Help Brakes keep locking up!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Rockda240 · 10-18-2009, 04:10 PM

I am in need of some serious help, my brakes keep locking up, I did a full z32 conversion bled the brakes twice and for some reason the shit just keeps locking up on my ass!

armand · 10-18-2009, 04:16 PM

take off your brake master cylinder, and try adjusting the rod on your brake booster. i had the same problem a few years ago and that fixed it

240sxxs · 10-18-2009, 04:18 PM

drive slow and brake from distance = problem solve

Rockda240 · 10-18-2009, 04:39 PM

does the push rod just spin or do you have to pull it then turn or what? I checked the fsm, no such luck.

punk138 · 10-18-2009, 04:44 PM

i recently had the same problem, i changed out the entire brake booster and now everything works great. but im running the stock s13 booster not the z32...

Rockda240 · 10-18-2009, 09:48 PM

So how the hell do you adjust the pushrod?

ericb382 · 10-18-2009, 10:20 PM

Hold with needle nose, twist. Done.

Rockda240 · 10-19-2009, 12:10 AM

alright, thank you!

P-Funk alot · 10-19-2009, 01:47 AM

does it lock up after you brake or is it locked up at all times

Brye · 10-21-2009, 04:57 PM

I'm having the same problem.

I've changed the brake booster, master cylinder, and brake booster check valve. All at the same time.

It used to lock up only at high speed sprints, and stop and go traffic. Now, it's just driving it locks up.

I'm thinking it's pulling too much vacuum but I don't know how to check how much vacuum it's pulling, and how much it should pull.

I'm having to pull the vacuum hose from the check valve on the booster side to release the brakes. So, I'm guessing it's retaining vacuum on the booster side.

Rockda240 · 10-23-2009, 10:02 PM

it locks up while I am braking.

mazersx · 10-23-2009, 10:12 PM

CHANGE THE BRAKE MASTER CYLINDER? 17/16 or 1" 1/16

Rockda240 · 10-23-2009, 10:23 PM

I already replaced the master cylinder!!! From 240 to z32 17/16"!!! Replaced basically the whole brake system except the booster!

93nismo · 10-23-2009, 10:59 PM

if adjusting it dosent work just replace it. make sure the hose going to it is good as well.

super240s14 · 10-23-2009, 11:09 PM

i have that problem here and now, i think it could br the calipers seizing but not 100 % sure lol, i know thats the problem with mines, and if not then change your mc back to your old mc if you havent done so

ericb382 · 10-23-2009, 11:29 PM

What locks up? Front, rear, both? Are you saying that when you let go of the pedal it keeps breaking, or that when you hit the breaks you lock the tires up?

gsxr141 · 10-23-2009, 11:43 PM

the fronts on my 240 would lock up after about 20 min of driving. i replaced the master, then the hoses. it ended up being the calipers sticking on. make sure the calipers you got are good.

Rockda240 · 10-23-2009, 11:47 PM

yeah when I stop and let off the pedal and then go to press it down again, the brake pedal doesn't go down at all.

Rockda240 · 10-23-2009, 11:49 PM

is there a way to adjust the pushrod from under the dash? I undid the locknut but I don't see how to shorten it. Is there any specific site that can help me with this? Maybe even pics?

silviaconcept · 10-23-2009, 11:54 PM

adjust your pedal

ericb382 · 10-25-2009, 02:10 PM

That doesnt' sound like the MC adjustment. That just fixes mushy pedal/free play in the pedal. Basically how far you have to puch the pedal before you start getting engagement. That deffinately sounds like the caliper(s) seizing up.

Rockda240 · 10-26-2009, 01:32 AM

Yeah I just replaced the master cylinder. I think I just need to adjust the pushrod or something is wrong with the brake booster, I just replaced everything else.

Rockda240 · 10-26-2009, 01:50 AM

my whole point is that it was adjusted and it won't disengage!

ericb382 · 10-26-2009, 09:00 AM

Ok, then try backing the rod off, if it works then that was your problem.... Look in the FSM, it covers how.

10-18-2009, 04:10 PM	#1
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	Help Brakes keep locking up!!! I am in need of some serious help, my brakes keep locking up, I did a full z32 conversion bled the brakes twice and for some reason the shit just keeps locking up on my ass!

10-18-2009, 04:18 PM	#3
240sxxs Zilvia Member Join Date: Aug 2008 Location: o were Posts: 277 Trader Rating: (0) Feedback Score: 0 reviews	drive slow and brake from distance = problem solve __________________ The pretty one Arn't free and the free one Arn't pretty

10-18-2009, 04:44 PM	#5
punk138 Zilvia Addict Join Date: Nov 2007 Location: BroCal Posts: 602 Trader Rating: (12) Feedback Score: 12 reviews	i recently had the same problem, i changed out the entire brake booster and now everything works great. but im running the stock s13 booster not the z32... __________________ yes we still roll fenders

10-23-2009, 10:59 PM	#14
93nismo Zilvia Addict Join Date: Dec 2008 Location: sycamore il Posts: 766 Trader Rating: (14) Feedback Score: 14 reviews	if adjusting it dosent work just replace it. make sure the hose going to it is good as well. __________________ WTB: 1/24 scale chuki s13 model.

