just bought car was undriven and in garage for over 10 years has only 8700 miles bled system and installed new master cylinder and bled system again still spongy and have to pump brake to stop vehicle
BMW Q&AAsk Your Question
1990 BMW 535i Question: 90 535i brakes spongy
Answer #1pushrod December 16, 2012, 17:11Master
Propperly bleed brake system! Or get a repair shop to fix the problem. You may not have time to pump the brakes next time you need to STOP!!
Replybeamer 49, December 16, 2012, 18:01Rookie
is there anything specific to the braking system of a bmw 535i the system was bled several times with no sign of air thats why we changed the master cylinder yet no help
Answer #2your.mechanic December 16, 2012, 18:39Master
did you just remove the old master cylinder and put the brand new one in its place...then filled it up with brake fluid?
Replybeamer 49, December 16, 2012, 22:15Rookie
bled system again after replacing
Replyyour.mechanic, December 16, 2012, 23:17Master
oh? so you bled them again for the FIRST time...right?
Replybeamer 49, December 17, 2012, 08:44Rookie
bled the system before we replaced master cylinder and again after we installed new master cylinder
Replypushrod, December 17, 2012, 09:01Master
The problem is there is still a bunch of air in the system may take a GAL. of fluid to bleed!!
Did you bench bleed the NEW master cyl. before install?
Replyyour.mechanic, December 17, 2012, 11:55Master
There is his problem...he DIDN'T bench bleed the master cylinder...
Replybeamer 49, December 17, 2012, 12:17Rookie
so whats the solution now
Replyyour.mechanic, December 17, 2012, 13:16Master
bench bleed master cylinder (properly)
Answer #3ziptie12 December 18, 2012, 21:25Master
After all the messing with the master cylinder........have you physically removed wheels and observed each individual condition and operation? ALL components removed and inspected?? After sitting for 10 years , might have more than just faulty master cylinder, or that might not have been the problem in the first place?