I've had a flurry of topics regarding GMT400 brakes because one just kicked my behind, but I think it wouldn't hurt to have a thread specifically about bleeding practices these systems. If it matters, the later years like '98/9.
I at least have a few questions:
1) when you activate the ABS bleed, the scanner prompts you to press and hold the pedal, but where should this be? Lightly depressed? Mid-travel? To the floor? Does it matter?
2) I just read of the OTC 7853 which is meant to depress and equalize the prop valve "nibs" in the ABS unit. Does this help? I ordered the tool for future use because, well, it's a tool I don't have and that's simply not acceptable.
3) there's always talk of depressing and bleeding the valve at the ABS HCU itself -- I'm unclear if this is a substitute for activating the ABS bleed procedure with a scanner, or are BOTH supposed to be done? It seems most people bleeding here are weekend warriors trying to skirt a bidirectional scanner, but maybe not.
I at least have a few questions:
1) when you activate the ABS bleed, the scanner prompts you to press and hold the pedal, but where should this be? Lightly depressed? Mid-travel? To the floor? Does it matter?
2) I just read of the OTC 7853 which is meant to depress and equalize the prop valve "nibs" in the ABS unit. Does this help? I ordered the tool for future use because, well, it's a tool I don't have and that's simply not acceptable.
3) there's always talk of depressing and bleeding the valve at the ABS HCU itself -- I'm unclear if this is a substitute for activating the ABS bleed procedure with a scanner, or are BOTH supposed to be done? It seems most people bleeding here are weekend warriors trying to skirt a bidirectional scanner, but maybe not.
