Soft brake pedal on a track (HR)
11-07-2016, 09:48 AM
#24
Here's a thread I used to replace the seals (thanks Blurvision). I just replaced them as I've been working the car pretty hard at the track. I'd plug the lines with something so the system doesn't go dry when you take the lines off. I made the mistake of just draining the system and that's where my soft pedal came from if I recall. I'd think you can get the rebuild kit from your dealer.
It's a dirty nasty job getting the pistons to pop out at the same time. It'll definitely be easier the next time.
http://www.nissanraceshop.com/produc...50z-g35-front/
https://my350z.com/forum/brakes-and-...th-photos.html
It's a dirty nasty job getting the pistons to pop out at the same time. It'll definitely be easier the next time.
http://www.nissanraceshop.com/produc...50z-g35-front/
https://my350z.com/forum/brakes-and-...th-photos.html
Last edited by JBJ; 11-07-2016 at 10:06 AM.
03-20-2017, 07:15 AM
#26
New Member
Thread Starter
So after my first event this year (new RBF600 fluid, new DS2500 pads) I still seem to have this issue. The pedal is soft when braking unless I tap on it once or twice with my left foot and then brake, it's a lot firmer then.
I already have Stoptech ss lines installed. Brake fluid level stays the same. Everything is ok when driving the car daily - firm pedal all the time!
I haven't looked at the seals in the calipers yet. Is this the next thing I should do? What about the brake pump?
I already have Stoptech ss lines installed. Brake fluid level stays the same. Everything is ok when driving the car daily - firm pedal all the time!
I haven't looked at the seals in the calipers yet. Is this the next thing I should do? What about the brake pump?
Last edited by GodISmE; 03-20-2017 at 08:21 AM.
03-20-2017, 08:35 AM
#27
New Member
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Franknbeans (07-03-2017)
03-21-2017, 05:35 AM
#28
I've had this similar feeling as well GodISmE and I'm fairly sure it's trapped air rather than knock-back.
Ideally you need to trigger the ABS (on gravel or with Consult), then bleed it again - I had to do this about 7 or 8 times !
And after several attempts it should firm up, also the other factor which will count for a minor bit of pedal travel is the brake pad compressing ever so slightly. I have used a few different pads now and there IS a difference.
Ideally you need to trigger the ABS (on gravel or with Consult), then bleed it again - I had to do this about 7 or 8 times !
And after several attempts it should firm up, also the other factor which will count for a minor bit of pedal travel is the brake pad compressing ever so slightly. I have used a few different pads now and there IS a difference.
03-21-2017, 07:22 AM
#29
New Member
Thread Starter
So you think that air is trapped in the ABS module? Any other way of getting the air out, e.g. using ECU software to cycle the pump?
How to prevent it from happening again though? The mechanic that installed my ss brake lines was not a specialist and one option is that he might have fu...d something up. On the other hand, maybe the caliper seals are letting air in and need to be replaced?
How to prevent it from happening again though? The mechanic that installed my ss brake lines was not a specialist and one option is that he might have fu...d something up. On the other hand, maybe the caliper seals are letting air in and need to be replaced?
03-21-2017, 08:33 AM
#30
So you think that air is trapped in the ABS module? Any other way of getting the air out, e.g. using ECU software to cycle the pump?
How to prevent it from happening again though? The mechanic that installed my ss brake lines was not a specialist and one option is that he might have fu...d something up. On the other hand, maybe the caliper seals are letting air in and need to be replaced?
How to prevent it from happening again though? The mechanic that installed my ss brake lines was not a specialist and one option is that he might have fu...d something up. On the other hand, maybe the caliper seals are letting air in and need to be replaced?
Gravel - just trigger the ABS yourself on loose/wet surface, go back home and try again.
I'm not exaggerating about doing it 7+ times
Try that first before, it takes some time and gradually over a few days it improved for me.
No other software I'm aware of apart from Nissan's Consult.
03-21-2017, 08:54 AM
#31
In the FSM it says to either disconnect the ABS module, or disconnect the battery, when bleeding the brakes. I've done this every time I've done my brakes and never had an issue. I've even gone from stock '07 base brakes to OEM Brembo with SS lines and it only took 1 good session with my power bleeder and the brake were perfect. Of course I disconnected the ABS module and did the order specified in the FSM each time.
03-21-2017, 09:07 AM
#32
In the FSM it says to either disconnect the ABS module, or disconnect the battery, when bleeding the brakes. I've done this every time I've done my brakes and never had an issue. I've even gone from stock '07 base brakes to OEM Brembo with SS lines and it only took 1 good session with my power bleeder and the brake were perfect. Of course I disconnected the ABS module and did the order specified in the FSM each time.
(it's what I'm guessing at as I had the same)