Jump to content
SAU Community

Recommended Posts

Who here runs brake air ducting onto the rear brakes of an R33 (GTST in my case)?

My question is mainly how have you done it and where have you sourced the air from?

My last trackday was ended early by my rear passenger side caliper falling apart due to excessive heat, so I need to run some sort of ducting to try to cool them down.

I have 400R side skirts (from Jetspeed) on my car, with holes just behind the door. Now I assume this is for brake ducting but does anyone know for sure whether air flows into these? (Not around? They are Jetspeed knock-offs)

If air does flow into there, I guess that would be the best place to run it from because the air is going to still be cool and not carrying heat from the engine. (Alternative being running ducts from under the car, which I assume would grab a lot of heat off the bottom of the engine / exhaust).

Attached is a picture of the car + side skirts for reference

p6230088go2.jpg

Link to comment
https://www.sau.com.au/forums/topic/186547-r33-rear-brake-ducting/
Share on other sites

Interesting....How do you know the caliper fell apart due to exessive heat? The only reason I ask is the the rear brakes do sweet FA in relation to the fronts and would be surprised if that was the cause.

No one I know uses rear brake ducts even on some very powerful GTR's in the state but I'd say your best course of action would be to run some simple tubing underneath the car directing air flow onto the rear brakes.

Alright, fair enough, I guessed at it being because of heat. I think I was on my 7th hard lap and the pedal let go all of a sudden and I shot off into the paddock.

By fell apart I mean (and this is what I'm guessing happened),

The pad locking mechanism broke (that was the part I assumed was from heat)

The pads came out one at a time,

The piston seal broke

Brake fluid started running onto the disc and caught fire

And I made it back into the pits with a nice flame coming off my disc (quite hard to put out too).

The pads i did myself a few days beforehand, put new Ferodo DS2500s on all four corners. The pins were definitely put back, as I remember inspecting them at the time and thinking they should have been a lot thicker.

Those pins I think are a bad design, but it was no better or worse than the other pin which held up. (For reference, they wouldn't be thicker than your average paper clip).

It's all fixed up now, I just want to make sure a similiar thing doesn't happen when I go back again (because it is mighty hard getting a car without a brake pedal home when it's over 3 hours a way and you don't have a tow car or trailer).

The pads i did myself a few days beforehand, put new Ferodo DS2500s on all four corners. The pins were definitely put back, as I remember inspecting them at the time and thinking they should have been a lot thicker.

Those pins I think are a bad design, but it was no better or worse than the other pin which held up. (For reference, they wouldn't be thicker than your average paper clip).

It's all fixed up now, I just want to make sure a similiar thing doesn't happen when I go back again (because it is mighty hard getting a car without a brake pedal home when it's over 3 hours a way and you don't have a tow car or trailer).

Simple piping for rear brake cooling

post-28646-1190698567_thumb.jpg

I'd suggest you use split pins as retainers instead of the flimsy looking spring thing

I'm looking into a better way to lock the pads in at the moment, individual split pins may be the answer, but the holes on the "bolts" that they get put through are very small - I'll post up a picture of what I've done with it when it's sorted out.

The Gibson GTR's used ducts similar to what tacker posted but they were left simply either side of the tail shaft and straight.

As Roy and the boy's have said,,,you have made a mistake on the install. Consider yourself a lucky little vegemite,,,It could have been a lot worse.

As for those stupid feeble clips,,,I have often thought about changing them and my prefered method would to tie-wire them together (like you would do to sump plugs ect),,,not too tight though as you don't want to start pulling the pins together and making them jamb up against the pads. My sports sedan has been running this method for ages and Duncan's GTR will be getting this as well as Dan's drift car.

Neil.

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

    • Sorry to hear your HFM BM57 was faulty,  did you contact HFM I would hope they would be at least grateful for the information if there was some sort of manufacturing fault, you would hope they would be sympathetic even if your item was 2 years old if it had never been fitted. May I ask where it leaked from ?
    • Cats are called Bella, and Donna...  Like that poisonous plant And I remember your 2 monsters, I remember making a little bit of wee when you let them out... LOL I have already installed cat doors into the laundry where their kitty litter is, and the sun room, apart from the cat doors there's not going to be any permanent mounted stuff on the interior walls (interior doors are cheap and easy to replace) I will get a outdoor cat cage thingie once I finish the landscaping out back... https://catnip.com.au/ The only off limit areas are the main bedroom and the gym room....but, currently the cats are curled up in bed, in the main bedroom with the Mrs.....LOL, the off limits for the kittens to the main bedroom lasted about 5 minutes with Jackie I currently only have 1 free standing huge cat tree multiple level scratching post thingie in the lounge room, but, I will be getting another one soon now that I'm happy with the furniture layout in the back room and have a perfect spot for it  
    • All of this is making it seem clear that running the Coppermix twin was definitely the way to go, especially in hindsight with how insane tariffs have gotten and the strength of the USD vs yen at the time.
    • That sounds like no chance of even importing one for road registering then Now I see why Duncan wants to check LHD rules for Targa...   I wonder how "bolt in" the AWD would be if you got one imported from the US and swapped it to an AUD one
    • Not to mention they drive like a bucket of bolts! yuck!
×
×
  • Create New...