Brakes go to the floor :(
- Thread starter Raspi454
- Start date
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The newer trucks have three-channel ABS--individual front brakes, both rear brakes together. Each channel has a pair of solenoid valves. Front brakes share an accumulator, rear brakes have an accumulator.
Unless you can activate ALL THREE channels, you're doing a partial job.
thegawd
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alright well that makes sense. so since I wrote that this afternoon my wife has since suggested that I get a scanner capable of performing everything my existing scanner cant do. I have a complete distributor assemble that I wanted to install in the Burb today but choose to just use the cap n rotor so I could avoid the possible cam relearn process. she was wondering why I didn't install the base and so I told her... shes a keeper. 
haha
haha
Yes.
That's why I thought, I replaced it because it came with it, and I was bored lol
You have to bleed the MC itself, then all 4 wheels,starting at the passengers rear, then drivers rear, then top off the fluid, then the passengers front, then drivers front. Each spot should be done 3 to 5 times each. All of the air needs to be bleed out.
Just adding to what kennythewelder said, you have to bench bleed the master in order to get it free of air and then bleed the lines. Regardless of if you’re going the “gravel road” or scan tool route for bleeding the ABS, you do that procedure after the initial bleed, then bleed all four again.
FWIW, I hope you did bench bleed that MC before you stuck it on there and attached lines. You will push a substantial amount of air into the lines otherwise and it can make bleeding a real bear. I think most MCs I have seen come with a little instruction sheet for how they recommend you do the bleeding.
FWIW, I hope you did bench bleed that MC before you stuck it on there and attached lines. You will push a substantial amount of air into the lines otherwise and it can make bleeding a real bear. I think most MCs I have seen come with a little instruction sheet for how they recommend you do the bleeding.
Most master cylinders are installed with the front tipped "up". It is ABSOLUTELY IMPOSSIBLE to get them to bleed properly, since the air bubble(s) end up forward of the ports leading to the reservoir, and higher than the tubes leading to the wheel cylinders.
Thus the "bench" bleeding, where the master can be at least level, and preferably tipped "down" in front.
Sometimes, the last little air bubble needs to be removed with the master connected to the tubes in the vehicle, but separated from the firewall or booster so the front can be pushed down enough to get the air bubble to the rear--where with a little short-stroking of the primary piston, it'll burp up into the reservoir.
Thus the "bench" bleeding, where the master can be at least level, and preferably tipped "down" in front.
Sometimes, the last little air bubble needs to be removed with the master connected to the tubes in the vehicle, but separated from the firewall or booster so the front can be pushed down enough to get the air bubble to the rear--where with a little short-stroking of the primary piston, it'll burp up into the reservoir.
