I haven't taken a vehicle of mine to a shop in over 10 years, but I'm about out of ideas.....I cannot get a firm pedal in my 80.
Things that have been done:
4 new calipers - These were purchased new from a mix of Rock Auto and Amazon. All fit and match the dimensions of the originals exactly.
New pads/rotors
New lines except for the long line from the MC to the rear proportioning valve. This has been inspected and seems to be in good shape.
ABS/LSPV delete - I followed a couple of online tutorials and believe it's been done correctly.
New Master Cylinder - Followed the advice of folks here and got this one More Information for ADVICS BMT068 - https://www.rockauto.com/en/moreinfo.php?pk=1945126&cc=1276679&pt=1836&jsn=907
Bleeding - I've used a vacuum bleeder, a pressure bleeder, and the 2 person method. I've completely flushed all of the old fluid and the fluid that comes out of every caliper is very very clean.
Booster - From what I can tell it's OEM, but it's certainly functioning because the pedal gets extremely hard when I pull the vacuum line.
Things I've tried:
1. I extended the booster push rod out a lot just to see if that made a difference. It did...the pedal got to a very serviceable point, but after a few miles my brakes locked up and I got treated to the lovely smell of roasted brake pads. Note - this has been adjusted back to within the 0-0.02" spec with a pushrod adjustment tool (the H frame variety"
2. Tapping the lines and calipers - While the pressure bleeder was doing its thing I went around jiggling the lines and hoses and tapping the calipers with a rubber mallet just to see if there was a pocket somewhere.
3. Braking without the booster - That was not fun even at like 4mph.
I'm going out of my mind...at this point it's just a boring old hydraulic braking system and SHOULD be functioning. I checked to make sure I didn't do something stupid like put the calipers on upside down, but it all looks like it should to me. All the bolts are torqued to factory spec, there's fluid at every caliper, it's all clean, there are no visible bubbles, but the pedal still goes nearly to the floor before I feel any actual braking power. I made a similar thread asking whether or not I should delete my ABS, and I generally hate reposting but I'm 100% out of ideas.
Thanks all,
Things that have been done:
4 new calipers - These were purchased new from a mix of Rock Auto and Amazon. All fit and match the dimensions of the originals exactly.
New pads/rotors
New lines except for the long line from the MC to the rear proportioning valve. This has been inspected and seems to be in good shape.
ABS/LSPV delete - I followed a couple of online tutorials and believe it's been done correctly.
New Master Cylinder - Followed the advice of folks here and got this one More Information for ADVICS BMT068 - https://www.rockauto.com/en/moreinfo.php?pk=1945126&cc=1276679&pt=1836&jsn=907
Bleeding - I've used a vacuum bleeder, a pressure bleeder, and the 2 person method. I've completely flushed all of the old fluid and the fluid that comes out of every caliper is very very clean.
Booster - From what I can tell it's OEM, but it's certainly functioning because the pedal gets extremely hard when I pull the vacuum line.
Things I've tried:
1. I extended the booster push rod out a lot just to see if that made a difference. It did...the pedal got to a very serviceable point, but after a few miles my brakes locked up and I got treated to the lovely smell of roasted brake pads. Note - this has been adjusted back to within the 0-0.02" spec with a pushrod adjustment tool (the H frame variety"
2. Tapping the lines and calipers - While the pressure bleeder was doing its thing I went around jiggling the lines and hoses and tapping the calipers with a rubber mallet just to see if there was a pocket somewhere.
3. Braking without the booster - That was not fun even at like 4mph.
I'm going out of my mind...at this point it's just a boring old hydraulic braking system and SHOULD be functioning. I checked to make sure I didn't do something stupid like put the calipers on upside down, but it all looks like it should to me. All the bolts are torqued to factory spec, there's fluid at every caliper, it's all clean, there are no visible bubbles, but the pedal still goes nearly to the floor before I feel any actual braking power. I made a similar thread asking whether or not I should delete my ABS, and I generally hate reposting but I'm 100% out of ideas.
Thanks all,