I need to replace the brake lines on a 2000 silverado. Can't tell wich ones are coming from the master cylinder and witch one go to the front brakes. Three go across the top of abs unit and two on the bottom. The top right goes to the rear wheels. Does anyone know how the other four are routed? Thanks, Bill

Rob Sinbad

• 709 Answers
• Posted on Jul 25, 2009

SOURCE: 1994 Cavalier -replaced master cylinder-no pressure to rear brake

The most common bleeding procedure is to bleed the ABS brake furthest from the master cylinder first, then bleed the other brake that shares the same hydraulic circuit (which may be the other rear brake on a rear-wheel drive car, or the opposite front brake on a front-wheel drive car or minivan). After these have been bled, you then bleed the other brake circuit starting with the furthest brake from the master cylinder.
Air can be very difficult to remove from an ABS modulator assembly because of all the nooks and crannies inside the unit. The modulator may have eight to 10, or more, ABS/traction control solenoid valves, plus various check valves and dead-end ports. Some ABS modulators have special bleed screws to help you vent the trapped air when bleeding the system. Others do not and require the use of a scan tool to cycle the ABS solenoids while you bleed the system. 1. To bleed the isolation valves in the modulator, there are two bleeder screws. Start with the one toward the engine. Turn the ignition on and apply light pressure on the brake pedal. Open the bleeder screw and allow the fluid to flow until clear. Close the screw and do the same at the second bleeder screw. 2. Depressurize the accumulator by pumping the pedal 40 times with the key off. Wait about two minutes for the brake fluid to de-aerate, then refill the fluid reservoir with DOT 3 brake fluid. 3. Now you can bleed the boost section. This is done by applying moderate pressure on the brake pedal and turning the ignition on for three seconds, then off. Repeat this a total of 10 times. Make sure the pedal feels firm when you have finished, and give the car a road test to make sure the brakes are working properly.

SOURCE: No fluid pressure coming out of ABS modulator

you have to get a scanner and perform a function bleed test on abs valve to work air out of valves, some also have push pins under rubber buttons on side that you can manually push to remove air

Roy Funkhouser

• 140 Answers
• Posted on Aug 28, 2009

SOURCE: 00 Chevy Silverado... ABS EBCM diagram help??? Brake line hookups

Hello,
I hope this helps.







Thank You,
Roy

SOURCE: 00 Chevy EHCU HELP

bleed each separately

SOURCE: how do you bleed the abs unit on a 1997 chevrolet truck

start by bleeding the master cylinder bleed the line closest to the fire wall, then proceed to the right rear wheel, left rear wheel, right front wheel, and then the left front wheel.