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View Full Version : Help with a Q45 brake upgrade

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.
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
xcusememisswyn
03-15-2007, 07:00 PM
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
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.
projectRDM
03-16-2007, 05:35 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.

Fuck are you yelling at? I quoted a completely different post that had nothing to do with yours. Period. Do you always attack people who discuss completely unrelated shit?
altalti
03-24-2007, 01:20 PM
after you pushed the brakes the very first time this problem went away right? if so this happens everytime you push the brake pedal the first time after doing brakes it takes an extra second for the piston to pop back out to its normal position after being compressed. thats why when you do your brakes you always press them once before yuou drive. if this is the case and it only happened once there is no problem.