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Hello everybody,
I need some help.
I am working on 2003 GMC Sierra truck (4×4, 5.3L V8 LM7 motor). I need to change brake pads, brake rotors, and brake fluid.
After some research, I found out that GM ABS systems are tricky, and need a professional scanner tool in order to bleed the system.
I was going to bleed the system the old fashion way (2 man job) and I do not have a pro scanner tool for that.
Do you think that I will have problems afterwards? I do not want to have problems with brakes, obviously. And I don’t have a problem is ABS system has some old brake fluid in it.
Please, advise. Will I be able to bleed the system the old fashioned way?
Also, I have been carefully researching online and found this scanner, that is supposed to bleed brakes, anybody has any comments?
https://www.amazon.com/Scanner-Launch-CReader-Diagnostic-Computer/dp/B01MYGCI5N/ref=cm_cr_arp_d_product_top?ie=UTF8Thank you for your help!
Alex
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Bleeding the old fashion way should work fine for calipers and brake pads. Just be careful not to let master run dry or you will have bigger problems with it and ABS module getting air in it. Should that happen, you will need a scanner due to activate ABS Module. To due complete brake flush of master and lines, 2 man will work again not letting master run low and bleeding until you see fresh fluid. Would want to take turkey baster or something similiar and get out as much old fluid from Master as possible and refill there with new fluid 1st. In order to bleed what little is in ABS module, you would have to have scan tool to actuate but I would say what little that is compared to whole system, you are fine without.
Lastly gravity bleed calipers before pumping on pedal the 1st time goes along way for isolating air at calipers and not mixing through system.
Best of luck.Jjohnson1,
Thank you very much for your reply!
You confirmed my thoughts.
I will not let master cylinder dry, which is the key. I made a little tool (bottle with small hose) for bleeding calipers, so no air will get in the system. Therefore, no need to worry about ABS module.
When bleeding brakes, I will ask my partner to not pump the pedal, but press firmly instead. Not going crazy and pressing pedal to the floor though.
Also, I plan to crack bleeder when I retract cylinders in each caliper, not to have old fluid traveling up the system.
This should work. I am OK with having some old brake fluid in the ABS module.Thank you so much again!
Have a great day!Thank you for your help.
Brake job went flawlessly. I was very careful and didn’t let air in the system. There was no need to bleed the ABS unit, which would require a professional scan tool. As a side note, I am glad that I did the service, since brake fluid had a nasty dark grey color.Thank you again!
Hello Alex,
I was having the same problem when i replaced my master brake cylinder.
i purchased the pneumatic brake fluid bleeder and flushed all my lines. I didn’t need a special tool or scanner to do it. I have used this tool four times already to flush out old brake fluid. Works well for $33.00 that i spent on it.
Good luck.
Leo
https://www.harborfreight.com/pneumatic-brake-fluid-bleeder-61912.htmlHello Leo,
I heard about this brake bleeding kit. Seems that a lot of shops use it.
I work on the street, and don’t have an air compressor, so unfortunately it wouldn’t work for me. I used the two-person method, and it took a while to bleed the system, I used about 2 Qts of brake fluid. But it all came out good.
Thanks.Alex
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