Hey guys,
I just recently installed a wilwood 4 piston big brake kit on my 2000 Si.
after replacing the calipers/rotors i bled the system using a mac tools vacuum bleeder. It seemed to get all of the air out. yet when i push the brake pedal with the car running it feels spongy and goes down about 2/3 of the way with no resistance, even when the pedal hits resistance i can keep pushing it.
So naturally my first reaction was that there was still air in the lines, so i bled all 4 corners with the vacuum bleeder....no better. so i gravity bled all 4 corners, no air bubbles from the rear, and a few from the front. still the pedal feels the same.
I was leaning towards torn seals in the master cylinder from pumping the brakes without a piece of wood under the pedal to keep it in its normal travel range. (mistake i know, just slipped my mind) although the pedal stays up and firm when the engine is off. (the pedal moves down slightly before i hit resistance. could the effect just be amplified when the brake booster is working? causing the excessive free play in the pedal?)
as far as i know my master cylinder did not run dry while changing the calipers, at least thats what my friends say.
so next step is to remove the master cylinder, disassemble it and inspect the seals. if the seals are not blatantly damaged i will bench bleed the master i try again.
Am i heading on the right track?
any input would be great guys, thanks!
I just recently installed a wilwood 4 piston big brake kit on my 2000 Si.
after replacing the calipers/rotors i bled the system using a mac tools vacuum bleeder. It seemed to get all of the air out. yet when i push the brake pedal with the car running it feels spongy and goes down about 2/3 of the way with no resistance, even when the pedal hits resistance i can keep pushing it.
So naturally my first reaction was that there was still air in the lines, so i bled all 4 corners with the vacuum bleeder....no better. so i gravity bled all 4 corners, no air bubbles from the rear, and a few from the front. still the pedal feels the same.
I was leaning towards torn seals in the master cylinder from pumping the brakes without a piece of wood under the pedal to keep it in its normal travel range. (mistake i know, just slipped my mind) although the pedal stays up and firm when the engine is off. (the pedal moves down slightly before i hit resistance. could the effect just be amplified when the brake booster is working? causing the excessive free play in the pedal?)
as far as i know my master cylinder did not run dry while changing the calipers, at least thats what my friends say.
so next step is to remove the master cylinder, disassemble it and inspect the seals. if the seals are not blatantly damaged i will bench bleed the master i try again.
Am i heading on the right track?
any input would be great guys, thanks!
