Hissing sound when pressing brake pedal R33

[Tomak]

Hello, 

I have changed lately brake booster (second hand ) and install new braking pump. Bleed the system 5 times. My ABS is disconnected

Every time i press the brake pedal i hear one hiss sound, is that nornal or not? ( its not like a constant air leaking, just one short hiss when press )

When i press the pedal and start the engine i can feel the brake pedal is falling a little bit down. This is the only test i have done so far.

The braking system is not working too well lately, i need to use a lot of force to stop the front wheels at higher speeds around 100km/h.

I heard the braking system is not too good in this cars. What do you recommend to upgrade to improve the braking system? My leg is hurting sometimes from hard braking and i want to track day this car sometimes.

 

 

 

 

[GTSBoy]

9 minutes ago, Tomak said:

I heard the braking system is not too good in this cars.

Not true. They're pretty good.

I would suggest that your 2nd hand booster is no good. Get it rebuilt.

[blind_elk]

If you are having to apply lots of pedal force, try servicing the calipers.

[Tomak]

11 hours ago, GTSBoy said:

Not true. They're pretty good.

I would suggest that your 2nd hand booster is no good. Get it rebuilt.

I have comparision how the braking works in different cars, I daily drive M5 E60 and Peugeot 407 and i am not using force on the pedal almost at all for hard and quick stopping from low speeds. After going back to my Skyline r33 when i use the same amount of force nothing happens.  I need to push pedal really hard to get the same results.  This is why i say the stock brakes are pretty bad in Skylines, or brake booster is too small and not doing the job.

Edited August 9, 2019 by Tomak

[GTSBoy]

If the brake booster is f**ked, as I suggest it is, then that is exactly the consequence you would expect.

[Tomak]

Problem is that i dont know if the brake booster works efficiently. What can i expect from the second hand 20 year old booster?

I did a test yesterday and disconnected brake booster and try to drive my car and the car had no braking power at all. I mean you could berely brake without booster it was so dangerous to drive, the handbrake was much  better without the booster. I guess the booster is working pretty good because the difference is huge.  Question is it working efficiently.

I wish i could purchase the new brake booster. Do you know if this part is available somewhere in Australia, Japan or maybe USA?

The part number i need is 23U11. Its the brake booster from GTS R33 since i have this one after the conversion swap RHD to LHD

It can be also refabricated if you know the source where i can get one.

 

 

Edited August 10, 2019 by Tomak

[KiwiRS4T]

I have never driven a Nissan where you could not engage the ABS without excessive force on the pedal. When people say brakes are not good enough they usually mean that with many rapid applications they lose stopping power. If you have to stand on the brakes to pull the car up normally then there is a fault. Sounds like you were just unlucky with your replacement booster.

Has this problem existed ever since you disabled ABS? Sure all the brake lines are connected properly?

BTW almost any booster should do.

e.g. https://www.trademe.co.nz/motors/car-parts-accessories/nissan/brakes/listing-2262431068.htm?rsqid=84e0244abd7f4ea2aea053cf26cb1d59-001

 

[GTSBoy]

12 hours ago, Tomak said:

It can be also refabricated if you know the source where i can get one.

Take it** to a brake workshop. Give it to them with a small handful of money (like, <$200 worth) and wait a couple of days. Presto, rebuildo.

** The booster.