Sports Black Brake Judder

Hi All,

I’m looking to you good people out there to help me with my '61 plate Sports Black that has developed a brake judder. I have owned the car for the last 8 years and is always garaged and never had any problems. Now, from a cold start after a few miles of use, the juddering starts. It has only done 40,000 miles.

I have replaced front discs, pads and caliper sliders. This did not solve the problem.

I have also just replaced the pipes from calipers to the hard line which also failed to solve it.

Any ideas as I am now at a loss. I really did think that the hose replacement would solve it…

Thank you all in advance

I know on two of my previous cars what I thought was front brake judder turned out to be rear,I didn’t believe the garage convinced it was front related.

1 Like

Thanks, I hadn’t thought of that issue. Thats one for me to investigate further👍

1 Like

What tyres do you have? Have you tried swapping fronts with rears to see if it makes any difference? Having the wheel/tyre combos rebalanced might be worth doing too.

Hi,

I’m running Bridgestone 205 45 R17 which were all replaced last year.

Surely it would judder without braking, if out of balance?

I haven’t tried swapping them about yet.

Are the wheel nuts fully tight?

Yes they are👍🏻

1 Like

Yes, normally when not braking too, but and very mild judder can be accentuated when braking.

Have you checked for any movement in the hub bearing? My next step would be to check for any excessive runout on the discs, even if new. And measure the runout value with the disc in all five possible positions. You’re aiming for no more than 0.1mm. But if the values exceed 0.1mm I would then check for runout on the hub flanges. These are the kinds of things we do routinely on race cars whenever discs are changed.

1 Like

Thanks. Good call.
I haven’t checked the bearings. I’ll get onto that next week.

I did give it a good ragging this afternoon to get some heat into the discs and didn’t get any judder.

You are correct. 0.1mm would give it a big discrepancy.

Sounds promising, although it would seem a bit strange that it might cure itself simply by being given a ragging. Quite often people report “warped discs” when what’s actually happened is that the disc surfaces have become contaminated by pad material transfer (which might happen for example if you keep your foot on the brake pedal when stationary after a high speed braking event), and the cure for this can be to give the brakes a proper beasting ie essentially burn those pad deposits off. But in your case you fitted new pads and discs so that would seem to rule out the pad deposits scenario.