YUHUAN UNITED MOTOR VEHICLE PARTS CO. LTD FIRST-CLASS SAFETY ALL THE WAY AAPEX SHOW 2008 BOOTH NO.9751 NOV 4-6th

RELIABLE OEM SUPPLIER for FOTON DFM/DFAC MITSUBISHI CHANGFENG

• HOME
• ABOUT US
• PRODUCTS
• SUPPORT
• CONTACT US

Bleeding your brake system

Back to Support/Techonology support

TITLE:BLEEDING YOUR BRAKE SYSTEM

• Purpose

The purpose of bleeding is extremely important to the overall effectiveness of the brake system. Bleeding removes any air that may get trapped in the hydraulic system which could otherwise result in a "spongy" brake pedal and reduce brake effectiveness.

• Preparation




This process requires two people. Make sure you have read the instructions through and have an assistant ready before you start.

Check that you have the following tools available.
<a> Spanner to fit the brake caliper bleed screw
<b> Length of clear plastic tube which will press fit over the bleed screw nipple
<c> Clear container to catch the old fluid
You will also need to ensure that you have sufficient new brake fluid on hand and that it is compatible with the existing fluid.Jack up the vehicle so that you can safely remove all four wheels and gain access to the brake caliper bleeder screws. Ensure that the workspace is clean and that you have the tools necessary to do the job .

• Process




The order in which the brake calipers are bled is important and will depend on how the brake system has been connected. The following diagrams indicate the correct bleed sequence options.Front wheel drive vehicles use a diagonal split brake system whereas most rear wheel drive vehicles use a vertical split system.
Note: During the bleed procedure it is extremely important to ensure that at no time does the master cylinder reservoir become drained of brake fluid. Failure to do so could result in air becoming trapped in the master cylinder.
Before commencing the bleed ensure that all calipers have been fitted so that the bleed screws are located at the topmost position of the installation.


• Steps


1. Place one end of a piece of clear silicon hose with an inside diameter of 6mm over the bleed screw of the caliper.
2. Place the other end into an empty bottle suitable for catching the excess brake fluid.
3. Person 1 undoes the bleed screw half a turn to allow the free flow of brake fluid.
4. Person 2 applies the brake pedal and holds it in the down position.
5. Person 1 shuts off the bleed screw.
6. Person 2 allows the brake pedal to return to the rest position.
7. Repeat steps 3 through 6 watching the flow of brake fluid through the tube each time. When the flow of fluid contains no air bubbles, close off the bleed screw, remove the clear tube and move to the next caliper.
8. After completing each caliper check the fluid level in the brake master cylinder reservoir and top up as required to the level mark. If at any stage the reservoir runs out of fluid, fill the reservoir with fluid to the level mark and then return to the last caliper bled and re-bleed until the fluid is free of air. Then continue bleeding each caliper in sequence until all calipers are done.