Question about 2001 GMC Sonoma Extended Cab

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I have a 2001 gmc sonoma 4.3 replace brake lines on back i am not getting any fluid to rear wheels i tryed bleeding sys with help diconected abs sys to reset to defalt no abs light is on stumped

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A special tool is required to hold the ABS hydraulic control unit popit valves open during bleeding of the brakes, without this special tool you will not be able to get the air out of the system, most good brake shops have this tool or of course the local Chevy dealer or GMC dealer. I am a dealer tech and know this information is correct..

Posted on May 12, 2010

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Line broke was leaking fluid then stopped leaking . no fluid comes out of abs unit on frame. is there a way to reset the abs unit to get fluid to rear brakes again


Replace the broken line then, you must bleed the entire brake system , each wheel works by itself on these cars, . Put the rearend in the air get the tires off and then find where the lines go into the ABS unit. Bleed fliud there first, then the individual wheel cylinders in the rear. after you bleed the system, check to make sure the brake system is balanced.

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I replaced the mst cyl. how do I bleed the ABS sys to get the air out? 97 ford F-150


You bleed it like you would a normal system but you must use the boost assist to do it, in order to do this start the truck pump the brakes three times and bleed that cylinder farthest away from the master cylinder do this twice or until you get clear fluid to run out. add fluid for every cylinder before moving on. Do this for each wheel and after doing all four wheels you should be ready to go. If it feels mushy you will have to bleed it a second time. But you must have the engine running to bleed the brakes unless you have a power bleeder. You may want to bleed the master cylinder first to do this add fluid to the cylinder then pump brakes three times crack the front line open and allow it to bleed air rout of the line do the same for the rear master cylinder once yo get solid fluid from the master cylinder you can dot the same for the ABS then do the wheel cylinders and wheel calipers. This needs to be done sometimes, be sure to never let the master cylinder run out of fluid and check it each time you bleed the wheel cylinders.

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Gravity bleed your brakes starting at the wheel farthest from the master cylinder. No pweddle pumping. I Fill M/C and leave cover off. Then open the bleeder and watch what is coming out. Uou can see bubbles. When the fluid drips steady and without bubbles, cole and do the same to the other three. Don't let the master cykinder get low because thr fluid level helps move the fluid and air through the lines.Periodically tap the break lone with your wrench to keep everything moving.. When sll bleeders drip clean and steady. Make sore your rear brakes are adjusted to barely touch the drum. Then top off the master cylinder, cap it and give yourself a "break". :)

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