Hey guys, as part of my front and rear suspension overhaul, I did total brake overhaul as well.
- New master cylinder from DMCMW (DMC logo version) - this was a few years old but still in the original sealed wrap and no sign of corrosion or anything.
- Turned front and rear rotors
- Brake calipers plated and new bleeders
- All piston seals replaced
- New SS front pistons, rears were re-used as they still looked great
- New SS crossover pipes for the rear calipers
- Re-used my SS flex brake lines
- Castrol GT-LMA brake fluid
- New pads and hardware from DMCMW
- Powder coated the booster bracket and painted the booster
- New check valve and grommet, installed with Girling veggie-grease, replaced the hose vacuum hose from booster to hard pipe
- New seal between the master cylinder and booster
Anyway, first I installed the master cylinder and "bench bled" it using cut up old brake line and directing hoses into the fluid. I pumped a few times and no longer heard air pushing through, so then I hooked up the two hard lines and started to bleed the brakes in the order in the book (RR, LR, RF, LF). I tried a MityVac but didn't have a lot of confidence in the purge so later enlisted the wife to do it the old "pump pump pump HOLD" technique while I cracked the bleeder and watched the air come out with a clear tube into a jar. That was a lot better, and we went around the car twice. Then I went on a 20 minute test drive and I was stopping but the pedal felt a bit spongy. We tried again and I definitely got more air out and I feel like it's all purged now. The M/C never went below halfway during all this.
I have gone around the car multiple times with a lamp and I'm confident there are no brake fluid leaks.
And yet the brakes still don't feel super hard.
Any techniques I'm missing or should I bed the brakes first and then try bleeding again? I'm not doing any hard braking until I do a brake bedding sequence.