My 1994 LC 80 series brake pedal is initially spongy, 1st 1/4 pedal travel then firms up. The truck was this way from the day I bought it 12/2023. Now it would feel like rear brakes shoes out of adjustment on a rear drum brake truck.
Replaced all 4 calipers, Pads, Rotors, Stainless Steel brake hoses Frame to Axle and Axle to Calipers front and rear. Just replaced a New ASIAN master cylinder "ABS" option brakes rear full float, rear disc brakes. Pedal is identical to to before the 1/4 pedal spongy feel, and firms up. Old chev 88 year pickups were like this. My 100 is not that way at all.
When the truck was on jack stands and rear axle drooping it feels worse, load proportional valve reducing fluid pressure rot rear, the pedal feels linda the same symptom but worse.
Adjusted the level valve to get higher pressure when on the ground level, and pedal is better, but still spongy 1st 1/4 travel.
I do not know the characteristics of the 80 what's normal what's not. My 100 spoils me for better brakes.
Ok, please chime in....
All pressure bleed with pressure bleeder and bled ABS lines, Load ProP Valve and each Caliper. NO change, to how it was when I bought it 12/2023.
Replaced all 4 calipers, Pads, Rotors, Stainless Steel brake hoses Frame to Axle and Axle to Calipers front and rear. Just replaced a New ASIAN master cylinder "ABS" option brakes rear full float, rear disc brakes. Pedal is identical to to before the 1/4 pedal spongy feel, and firms up. Old chev 88 year pickups were like this. My 100 is not that way at all.
When the truck was on jack stands and rear axle drooping it feels worse, load proportional valve reducing fluid pressure rot rear, the pedal feels linda the same symptom but worse.
Adjusted the level valve to get higher pressure when on the ground level, and pedal is better, but still spongy 1st 1/4 travel.
I do not know the characteristics of the 80 what's normal what's not. My 100 spoils me for better brakes.
Ok, please chime in....
All pressure bleed with pressure bleeder and bled ABS lines, Load ProP Valve and each Caliper. NO change, to how it was when I bought it 12/2023.