User guide

Section I - Trouble Shooting & Guidelines • Page 10
PART II - ALL VACUUM UNITS - BLEEDING PROCEDURES
IT IS RECOMMENDED THAT ALL BRAKE BLEEDING BE PERFORMED WITH A
PRESSURE BLEEDER. IF ONE IS NOT AVAILABLE, USE THE FOLLOWING PROCEDURE:
FRAME MOUNTED - 2 LINE UNITS.
DO NOT RUN THE ENGINE WHILE PERFORMING BLEEDING OPERATIONS.
1. Fill the reservoir of the new, rebuilt, or flushed out master cylinder with new, clean, heavy duty
brake fluid.
2. During bleeding check frequently to make certain that fluid in master cylinder resevoir maintains
at least 1/2 inch of fluid. Failure to do so may require starting all over.
3. Pre-bleed master cylinder by loosening tube nut and slowly pump master cylinder until fluid runs
clear. Retighten nut.
4. Bleed power unit as required. Pump pedal slowly to avoid creating air bubbles in fluid. Bleeder
screws should be opened on the pressure stroke of the master cylinder and closed on the
return stroke.
5. Continue around vehicle wheels until all bleeder screws run clear.
6. Refill master cylinder reservoir and slowly pump pedal with no bleeders open. This allows
master cylinder to evacuate any air bubbles that may remain in cylinder bore. Air will escape
through compensating port in the bottom of the reservoir.
7. Start engine and pump pedal two or three times. Then allow time for fluid to return to the reservoir.
If pedal is firm but has excessive stroke, adjust brakes at all wheels. If pedal is “spongy” it still
has air in the hydraulic system. See step 8.
8. Some vehicles may require “serge” bleeding. To accomplish this, have engine running at idle and
make a firm pedal application. Open and close wheel cylinder bleeder screws very quickly.
Do not let the pedal go clear to the floor.
Repeat this step at each wheel. Remember to check brake fluid level in reservoir.
9. Proceed with road test.
FRAME MOUNTED: 3 LINE UNITS. Three line units, (with third line connected to master cylinder
reservoir) can not be properly bled without a pressure bleeder. Set bleeder pressure at 50 to
60 P.S.I. Be sure reservoir on master cylinder is filled above third line connection port, Do not
run engine while bleeding.
FIREWALL MOUNTED (PUSH THROUGH BOOSTERS) ALL MAKES. The bleeding procedure is
essentially the same except that the engine should be running at the very beginning and through
out the entire process (if a pressure bleeder is not used).
SECTION I - TROUBLE SHOOTING & GUIDELINES