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10-18-2009, 04:16 PM	#2
armand Zilvia Member Join Date: May 2003 Location: barbourville kentucky Age: 48 Posts: 262 Trader Rating: (8) Rides Gallery: armand Feedback Score: 8 reviews	take off your brake master cylinder, and try adjusting the rod on your brake booster. i had the same problem a few years ago and that fixed it

10-18-2009, 04:39 PM	#4
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	does the push rod just spin or do you have to pull it then turn or what? I checked the fsm, no such luck.

10-18-2009, 09:48 PM	#6
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	So how the hell do you adjust the pushrod?

10-18-2009, 10:20 PM	#7
ericb382 Zilvia Member Join Date: Oct 2005 Location: Mesa, Az Posts: 293 Trader Rating: (4) Feedback Score: 4 reviews	Hold with needle nose, twist. Done.

10-19-2009, 12:10 AM	#8
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	alright, thank you!

10-19-2009, 01:47 AM	#9
P-Funk alot Zilvia Addict Join Date: Sep 2009 Location: 909 Age: 39 Posts: 831 Trader Rating: (7) Feedback Score: 7 reviews	does it lock up after you brake or is it locked up at all times

10-21-2009, 04:57 PM	#10
Brye Join Date: Mar 2008 Location: Brewton,AL Age: 36 Posts: 23 Trader Rating: (1) Feedback Score: 1 reviews	I'm having the same problem. I've changed the brake booster, master cylinder, and brake booster check valve. All at the same time. It used to lock up only at high speed sprints, and stop and go traffic. Now, it's just driving it locks up. I'm thinking it's pulling too much vacuum but I don't know how to check how much vacuum it's pulling, and how much it should pull. I'm having to pull the vacuum hose from the check valve on the booster side to release the brakes. So, I'm guessing it's retaining vacuum on the booster side.

10-23-2009, 10:02 PM	#11
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	it locks up while I am braking.

10-23-2009, 10:12 PM	#12
mazersx Banned from the Marketplace Join Date: Oct 2008 Location: SoCAL 818/626/714 Posts: 1,904 Trader Rating: (32) Feedback Score: 32 reviews	CHANGE THE BRAKE MASTER CYLINDER? 17/16 or 1" 1/16

10-23-2009, 10:23 PM	#13
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	I already replaced the master cylinder!!! From 240 to z32 17/16"!!! Replaced basically the whole brake system except the booster!

10-23-2009, 11:09 PM	#15
super240s14 BANNED Join Date: Oct 2009 Location: southern ca Age: 36 Posts: 77 Trader Rating: (0) Feedback Score: 0 reviews	i have that problem here and now, i think it could br the calipers seizing but not 100 % sure lol, i know thats the problem with mines, and if not then change your mc back to your old mc if you havent done so

10-23-2009, 11:29 PM	#16
ericb382 Zilvia Member Join Date: Oct 2005 Location: Mesa, Az Posts: 293 Trader Rating: (4) Feedback Score: 4 reviews	What locks up? Front, rear, both? Are you saying that when you let go of the pedal it keeps breaking, or that when you hit the breaks you lock the tires up?

10-23-2009, 11:43 PM	#17
gsxr141 Zilvia Junkie Join Date: May 2008 Location: rochester Posts: 327 Trader Rating: (3) Feedback Score: 3 reviews	the fronts on my 240 would lock up after about 20 min of driving. i replaced the master, then the hoses. it ended up being the calipers sticking on. make sure the calipers you got are good.

10-23-2009, 11:47 PM	#18
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	yeah when I stop and let off the pedal and then go to press it down again, the brake pedal doesn't go down at all.

10-23-2009, 11:49 PM	#19
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	is there a way to adjust the pushrod from under the dash? I undid the locknut but I don't see how to shorten it. Is there any specific site that can help me with this? Maybe even pics?

10-23-2009, 11:54 PM	#20
silviaconcept Join Date: May 2006 Location: bay area Posts: 44 Trader Rating: (0) Feedback Score: 0 reviews	adjust your pedal

10-25-2009, 02:10 PM	#21
ericb382 Zilvia Member Join Date: Oct 2005 Location: Mesa, Az Posts: 293 Trader Rating: (4) Feedback Score: 4 reviews	That doesnt' sound like the MC adjustment. That just fixes mushy pedal/free play in the pedal. Basically how far you have to puch the pedal before you start getting engagement. That deffinately sounds like the caliper(s) seizing up.

10-26-2009, 01:32 AM	#22
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	Yeah I just replaced the master cylinder. I think I just need to adjust the pushrod or something is wrong with the brake booster, I just replaced everything else.

10-26-2009, 01:50 AM	#23
Rockda240 Leaky Injector Join Date: May 2007 Location: Enumclaw,Wa Age: 35 Posts: 81 Trader Rating: (0) Feedback Score: 0 reviews	my whole point is that it was adjusted and it won't disengage!

10-26-2009, 09:00 AM	#24
ericb382 Zilvia Member Join Date: Oct 2005 Location: Mesa, Az Posts: 293 Trader Rating: (4) Feedback Score: 4 reviews	Ok, then try backing the rod off, if it works then that was your problem.... Look in the FSM, it covers how.