Jump to content
SAU Community

Recommended Posts

the other night i took the car out for a spin. after a while,  i noticed the brake peddle was super stiff and i was hearing a clicking sound from the brakes when i was stopped. when i started to drive, it felt like the calipers were engaged and it smelled like pads, so i am assuming the pads were engaged. 

this is on an r33 gtr. does the power steering system provide the vacuum for the brakes? does this sound familiar to anyone?

 

thanks in advance. 

Sticky caliper pistons?

Booster has nothing to do with binding brakes

Might need a rebuild, maybe?

Have a look at the discs, you should be able to tell which caliper is sticking 

If one is sticking, rebuild them all

Youtube is your friend for how to rebuild them

Or, your handbrake cable is to tight and needs adjusting or hung up on something, pull the wheels and find which brake is binding

  • Like 1

You can check to see if the sticking is from (rear) calipers or from the handbrake fairly easily. If you pull the springs and pins out of the calipers, you should be able to (gently) lever the pads enough to push the pistons back just enough that you can move the pad up and out of the caliper. If you can create any movement at all, then that pad/piston is not the cause of the problem. If it is stuck enough that you cannot move it, then it is.

If none of the pads are the problem, then it is far more likely to be the handbrake shoes. And then you have to do more dismantling to get into those.

  • Like 1
  • 2 months later...

so, this happened again and i pulled off the wheels to take a look. the front driver’s side seems to be stuck and from what i see the lower piston(s) don’t seem to be working properly, based on the amount of dust i am seeing on that lower inner pad. does anyone have any experience with these calipers?

i am assuming that perhaps a piston is not moving smoothly as it should, but i am unable to find any information on how to take these apart to check the pistons. i am assuming the giant size 8 hex heads are the pistons, but wanted to see if anyone had any information on these. i figured i could clean them off and apply brake lube. 

anyone know the torque specs for these? any tips?

IMG_4809.jpeg

IMG_4810.jpeg

IMG_4811.jpeg

IMG_4807.jpeg

IMG_4808.jpeg

IMG_4812.jpeg

Pull the calipers for a rebuild, the full rebuild kits for Project Mu are expensive, or so says Google

You "may" be able to strip them and clean them up, but, you will probably still need new seals

Google says the pistons are steel, so probably rusty

  • Like 1
  • 3 weeks later...
On 11/21/2023 at 11:21 PM, The Bogan said:

Pull the calipers for a rebuild, the full rebuild kits for Project Mu are expensive, or so says Google

You "may" be able to strip them and clean them up, but, you will probably still need new seals

Google says the pistons are steel, so probably rusty

thanks! i ended up calling project mu and they recommended a shop about an hour away from me. when i took the caliper to them, they found that there was a burr in one of the pistons. they smoothed it out, put some high temp lube on all of the pistons, and now the brakes are working great.

 

thanks for pointing me in the right direction!

  • Like 4

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

    • Saruthewhite hasn’t been on our site since November 2016 sorry mate
    • Note when Duncan says that, he means "when you're not using the correct lifting points on the sills, because you want to work on the sills. A 2 post hoist is not appropriate for everything anyway, and working on the sills is a good example of that, because the arms go under ths sills anyway. You're better off finding another way to support the car off the ground. Beyond that everything else D said is correct. Only the dedicated jacking points are the correct place to lift. Anywhere else is incorrect, extra caution and awareness must be used, etc etc.
    • Your off site links didn't work for me, and in any case it is easier for forum members if you post the pic directly either as an attachment or a link so the information is all in one place. That aside, the sills are the correct place to lift the car, whether with the factory jack or a hoist. Yes you should use rubber blocks with a slit for the seam on a hoist to avoid bending the pinch weld (where yours is currently bent, just bend it back if possible eg vicegrips), and be aware of the height you need in the blocks to clear any sill extensions to the hoist arms as it lifts If what you are doing needs access to the sills, the rear subframe bush would also be strong and secure. I'm not sure what you mean by sidemember (maybe same part I mean by sills) but be careful that your front support point is not too far back as the car is very front heavy and could overbalance.
    • Here's my first iteration - white duct tape so color is off, but this is just a straight line across the bonnet lip. From a geometry standpoint, this is probably closest to what a GTR has. Next up is some $5 white pearl vinyl and some rubber door sill trim, applied to the BACK of the bonnet lip. It's more accurate placement to the GTR, but also follows the body lines on this setup a bit more. Couple more pics on this config incoming: Again, a $5 vinyl and rubber job, it's  POC still and not how I'm gonna run this part. But one thing I'll note is that the black trim does need to "straighten out" a bit, and instead of going completely along the line of the bonnet lip, might be better suited to wrap over the "horns" of the bonnet lip, giving it a less aggressive curve up at the ends.  The correct way to do this would be to paint it body-matched and then decide how you want to make the black line. If you used paint or a pinstripe, you could have the black line go straight to the corner of the headlight where the rubber strip typically meets the headlight on a GTR.   Hope this helps!
×
×
  • Create New...