300zx upgraded brakes need help please!!

[david200095367]

i just did the 300zx brake upgrade on my 91 240sx w/abs. i upgraded to the 26mm na calipers and the stock brake lines from the 300zx. i also upgraded to the 300zx 1 1/16 nabco master cylinder. when i went to test drive, the brakes feel like they have a slow response when i hit the brake pedal. i have to pretty much press the brake pedal in all the way for the brakes to hold. does anyone know what can be wrong? also how good are the brakes supposed to be compared to the stock s13 ones? thanks

[SeVa-S13]

Bleed.

[david200095367]

i bled the brakes. i first started off with the one farthest from the master cylinder and bled it till oil started coming out. then i went to the drivers side and did it. i have abs, is there anything extra i have to do? thanks

[crzycav86]

That's correct. Did you bleed the abs unit too? I believe there are two bleeder screws on the top.

Also, make sure you put the calipers on the right side. The bleeder screw on the caliper should be at the top. If they are at the bottom of the calipers, then you need to swap the left and right or else you will always have air in the system.

[Juujai]

check the master cylinder and make sure you fill it up. rebleed all four just to check. then fill check the fluid again and top it off.

i had to bleed twice because i probably messed up somewhere along the lines.

shouldn't stop too much faster than stock 240 brakes. it depends on the pad compound choice, and tires. but you will dissipate heat like a billion times faster than stock but at the sacrifice of brake bias. you can get one of those brake adjusters to fix some of the bias.

[david200095367]

ok so i bleed the abs unit the same way i would bleed the calipers? also Juujai when you say bleed all 4 do you mean both of the front calipers and the 2 from the abs unit? thanks everyone who helped.

david

[Aries]

you will need to bleed all 4 brakes (front and rear) and the ABS unit.My bet is that your rear brakes have air in the lines and are screwing up the system's response.

[david200095367]

ok all four plus the two abs ones right? i only upgraded the fronts so would air have gotten into the rears? thanks

david

[WeldingHank]

you obviously had to take the lines off the stock master cylinder. so of course some air is going to get into the lines for the rears as well.

[david200095367]

ok i will bleed all 4 of the brakes and the abs unit and let you know how it turns out. thanks everyone who helped.

david

[Ramius83]

Also, make sure you just don't bleed it until brake fluid comes out. But make sure you bleed it until PURE brake fluid comes out with zero bubbles. The fluid has bubbles in it will appear white. Keep bleeding until full yellowish brake fluid comes out.

What also may help you, if you have the time to wait for them to come in, is to get yourself some brake speedbleeders. The size is M10x1.0. Those make life so much easier it isn't even funny....

[Juujai]

damn rich people lol. too broke for speed bleeders. just step on the pedal a couple of times and hold it down then find a 2x4 or something to hold the brake pedal down while u open that valve lol.

yeah bleed everything until theres no air left dont just open the valve and close it real quick. brake fluid is not that expensive just waste a little.

[AZhitman]

Make sure the bleeder hose is submerged in clean brake fluid.

Don't try to bleed your brakes alone. Get a helper, anyone who can push the pedal when told will do.

Speedbleeders are cool, but they don't really change the bleeding process.

[Ramius83]

Speedbleeders are cool, but they don't really change the bleeding process.

Except the time, one person job, and ease.......lol.

Yeah, they are mainly just a luxury item. Bleeding is bleeding, regardless, it is all done the same way. I just mentioned them because they are fool proof. Some people think they are doing the "right" way to bleeding brakes, when in reality they are doing it wrong. Speedbleeders are the "Bleeding Brakes for Dummies" way lol........

[david200095367]

i bled all 4 brakes and the 2 abs ones and the pedal feels better, but it still seems kind of a slow response for 4 piston calipers. could it be the lines because i am using the stock 300zx lines. would the stainless steel lines improve the brake response? thanks

david

[Juujai]

stainless braided isn't really necessary, oem are good enough. if your lines are clogged replace em. hmm have you bleed your own brakes before this? if you have then you should know the process. if not then you may have screwed up.

hmm you upgraded to the z's master cylinder then that shouldn't be the problem i'm not sure i gotta see it for myself to diagnosis.
Modified by Juujai at 2:00 AM 5/25/2005

[david200095367]

yea i bled brakes before and know the process. could the brake pads be the problem? thanks