Jump to content
SAU Community

Recommended Posts

After doing a 5 stud conversion + brake upgrade (r33 gtst brakes) onto my r33 gts I cant get my brake pedal to feel firm. 

The car used to have ABS but everything has been removed including the sensors on the calipers. I have compared my brake setup to another non abs r33 and its exactly the same so theres no reason it shouldn't work. 

Ive already had a mechanic look at it, tried to bleed it, but still no improvement on the brakes. Besides that I have also tried to bleed the brakes and master cylinder using the brake pedal and a hand pump vacuum bleeder. With the car not running, the first 20% of the brake pedal has play, and the last 80% of the brake pedal feeling solid as.

With the car running, is literally the opposite, 80% of the brake pedal is useless and the last 20% is when the brakes stop the car although i haven't tested it at speed higher than 30km/h. 
Theres no leaks, every connection is tight, fresh brake fluid etc. The brake booster is also from a turbo r33 to match the turbo gtst brakes. 

Could the master cylinder be broken? is there a way to test if it is? the brake booster and master cylinder both worked before installing them. 

I read on a forum from someone who did the same brake upgrade, same car, and had to upgrade to brake booster and master cylinder cause the brake pedal always felt soft/spongy. But there was no information on the upgrades he made? 
Any help would be appreciated! 

Tbh I was told this is a normal and that stock brakes are crappy??? As you said, there's no feel at the start and all of a sudden everything happens in last bit. Mines a non turbo with 5 stud conversion also.

 

A few people recommended getting a brake stopper which I'm considering trying and plus they're quite cheap. It fits in the engine bay and say it stops the flex in the firewall when braking. Makes the brakes feel stronger (more bite) and has better feel in pedal.

Edited by ossy

My last 33 brakes felt a lot more firmer tho but that was with stock non turbo brakes, I just can’t understand that upgrading to gtst brakes would leave my pedal feeling so soft? Surely it can’t be normal? Having brakes that don’t work until the last 20% just doesn’t feel safe or reliable aha. 

And yea the master cylinder brace I seen that the other day they’re only like $50. But like you said it will only help with stopping the fire wall from Flexing. It won’t improve the 80% of the pedal that doesn’t do anything :(

The gtst master looks pretty identical to the gts master. But I couldn’t use it because it only uses two brakes lines, and I need three.

No experience with brakes so I’m not too sure what you mean, although I read something saying that since the gtst brakes are bigger it requires more brake fluid to work resulting in a softer pedal. If that’s what you mean by the calipers piston area difference? I thought brakes just relied on pressure which means having bigger brakes really shouldnt affect it But I’m not really sure so yeah..

Bore size is like gearing. Small bore means more pedal travel with less resistance. A bigger bore will mean less travel but harder pedal. The biggest stocker is the GTR BM57 but something close to that will help. Also steel braided brake lines will help.

Here’s a another lesson for the day, you won’t learn anything if you don’t try :) I ain’t gonna apologise for giving something a go. Like I said, I even got a mechanic (someone who knows what they’re doing) to try and sort it out. So chill bro 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Yea - I mean I've seen my fuel pump which is decades old and uh, while I'm not saying this with real knowledge... but I sure get the ick at using anything in the fuel system that produced the state of that pump. Many years ago I went through multiple pumps (and strainers) before I dropped the tank to clean it out with extreme violence. I'm talking the car would do maybe 50km before coming to a halt, which resulted in me cleaning out the filter with some brake cleaner and going on my way. None of my stuff ever looked like what came out of your fuel tank. I don't think I'd be happy with it unless every single component was replaced (or at least checked/cleaned/confirmed to be clean here).
    • I'm not going to recommend an EBC pad. I don't like them. Just about anything else would suit me better. I've been using Intima pads for a while now.
    • Agreed, and in particular the earth strap that should go from the subframe to the chassis but it often broken or left off. There is a section in the R32 workshop manual you can follow for troubleshooting if you don't see anything suspicious, and depending where you are (there is no location on your user profile) you should be able to get your hands on a second hand replacement unit still if needed
    • Yeah they mention as a R34 for 2.5 Turbo...but then again thos "small" were also for R34 by that different site. But i look into it and that 310mm EBC is for R34 GTT. And by those you linked the specs are the same 🙂    EDIT: I found these on one site here: DBA 4000 series T3 DBA42304S They are 310mm...and it says are for R34GTT...are there good? EDIT2: ok they have pads too.  What "color" should i get for street use? I dont want/need some noisy ones...(and if they are not that dusty that is good too)
    • Yeah, shame. Maybe  driver's carpet is available 🙏. I am waiting for both amayama and nangun to confirm.
×
×
  • Create New...