- My model of MX-5 is: NC3.75 2.0
- I’m based near: Hereford
- I’m looking for technical help or recommendations on: Trying to solve an issue with judder under braking that has not been solved by changing discs and pads.
We’re the hubs thoroughly clean before you mounted the new discs?
I had a judder/shake on mine when I first got it - it turned out the slides and pistons were sticking.
Full caliper rebuild, fresh discs and pads sorted it out.
I believe so.
Had a set of discs and pads under warranty and things seemed better for a while but then problem recurred.
Even had the osf hub replaced as there was a binding issue.
Am planning on finding a new garage/specialist for them to take a fresh look.
Thank you
Thanks. Thats interesting.
Anyone recommend a specialist in the SWM region who could take a look?
Cheers
Slider pins.
Mine did exactly the same, new discs and pads cured the issue for a few thousand miles, just enough for the pads to fully bed in and the fault came back.
I chased the fault for a while.
I borrowed a laser thermometer thing and went for a short run with some heavy braking, and found the o/s front was much warmer than the others
One of the front slider pins has a rubber sleeve and it was this rubber sleeve which had swollen.
Not enough to sieize the pins, but enough to cause judder.
Just to prove the theory, I took the rubber sleeve off and refitted the pins, the judder went way.
News pins cost about £12
Great, thanks for all the advice!
If you are reasonably DIY savvy - the slide pins are pretty easy to replace.
These are the ones I used
Thanks for the part info!
If vibration comes back after about 3,000 miles, it usually means the discs were fitted with excessive runout (dirty hubs). The pads kiss the disc on the same high spots on either side with every single rotation and you end up with slightly thinner discs at those two points, giving judder on braking. Then you need to do the job again properly with more new discs and pads.
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Even if you not into DIY, it doesn’t need much in the way of tools to service your own brakes. Often judder just needs the calipers off and clean up the pins the brakes slide on to operate properly. It often needs repeating ever few thousand miles and that’s money saved with little skill needed.
A few miles drive, check the discs, if one is hotter than another it’s probably binding on it pins.
Can you describe the judder in more detail. I have an issue I’m trying to troubleshoot currently that I think may be the same issue.
Did you find it would judder when steering sometimes also?
Hi,
Judder was from the osf corner only under braking… Not particularly felt thru the steering, more generally.
I have since had some work done on the car and I think the problem might be solved.
Both front discs and pads inspected. The inside face of the offside one had a small amount of pitting which couldn’t be removed by sanding the surface.
So replaced both front discs and pads and so far so good.
A couple of obvious questions - why hadn’t the surface pitting been spotted previously and why only on the offside?
It was necessary to inspect really closely to see/feel the pitting.
As for why only the offside. I think it might be caused by where the car was being parked until very recently - the offside close to wall with little sun, well shielded from the wind and quite damp in that moss growing on the edge of the driveway. Also, the car driven for lots of short journeys and likely that brakes not that warm on returning home, so any moisture on the discs and pads would tend to hang around, particularly behind the dust guards on the rear face of the discs - causing the pitting. The near side front is in a more open area with more chance of sun and air circulation…
The car is now garaged stored so I have my fingers crossed that this will prevent the issue from recurring!!!