Brake booster question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

unicoladron · 12-08-2007, 07:19 PM

so i was parting out my front clip today because i'm getting rid of it. i noticed the brake booster looks different than the one on my s13 240. it seems to be the same diameter, but it's ~.75 inches deeper. so of course, the JDM 180sx calipers/rotors are larger than stock 240sx USDM calipers/rotors, so i'm guessing this larger brake booster provides better stopping power? i was wondering if any of you guys noticed this as well, and if anyone has bolted on the JDM booster onto their 240. Since it's bigger and is in better condition, i'm probably just going to bolt it on but wanted to hear some of your opinions first. (and before anyone comments on the leaves, yes i cleaned them off lol)

here's a pic:

garagelu · 12-08-2007, 07:26 PM

yes bigger diaphram in the brake booster means better feeling pedal. And yes that will bolt on with no problem.

projectRDM · 12-08-2007, 08:15 PM

The OE US 5speed unit is single chamber, 230mm. Some of the JDM boosters as well as all S14 auto/ABS US cars are dual chamber 205mm/180mm.

MadScientist · 12-08-2007, 08:41 PM

Yeah the Z32 booster is a squeeze to get in the S-chassis... the JDM S14/S15 Booster is much easier and works just as well.

Have fun... and be sure to adjust the plunger.

-Drew

EAT Motorsports · 12-08-2007, 08:41 PM

abs vs non-abs

g6civcx · 12-08-2007, 08:45 PM

The purpose of the brake booster is to decrease pedal effort. The larger the booster, the easier the pedal effort.

I prefer smaller boosters because it's easier to modulate.

Look at JDM brake boosters and compare it with the USDM. Then tell me if you still want to bolt it on. Hint: look at the vacuum port.

unicoladron · 12-08-2007, 09:19 PM

well everyone had a good point.

thanks r240na, but it definitely came out of an s13 clip. do you think perhaps the original owner bolted this booster on from an s13? because this clip didn't have ABS.

g6civcx, you made a good point, but if if i were to bolt it on, i can just run a longer vacuum hose.

cdlong · 12-09-2007, 01:29 AM

this is just a guess, but could you just flip the booster over so the vacuum port is on the proper side?

drew, do you know the dimensions of the z32 booster? i was planning on going that route, but if the ABS/auto/JDM booster is close enough, i'm all for it.

here it is. z32 - Primary 230mm (9.06in) - Secondary 205mm (8.07in)

unicoladron · 12-09-2007, 02:10 PM

^--that is also a pretty good idea. i don't see why you couldn't flip it over, it's just a diaphragm inside, so it probably doesn't matter. but still, i'm just going to run a longer vac line...

Jung918 · 12-09-2007, 02:41 PM

or you could get a longer hose

cdlong · 12-09-2007, 05:41 PM

welcome to 3 posts ago.

Skullavera · 12-09-2007, 06:12 PM

^^^^^^^^^^^^^^^

MadScientist · 12-09-2007, 06:25 PM

Z32 is much larger then the USDM and JDM Boosters (S-Chassis)... Its a bitch to get in because of the diameter... you will be vey very tight against the strut tower while squeezing it in!!

You will spend more time adjusting the plunger then getting the the booster though. you have to take the MC off everytime, adjust, replace, test, repeat...

-Drew

Jung918 · 12-09-2007, 08:13 PM

Quote:

Originally Posted by cdlong

welcome to 3 posts ago.

you never seen my time machine have you

cdlong · 12-09-2007, 09:13 PM

thanks drew, didn't know that would be a problem. that suprising though since the z32 primary is the same diameter as the s14 manual booster. maybe the extra thickness with the large diameter is what makes it hard.

ABS/auto booster for me. anybody got one?

projectRDM · 12-09-2007, 09:24 PM

I have a couple I think. PM me.

cotbu · 12-09-2007, 09:35 PM

I run the s13 sr booster because, it was in better shape and easier to get to the 02 sensor. didn't modify anything that i can remember. Probably go back if I go top-mount.

cdlong · 12-10-2007, 03:21 AM

Quote:

Originally Posted by g6civcx

Look at JDM brake boosters and compare it with the USDM. Then tell me if you still want to bolt it on. Hint: look at the vacuum port.

random note, the vacuum port on my s14 is on the far side (closer to the fender than engine). that just seems odd. it seems that the JDM ones are the same way. and not necessarily dual chambered acording to this picture. you can see the vacuum line just to the left of the 2x4.

12-08-2007, 07:19 PM	#1
unicoladron Zilvia Junkie Join Date: Jul 2007 Location: Long Island, NY Age: 40 Posts: 568 Trader Rating: (0) Feedback Score: 0 reviews	Brake booster question so i was parting out my front clip today because i'm getting rid of it. i noticed the brake booster looks different than the one on my s13 240. it seems to be the same diameter, but it's ~.75 inches deeper. so of course, the JDM 180sx calipers/rotors are larger than stock 240sx USDM calipers/rotors, so i'm guessing this larger brake booster provides better stopping power? i was wondering if any of you guys noticed this as well, and if anyone has bolted on the JDM booster onto their 240. Since it's bigger and is in better condition, i'm probably just going to bolt it on but wanted to hear some of your opinions first. (and before anyone comments on the leaves, yes i cleaned them off lol) here's a pic: __________________ 1993 KA24DE for sale with 180k..running when pulled.... need to get rid of ASAP...i'm moving

12-08-2007, 08:15 PM	#3
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	The OE US 5speed unit is single chamber, 230mm. Some of the JDM boosters as well as all S14 auto/ABS US cars are dual chamber 205mm/180mm. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

