat the bleeding procedure again. If the brake pedal still feels spongy after repeating the bleeding procedure, perform the following steps:
21.1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection.
21.2. Pressure bleed the hydraulic brake system in order to purge any air that may still be trapped in the system.
Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes

Feb 26, 2017 | GMC Cars & Trucks

1 Answer

Replaced everything in brake system including brake booster,calipers, pads, rotars still won't come to a complete stop It "coasts". To a stop no matter how hard I press on the brake.


Does it feel spongy when you press on pedal ? Sounds a lot like air in the hydraulic lines. Bleed the entire system again and check for leaks in all the lines. Maybe the bleed screws are loose.

Oct 05, 2016 | 1998 Mercury Mountaineer

1 Answer

How to bleed brakes


You'll need a bleed kit and the appropriate brake fluid. Here's a video:

Mar 31, 2014 | Mongoose 2008 Teocali Comp Mountain Bike

1 Answer

Do you bleed dual control brakes the same as regular hydraulic disc brakes?


only if you have a resevoir with that fluid in it there should be a bleeder valve in the caliper

May 01, 2012 | Shimano Xtr Mountain Bike Dual Control...

1 Answer

Clutch lever feels like its disconnected,


I will bet your bike has a hydraulic clutch and there is air in the hydraulic line. Bleed the air the same way as bleeding hydraulic brakes. If you bike has a master cylinder AND a slave cylinder, bleed the master cylinder first.

Jul 01, 2011 | Yamaha FJR 1300 Motorcycles

1 Answer

My brakes leak fluid pretty sure at the brake lever end.They're about 5 yrs old but hardly used.Is there a servicing kit i can buy o rings and so on?


I will assume you have the hydraulic brakes and that is the fluid you are referring too.

If you have never done any hydraulic maintenance you will need a number of parts and tools to fix a leak, especially at the lever. The best solution would be too drop the bike off with your local mechanic/ bike shop and have them properly fix the system. After 5 years your lines and seals are most likely cracking and you need to replace the housing and seals at minimum + rebleed the brakes with the proper oil. Either way to tell you exactly what parts you need someone needs to see the bike. Take it into the shop as suggested already so they can at least tell you which seal kit and which bleed kit you need as well as the proper oil. you will need to buy all this from the shop anyway, ask them the cost difference between buying the parts and kits to do yourself and them doing the work for you.

Apr 16, 2011 | Shimano Xtr Mountain Bike Dual Control...

1 Answer

What are the proper steps to bleeding your brakes on a 1990 vw golf deisel


For left hand drive vehicles: (If the car does not have ABS system you do not need any diagnostic equipment!)

IMPORTANT NOTE: You need using diagnostic equipment connected to the data link connector of the car in order to bleed the ABS block. Follow instructions by scantool equipment for bleeding the ABS block.


1. This bleeding procedure requires two people. Remove the brake system reservoir cap, and fill up with new brake fluid until "MAX" level is reached.
2. Lift the car, or use a channel for access under vehicle.
3. Put the gearbox in "N" - Neutral position, or in "P" - Parking position for automatic transmission.
4. Start the engine and push the brake pedal firmly for 4 - 5 times to the floor, and maintain the brake pedal pushed to the floor.
5. Begin with the rear right wheel. Another person remove the dust cap and loose the brake caliper bleeding screw until the brake pedal goes to the floor. At this moment maintain the brake pedal pushed to the floor, engine idling, and tight the brake caliper bleeding screw. Use a plastic hose: one end connected to the brake caliper bleeding screw, and another end inside a recovery bottle for used brake fluid.
6. Repeat steps no.#4 and no.#5 until no air flows through the brake caliper bleeding screw. Tight the brake caliper bleeding screw, and put the dust cap in their place.

IMPORTANT NOTE: All the time check the brake fluid level in the brake system reservoir, and fill up if necessary!

7. Push the brake pedal firmly for 4 - 5 times to the floor, and maintain the brake pedal pushed to the floor, engine idling.
8. Continue with the rear left wheel. Another person remove the dust cap and loose the brake caliper bleeding screw until the brake pedal goes to the floor. At this moment maintain the brake pedal pushed to the floor, engine idling, and tight the brake caliper bleeding screw. Use a plastic hose: one end connected to the brake caliper bleeding screw, and another end inside a recovery bottle for used brake fluid.
9. Repeat steps no.#7 and no.#8 until no air flows through the brake caliper bleeding screw. Tight the brake caliper bleeding screw, and put the dust cap in their place.

