Jump to content
SAU Community

Mystery Brake Problem After Engine Rebuild

manage13
 Share

Recommended Posts

manage13 Proficient

manage13

Posted
Posted

Mystery brake problem- R32 GTR

Hi everyone, I have had some issues with my brakes that not even my family mechanic can solve (he knows his V8’s however his knowledge with jap turbo engine is scarce).

The problem I’m having is that my brakes are not feeling the same as they once were before my engine build. Basically the brakes feel as if one was to drive a car and switch off the ignition and try and brake. That same feel I have constantly.

I checked the vacuum at the brake booster (where the one way vale is) and if feels as if there is not enough vacuum. On my boost gauge at idle reads 5 psi on the vacuum side.

Does anyone have the slightest idea as to what my problem is? Any help will be greatly appreciated.

Thanking everyone in advance.

ebola Proficient

ebola

Posted
Posted
what dose it mean when u take the hose off the booster and your brake pedel feels like it should coz i got a spongy pendel but when i pull the hose off the booster the pedal feels great

Sure, it "feels" like it should.

I lost vaccuum on my brake booster in my magna once. The brakes "felt" alot harder - much like I am sure yours do.

The problem (!) is that you still have the same amount of braking for the same amount of pedal throws - its just alot harder to get the pedal down that far.

Also, brakes are brakes. They all work on the same principle (regenerative braking aside - but you don't own a hybrid, right?). Stand brake advice applies.

(I'm not a mechanic, so.... advice from here on is... opinion only. I have lots of opinions.)

bleed first.

Then check all cylinders.

take it to a brakes specialist.

--ebola

blind_elk Grand Master

blind_elk

Posted
Posted

You have a permanently "heavy" pedal, is that your problem?

Here's a dumb thought - is it possible to put the hose on "arse-about"? Maybe the valve is facing the wrong way. Or the valve is cactus.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Murray_Calavera
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By Murray_Calavera · Posted

      @joshuaho96 Hmm considering the drama you've seen/experienced, have you looked into getting a built complete long motor shipped from Australia?  Considering the AUD is basically monopoly money when compared to the USD, at a glance this seems like a good option?
    • Shoota_77
      R32 GTS-t RB30 sedan

      By Shoota_77 · Posted

      Bloody Skylines, they put you through the bloody wringer! Stick at it! Stunning drag strip BTW! Where is it? Can see part of the name on the slip and probably should just Google it!
    • joshuaho96
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By joshuaho96 · Posted

      I mean the other day I had to walk someone through diagnosing why their timing belt was walking off the cam gears. At least one of the issues was a bent tensioner stud. Local mechanics have found runout on the CAS mechanism causing weird failures. I'm also no saint here I've documented some of the things I've had to learn the hard way. Something I discovered recently is that my CA emissions catalytic converters weren't even welded correctly to align the downpipe to the main cat and they tossed the support bracket that goes from the transfer case to the downpipe to support everything there. I spend a lot of time chasing down these decidedly unsexy problems and the net effect is it feels like I never actually get to the original objective (flex fuel, VCAM, oil control, cooling, etc).
    • r32-25t
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By r32-25t · Posted

      At times with how you make everything sound, all I imagine Americans doing when they see a gtr is standing there looking at it and bashing it with a gun like how a caveman would with a club and hoping it fixes itself 
    • joshuaho96
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By joshuaho96 · Posted

      I think this is just a product of how the US market works for this stuff. Shops are expensive and there's no real way of knowing what kind of results you're going to get, people don't really have the institutional knowledge. I have heard too much at this point to really put faith in anybody "full service" except maybe DSport and they aren't really a full service kind of shop. If you go to the right place I have no doubt they'll get it right for you. Some locals have set it up right but the cost really is nuts and even now they're still fighting issues. And you know I'm a crazy person who thinks things like twin scroll, relatively short low-mount cast headers, PCV recirc to intake, recirculating BOV, right-sized for ~400 whp, MAF load, validating all of that to a standard comparable to OEM test programs, etc are relevant. For what it's worth, multiple local owners at this point have been stuck in a perpetual cycle of blowing a motor -> getting someone to rebuild it -> some missed detail causes the bearings to wipe and spin just outside of break-in mileage or drop valves or some other catastrophe -> cycle repeats. I usually only find out about this because I'm perpetually helping random friends with diagnosing car troubles, Skyline or otherwise. The single turbo stuff if I'm honest is mostly secondary, it just doesn't seem to achieve the numbers in the ~2000-3000 rpm region that I would expect given the results I've seen here or in Motive's videos. I don't really know what we're missing here in the US to be causing this. Lots of people like to emphasize the necessity of finishing the project first and foremost, but I'm not made of money and I can't afford to be trashing a 15k+ USD engine build with any regularity. Or spending my relatively limited garage time these days unable to triangulate problems because too much was changed all at once. Also, even if it isn't a catastrophic failure I would consider spending the cost of single turbo conversion with nothing to show for it to be pretty bad. 
×
×
  • Create New...