braking issues

[nismoWhore]

95 s14 with z32 fronts and SS lines, rear is stock stuff......after i drive the car 30 mins the brake pedal feel gets mushy....when the car is cold the pedal feel is fine..... replaced the master cylnder...any suggestions, ideas ? :-/

[aznpoopy]

check for leaks

is your master cylinder cooking?

[nismoWhore]

check for leaks

is your master cylinder cooking?

cooking? fluid level hasnt changed so i think its ok on the leaks

[cgguy]

What kind of brake fluid are you running? Sounds like it might be fluid fade. If you're not using the right DOT brake fluid or if it's old and tainted with water you'll feel fade in the pedel after it heats up (and boils).

[aznpoopy]

cooking? fluid level hasnt changed so i think its ok on the leaks

ka-t
sr20det

turbo by m/c and no heatshiled will cook the m/c

[nismoWhore]

no turbo ....car is only 3 months old to me.....so do i need to bleed the whole system completely?

[aznpoopy]

that would be a good start.

technically it should be done anyway if you just got the car. who knows how long that stuff has been in there.

[xtreme_s14]

What kind of brake fluid are you running? Sounds like it might be fluid fade. If you're not using the right DOT brake fluid or if it's old and tainted with water you'll feel fade in the pedel after it heats up (and boils).

sorry to thread hijack.. so you have to take into consideration what type of fluid you're using according to the vehicle? i'm using Super Blue Racing Brake Fluid in my non-ABS S14 w/ Z32 front calipers and stock rears.. PM me for answers! thanks!

[shayrgob240]

sorry to thread hijack.. so you have to take into consideration what type of fluid you're using according to the vehicle? i'm using Super Blue Racing Brake Fluid in my non-ABS S14 w/ Z32 front calipers and stock rears.. PM me for answers! thanks!

Yes, some cars require a higher brake fluid boiling point than others. That is why tehre is Dot 3, 4, 5, 5.1, etc. Eeah one has it's own characteristics (dry and wet boiling points).

So the only real difference between them is boiling point. I understand that some are silicone based but not many cars call for those. If you are using a glycol based high performance brake fluid for your car, then you are golden.

Back to the original poster, I definatley recommend you bleed out your fluid and exchange it w/ new fluid. Unfortunately brake fluid is hygroscopic (water absorbing) so you have to change it every couple of years. Well, why is water bad if it gets into the brake fluid? well, it lowers the boiling point, thus your pedal feeling mushy after driving for a while. What happens is that the brake fluid boils, which creates air pockets which compress. And when that happens, your pedal goes to the floor. So start off w/ that and let us know what happens.

[nismoWhore]

sweet thanks for the info guys you have been very hepful....i let you know how she turns out.....and agian thank you very much