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I could have sworn someone asked this? Bleeding Brakes

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Old Mar 17, 2002 | 04:45 AM
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Default I could have sworn someone asked this? Bleeding Brakes

Proper Bleeding Technique
Slowly pour fluid into the master cylinder so as not to aerate the fluid.

BLEEDING BRAKES IS NOT DONE WITH PRESSURE, IT IS PURELY A FUNCTION OF MOVING FLUID THROUGH THE SYSTEM. THE OBJECT IS TO DISPLACE AIR, NOT TO SEE HOW FAR FLUID CAN BE SHOT OUT OF THE CALIPER!

Enlist someone who will help you bleed the brakes. Make sure they also read these instructions carefully (so they understand the goal).

For systems which are essentially dry front and rear, start by filling the master cylinder with proper fluid.
Next, at the caliper farthest from the master cylinder attach the clear plastic bleed line to the bleeder and open it, VERY SLOWLY stroke the brake pedal by hand or foot until fluid comes out. Now close the bleeder.
ACTUAL BLEEDING SEQUENCE:
Have your partner very slowly, with modest pressure (approximately 25-30 ft/lbs), stroke the pedal ONE TIME until hydraulic resistance is encountered. Ask your partner to hold at this point with the same modest and even pressure and notify you that he is, “holding.”
Open the bleeder, letting the pedal go to the floor or until it stops using the same modest level of pressure, close the bleeder, notify your partner, “the system is sealed.”
Repeat BLEEDING SEQUENCE (never stroke the pedal more than one time), until all signs of air are purged (no bubbles) from fluid. IMPORTANT NOTE: DO NOT LET THE MASTER CYLINDER RUN DRY, be sure to check fluid level after every third bleeding sequence or sooner if reservoir volume is very small.
Move to the location which is the next furthest from the master cylinder and repeat the procedures previously outlined. Continue until all calipers have been bleed. You are now 75 % complete with the bleeding process.
Now, take a small block of wood or a plastic hammer and carefully tap the calipers to dislodge any additional air bubbles that may be trapped.
Before re-installing wheels and placing the car on the ground, we recommend you carefully wipe clean all caliper surfaces, hose joints and fittings making sure they are all dry and free from seeping. If not, inspect and tighten appropriately. Spray all rotor surfaces with Brake Klean® or a similar product to remove all dirt and oils from your hand that may have been transferred to the rotor during assembly. Also remember to remove the nut which has been holding rotor in place, before attempting to re-install the wheel.

For street use, as with any time you open the brake system, it may be advisable to repeat the bleeding procedure after driving the vehicle for a day, as driving the car may dislodge some additional air bubbles. For competition cars, we recommend repeating this procedure directly after at least the first two sessions the car is on track and at the beginning of each race weekend thereafter.

Even if your pedal is high and firm and additional bleeding is deemed unnecessary, always inspect the calipers, hoses and fittings after the first outing for signs of any fluid seeping and correct immediately.
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