Strange brake issue...
#1
Strange brake issue...
Ok, so ill start off with the basics.
08 Grand Touring. Brembo brakes with VDC, drilled and slotted stoptech rotors.
noticed starting to get a soft pedal. checked have roughly 50-60% life left on my brake pads, check the fluid level and its just below the full mark, inspect for any signs of leaks, and don't like the look of on of the brake hoses, so i ordered braided stainless lines. installed the lines, bled the system several times with no air coming out, used a pressure bleeder as well as did the old fashioned manual bleed process. still have a shitty feeling pedal, decided its probably a bad master cylinder. replaced it re did the pressure and manual bleed process and still have a shitty pedal....
here is the issue. the first 1/2 of the pedal travel is super soft and like there is no brake pressure being applied, then the pedal is solid, but the car DOES NOT want to stop. i can push as hard as i want and the car has no change in how hard it stops. (same problem on both master cylinders)
No codes in the ABS system, and with a scan tool i can activate all the valves in the ABS pump, and they all seem to work normally, so i don't want to say the ABS pump has failed, but i'm out of options.. i can't seem to find any other explanation...
i have ordered another master cylinder in fear the new one i got was just defective....
anyone have any ideas?
08 Grand Touring. Brembo brakes with VDC, drilled and slotted stoptech rotors.
noticed starting to get a soft pedal. checked have roughly 50-60% life left on my brake pads, check the fluid level and its just below the full mark, inspect for any signs of leaks, and don't like the look of on of the brake hoses, so i ordered braided stainless lines. installed the lines, bled the system several times with no air coming out, used a pressure bleeder as well as did the old fashioned manual bleed process. still have a shitty feeling pedal, decided its probably a bad master cylinder. replaced it re did the pressure and manual bleed process and still have a shitty pedal....
here is the issue. the first 1/2 of the pedal travel is super soft and like there is no brake pressure being applied, then the pedal is solid, but the car DOES NOT want to stop. i can push as hard as i want and the car has no change in how hard it stops. (same problem on both master cylinders)
No codes in the ABS system, and with a scan tool i can activate all the valves in the ABS pump, and they all seem to work normally, so i don't want to say the ABS pump has failed, but i'm out of options.. i can't seem to find any other explanation...
i have ordered another master cylinder in fear the new one i got was just defective....
anyone have any ideas?
#3
i have no leaks anywhere, have been fighting the issue for over a week now, have tried every thing to get all the air out of the system, i get solid fluid out, no air bubbles at all. have tried tapping the calipers with a rubber mallet while bleeding, like i said i've used a pressure bleeder, and the old fashioned pumping the pedal, and i cant get it working.
#4
Super Moderator
MY350Z.COM
MY350Z.COM
iTrader: (8)
Pain to get the air out , takes multiple times.
#6
Super Moderator
MY350Z.COM
MY350Z.COM
iTrader: (8)
Trending Topics
#10
Registered User
Join Date: Aug 2012
Location: Long Beach, CA
Posts: 3,683
Likes: 0
Received 0 Likes
on
0 Posts
I just reread your first post, Try changing the pads and see if that gives you a more solid feel after you change out your MC again.
Last edited by stuartc323; 08-05-2013 at 10:18 AM.
#12
Super Moderator
MY350Z.COM
MY350Z.COM
iTrader: (8)
#15
Just reading through many threads as I'm having a very similar issue, what is the vacuum booster?
Many thanks.
Edit:
Ah something like this right?
http://www.z1motorsports.com/350_g35...oducts_id=4280
Many thanks.
Edit:
Ah something like this right?
http://www.z1motorsports.com/350_g35...oducts_id=4280
Last edited by RobPhoboS; 02-28-2015 at 03:40 AM.
#17
#18
I'll take a look at it on thursday, swap out the main one I can see.
How long should a stock valve last ?
Thread
Thread Starter
Forum
Replies
Last Post