IMPORTANT NOTE: All the time check the brake fluid level in the brake system reservoir, and fill up if necessary!

10. Push the brake pedal firmly for 4 - 5 times to the floor, and maintain the brake pedal pushed to the floor, engine idling.
11. Continue with the front right wheel. Another person remove the dust cap and loose the brake caliper bleeding screw until the brake pedal goes to the floor. At this moment maintain the brake pedal pushed to the floor, engine idling, and tight the brake caliper bleeding screw. Use a plastic hose: one end connected to the brake caliper bleeding screw, and another end inside a recovery bottle for used brake fluid.
12. Repeat steps no.#10 and no.#11 until no air flows through the brake caliper bleeding screw. Tight the brake caliper bleeding screw, and put the dust cap in their place.

IMPORTANT NOTE: All the time check the brake fluid level in the brake system reservoir, and fill up if necessary!

13. Push the brake pedal firmly for 4 - 5 times to the floor, and maintain the brake pedal pushed to the floor, engine idling.
14. Continue with the front left wheel. Another person remove the dust cap and loose the brake caliper bleeding screw until the brake pedal goes to the floor. At this moment maintain the brake pedal pushed to the floor, engine idling, and tight the brake caliper bleeding screw. Use a plastic hose: one end connected to the brake caliper bleeding screw, and another end inside a recovery bottle for used brake fluid.
15. Repeat steps no.#13 and no.#14 until no air flows through the brake caliper bleeding screw. Tight the brake caliper bleeding screw, and put the dust cap in their place.
16. Now the brakes are bleeded. Check the brake fluid level in the reservoir. Fill up with new brake fluid until "MAX" level is reached. Put back the brake reservoir cap.
17. Test the car brake system. The brake pedal movement no more than 1/3 of total stroke until the floor, when brake pedal is applied. Maximum admissible is 1/2 of total stroke.

Dec 06, 2010 | Volkswagen Golf Cars & Trucks

1 Answer

How to bleed the brakes


Bleeding the ABS System

Print


NOTE
This procedure requires the use of a scan tool.


NOTE
Performing the SYSTEM BLEED FUNCTION on the diagnostic tool drives trapped air from the hydraulic control unit (HCU). Subsequent bleeding removes the air from the brake hydraulic system to the bleeder screws.


NOTE
The engine must be running to provide adequate voltage to the HCU module during the anti-lock control portion of the system bleed.

1. Connect the diagnostic tool.

2. Start the engine and depress the brake pedal to half of the full travel position.

3. Access FUNCTION TEST mode and press the trigger to run the SYSTEM BLEED FUNCTION.

4. Manually bleed the brake hydraulic system.

5. Repeat the procedure performing a total of two diagnostic tool cycles and two manual bleed cycles. The bleed procedure is complete.


Hope helps.

Nov 01, 2010 | Ford Laser Cars & Trucks

1 Answer

My clutch is not angaging need to see how can i bleed


Hydraulic Clutch System BLEEDING The clutch system can be bled using a pressure bleeder. Follow the instructions that come with the pressure bleeder for the proper pressure bleeding procedure. The maximum line pressure while pressure bleeding must not exceed 36 psi (248 kPa). NOTE: To bleed a clutch manually requires the assistance of a second person, a section of hose that is compatible with brake fluid (preferably clear) and fits the slave cylinder bleed screw snugly and a container to catch the fluid that is bled through the system. As brake hydraulic fluid easily absorbs moisture, always use fresh fluid when bleeding a hydraulic system.
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. To bleed the system perform the following:
    1. Top off the hydraulic fluid reservoir using a fluid that meets the standards of the vehicle's hydraulic system.
    2. Open the clutch slave cylinder bleed screw and press the clutch pedal to the floor and hold the pedal down.
    3. Close the clutch slave cylinder bleed screw.
    4. Release the clutch pedal.
    5. Check the hydraulic fluid level and top off as necessary.
  3. Repeat the above steps until the discharged fluid is clean and no air bubbles appear during the bleeding process.
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Aug 03, 2010 | 1998 Audi A4

1 Answer

How to best insert new break fluid and bleed the line


Depending on which brand of brakes you have on your bike, you will need a brake bleeding kit specific to those brakes. Some of the fittings in the kit are such that you can't make them or obtain them elsewhere easily. There are various fluids used also. Some brakes use mineral oil and some brake fluid vary in density from DOT 3 to 5.1. This is something that is more easily done with a helper and the right tools. A good bicycle shop can do this at a nominal fee or they can sell or order you what you will need.

Apr 24, 2009 | Specialized Bicycle Components Specialized...

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