Question about 1999 Chevrolet Silverado 1500
I replaced all the lines on the hcu i cant get sys to bleed i don't know if i got one of the lines crossed. i put master cyl front in top left of hcu master cyl right then rear on the bottom i put right front then left front and i can't get it to bleed.do i have a line crossed?
Posted by Anonymous on
The ABS unit should have the connection IDs embossed into the casting at every line connection.You are going to HAVE TO determine every connection line going to every component to make this work.
Posted on Mar 21, 2018
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Posted on Jan 02, 2017
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.
Posted on Jul 25, 2009
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.
Posted on Sep 16, 2009
Why were the brake lines replaced?
Sounds like the mastercylinder may have run dry. You have to bench bleed the master and then DO NOT allow fluid to run low, while bleeding brakes...
if master cylinder runs low on fluid and air gets in, almost impossible to bleed with out releasing the lines and bleed master it self.
Posted on Sep 20, 2009
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