Help with a Q45 brake upgrade - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

xcusememisswyn · 03-15-2007, 05:01 PM

I just installed Q45 front brakes on my ABS equipped S14, and took it for a short drive. When I press the pedal down the first time it gives very little response, but if i let off the pedal then apply the same force again, its brakes like a pro. I dont know why it would give me this problem, and i have bled the brakes a few times so theres no air in the system. I am just trying to figure out why I need to press the brake pedal twice before i get the stopping power i should expect from q45 brakes every time.

articdragon192 · 03-15-2007, 05:07 PM

Were the bleeder screws on the brakes pointing up?

markyboi · 03-15-2007, 05:17 PM

air in the system

xcusememisswyn · 03-15-2007, 05:28 PM

yes they are facing up, and i dont think theres air in the system, i put speed bleeders on and took my time to bleed the system clean, but i guess ill try again tommo

projectRDM · 03-15-2007, 05:46 PM

Did you unplug the ABS actuator before bleeding? If not, there's still air in the lines.

xcusememisswyn · 03-15-2007, 07:00 PM

Quote:

Originally Posted by R240NA

Did you unplug the ABS actuator before bleeding? If not, there's still air in the lines.

no, wheres that? sounds like an easy fix...

thanks

GR8WHITE · 03-15-2007, 07:29 PM

hey man i had the same problem when stopping the pedal went down and was mushy but if i let off and hit them again they were firm at the top, i checked everything like you but i noticed that around the caliper boots the two big round ones around the pistons were moist with fluid and there was fluid on my rims, the calipers seals were leaking from sitting in a junk yard so everytime i hit the brakes a little fluid would come out but they would pump up and hold the second time i hit the brakes.

projectRDM · 03-15-2007, 09:04 PM

Quote:

Originally Posted by xcusememisswyn

no, wheres that? sounds like an easy fix...

thanks

Under the hood, the big shiny thing with brake lines going in/out of it. FSM clearly states to unplug the power to it before bleeding.

Please tell me you weren't serious.

GR8WHITE · 03-16-2007, 05:31 PM

im not talking about the damn master cylinder i am talking about a similar problem that i had with my q45 brake swap that had nothing to do with the damn master cylinder.

95Kouki · 03-15-2007, 05:55 PM

depending on the mileage you could've blown the O-Ring Seals of the master cylinder while bleeding your brakes...sediment collects on the unused part of the master cylinder bore and when you're bleed your brakes you use that unused portion that has a very small chance of damaging your seals...but it does happen...use a vacum bleeder...saves your leg...also get rid of the Air Bleeders...i had problems with mine....good luck man

03-15-2007, 05:01 PM	#1
xcusememisswyn Zilvia Addict Join Date: May 2005 Location: New Jersey Age: 37 Posts: 856 Trader Rating: (0) Feedback Score: 0 reviews	Help with a Q45 brake upgrade I just installed Q45 front brakes on my ABS equipped S14, and took it for a short drive. When I press the pedal down the first time it gives very little response, but if i let off the pedal then apply the same force again, its brakes like a pro. I dont know why it would give me this problem, and i have bled the brakes a few times so theres no air in the system. I am just trying to figure out why I need to press the brake pedal twice before i get the stopping power i should expect from q45 brakes every time.

03-15-2007, 05:07 PM	#2
articdragon192 Post Whore! Join Date: Jan 2005 Location: West covina Age: 39 Posts: 6,792 Trader Rating: (9) Feedback Score: 9 reviews	Were the bleeder screws on the brakes pointing up? __________________ Need help? Click here Still stumped? Try this Can't find what you're looking for? Here you go.

03-15-2007, 05:55 PM	#10
95Kouki Zilvia Member Join Date: Dec 2005 Location: Palmdale Posts: 263 Trader Rating: (2) Feedback Score: 2 reviews	depending on the mileage you could've blown the O-Ring Seals of the master cylinder while bleeding your brakes...sediment collects on the unused part of the master cylinder bore and when you're bleed your brakes you use that unused portion that has a very small chance of damaging your seals...but it does happen...use a vacum bleeder...saves your leg...also get rid of the Air Bleeders...i had problems with mine....good luck man __________________ People will always be haters...can't change that...just out drive them

03-15-2007, 05:17 PM	#3
markyboi Zilvia FREAK! Join Date: Feb 2006 Location: california Posts: 1,105 Trader Rating: (0) Feedback Score: 0 reviews	air in the system

03-15-2007, 05:28 PM	#4
xcusememisswyn Zilvia Addict Join Date: May 2005 Location: New Jersey Age: 37 Posts: 856 Trader Rating: (0) Feedback Score: 0 reviews	yes they are facing up, and i dont think theres air in the system, i put speed bleeders on and took my time to bleed the system clean, but i guess ill try again tommo

03-15-2007, 05:46 PM	#5
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Did you unplug the ABS actuator before bleeding? If not, there's still air in the lines.

03-15-2007, 07:29 PM	#7
GR8WHITE Leaky Injector Join Date: May 2006 Location: CA Posts: 63 Trader Rating: (0) Feedback Score: 0 reviews	hey man i had the same problem when stopping the pedal went down and was mushy but if i let off and hit them again they were firm at the top, i checked everything like you but i noticed that around the caliper boots the two big round ones around the pistons were moist with fluid and there was fluid on my rims, the calipers seals were leaking from sitting in a junk yard so everytime i hit the brakes a little fluid would come out but they would pump up and hold the second time i hit the brakes.

03-16-2007, 05:31 PM	#9
GR8WHITE Leaky Injector Join Date: May 2006 Location: CA Posts: 63 Trader Rating: (0) Feedback Score: 0 reviews	im not talking about the damn master cylinder i am talking about a similar problem that i had with my q45 brake swap that had nothing to do with the damn master cylinder.