How's it going I have a 96 sc400 so no matter what I do I can't get a constant firm brake pedal. About 6 months ago I rebuilt my master cylinder replaced piston bench bled it stuck it in flushed everything. Previous mc was bad so I havent felt what the brake pedal should feel like. I have to pump pedal once or twice before pressure builds up. Thought maybe my oem lines were bad and they were cracked pretty bad so I purchased stainless steel ones while I was replacing them I decided to paint calibers and install drilled and slotted. Installed new lines gravity bled calibers and bled lines. Pedal still weak falls to the floor frequently and pedal fade is horrible. Jacked up front end spun tires brakes worked properly did the same to the rear. So brakes have been bled roughly 4 times and master cylinder has been bled 2 times. If pedal slammed on seems to work great when gradually pushing pedal drops and has to be pressed multiple times. No leaks anywhere I'm now at a lose assuming the master cylinder is bad again? Could it be the booster? Any help is greatly appreciated! Thanks for reading

 

Would a bad abs module cause any braking issue? I have no light on for abs and have tried to set it off but haven't been able too.

 

Do you have vacuum leak going to master cylinder? Bad master cylinder ?

 

no vacuum leak but after exhausting everything I tore the master cylinder apart an sure enough one of the seals was deteriorating don't kno why it happened so fast.