12-08-2007, 08:41 PM	#5
EAT Motorsports Zilvia Member Join Date: Oct 2007 Location: Kirkland, WA Age: 18 Posts: 242 Trader Rating: (5) Feedback Score: 5 reviews	abs vs non-abs __________________

12-08-2007, 09:19 PM	#7
unicoladron Zilvia Junkie Join Date: Jul 2007 Location: Long Island, NY Age: 40 Posts: 568 Trader Rating: (0) Feedback Score: 0 reviews	well everyone had a good point. thanks r240na, but it definitely came out of an s13 clip. do you think perhaps the original owner bolted this booster on from an s13? because this clip didn't have ABS. g6civcx, you made a good point, but if if i were to bolt it on, i can just run a longer vacuum hose. __________________ 1993 KA24DE for sale with 180k..running when pulled.... need to get rid of ASAP...i'm moving

12-09-2007, 01:29 AM	#8
cdlong Nissanaholic! Join Date: Jun 2003 Location: Colorado Springs Age: 44 Posts: 1,865 Trader Rating: (0) Rides Gallery: cdlong Feedback Score: 0 reviews	this is just a guess, but could you just flip the booster over so the vacuum port is on the proper side? drew, do you know the dimensions of the z32 booster? i was planning on going that route, but if the ABS/auto/JDM booster is close enough, i'm all for it. here it is. z32 - Primary 230mm (9.06in) - Secondary 205mm (8.07in) __________________

12-08-2007, 07:26 PM	#2
garagelu Nissanaholic! Join Date: Aug 2005 Location: Atlanta, GA Age: 40 Posts: 1,856 Trader Rating: (60) Feedback Score: 60 reviews	yes bigger diaphram in the brake booster means better feeling pedal. And yes that will bolt on with no problem.

12-08-2007, 08:41 PM	#4
MadScientist Zilvia.net Advertiser Join Date: Mar 2003 Location: NOLA Age: 48 Posts: 1,972 Trader Rating: (3) Feedback Score: 3 reviews	Yeah the Z32 booster is a squeeze to get in the S-chassis... the JDM S14/S15 Booster is much easier and works just as well. Have fun... and be sure to adjust the plunger. -Drew

12-08-2007, 08:45 PM	#6
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,764 Trader Rating: (5) Feedback Score: 5 reviews	The purpose of the brake booster is to decrease pedal effort. The larger the booster, the easier the pedal effort. I prefer smaller boosters because it's easier to modulate. Look at JDM brake boosters and compare it with the USDM. Then tell me if you still want to bolt it on. Hint: look at the vacuum port.

12-09-2007, 02:10 PM	#9
unicoladron Zilvia Junkie Join Date: Jul 2007 Location: Long Island, NY Age: 40 Posts: 568 Trader Rating: (0) Feedback Score: 0 reviews	^--that is also a pretty good idea. i don't see why you couldn't flip it over, it's just a diaphragm inside, so it probably doesn't matter. but still, i'm just going to run a longer vac line... __________________ 1993 KA24DE for sale with 180k..running when pulled.... need to get rid of ASAP...i'm moving

12-09-2007, 02:41 PM	#10
Jung918 Post Whore! Join Date: Oct 2003 Location: CA Posts: 3,203 Trader Rating: (2) Feedback Score: 2 reviews	or you could get a longer hose __________________ Sale: Hello Kitty Horn Button S14 Rear Valences K.Y. Gordon the Thief (Tony Chen)

12-09-2007, 05:41 PM	#11
cdlong Nissanaholic! Join Date: Jun 2003 Location: Colorado Springs Age: 44 Posts: 1,865 Trader Rating: (0) Rides Gallery: cdlong Feedback Score: 0 reviews	welcome to 3 posts ago. __________________

12-09-2007, 06:12 PM	#12
Skullavera Zilvia FREAK! Join Date: Sep 2005 Location: City of Angels Posts: 1,327 Trader Rating: (1) Rides Gallery: Skullavera Feedback Score: 1 reviews	^^^^^^^^^^^^^^^ __________________ Reviews/Feedback!

12-09-2007, 06:25 PM	#13
MadScientist Zilvia.net Advertiser Join Date: Mar 2003 Location: NOLA Age: 48 Posts: 1,972 Trader Rating: (3) Feedback Score: 3 reviews	Z32 is much larger then the USDM and JDM Boosters (S-Chassis)... Its a bitch to get in because of the diameter... you will be vey very tight against the strut tower while squeezing it in!! You will spend more time adjusting the plunger then getting the the booster though. you have to take the MC off everytime, adjust, replace, test, repeat... -Drew

12-09-2007, 09:13 PM	#15
cdlong Nissanaholic! Join Date: Jun 2003 Location: Colorado Springs Age: 44 Posts: 1,865 Trader Rating: (0) Rides Gallery: cdlong Feedback Score: 0 reviews	thanks drew, didn't know that would be a problem. that suprising though since the z32 primary is the same diameter as the s14 manual booster. maybe the extra thickness with the large diameter is what makes it hard. ABS/auto booster for me. anybody got one? __________________

12-09-2007, 09:24 PM	#16
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	I have a couple I think. PM me. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

12-09-2007, 09:35 PM	#17
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	I run the s13 sr booster because, it was in better shape and easier to get to the 02 sensor. didn't modify anything that i can remember. Probably go back if I go top-mount. __________________ LoverTechnologies "Half Broken Things!"