Braking issues

[Andy GM]

Hi guys ,, just had my Z3 3.0 out (early finish from work and the sun was shining) ,, after around 10-15 mins of driving I came to a junction and the brake pedal (best way I can describe it) started juddering and making a sort of crunching sound ,, I stopped and checked the pads +discs although I knew it wasn’t these as I’ve had it in bits and renewed these less than 1000 miles ago ,, first time it’s done it and it only did it once ,, just wonder if any of you have come across this before ? ,, thanks in advance for any advice

 

[t-tony]

Did the ABS light flicker when it was juddering? Sounds like the ABS kicked in for some reason?

Tony.

 

[Ianmc]

Likely picked up a stone.

 

[Andy GM]

That’s the thing Tony ,, no the ABS light didnt come on or flicker (although the sensation definitely felt ABS related )

 

[Andy GM]

Likely picked up a stone.

Hopefully that was all

 

[DrWong]

Similar happened to me couple weeks ago. Went past building site, lots of debris about, started making a godawful noise as car came to a full stop. Mine was more of a metal on metal sound though and no change to brake pedal.

Took all four wheels off, nothing obvious, put them back on and noise was gone. Can only assume a small bit of metal got lodged somewhere underneath temporarily. It sounded horrific though

 

[Andy GM]

Similar happened to me couple weeks ago. Went past building site, lots of debris about, started making a godawful noise as car came to a full stop. Mine was more of a metal on metal sound though and no change to brake pedal.

Took all four wheels off, nothing obvious, put them back on and noise was gone. Can only assume a small bit of metal got lodged somewhere underneath temporarily. It sounded horrific though

Il have mine in bits again over the weekend just to make sure

 

[137699]

Check the condition of the ABS reluctor rings. They may be split/corroded (or need cleaning up)

 

[Andy GM]

I will have a look tomorrow when I strip the brakes down , thanks for the advice

 

[mrscalex]

Did the caliper steady springs all go back on securely?

 

[Andy GM]

Did the caliper steady springs all go back on securely?

Yes I replaced all the springs and slides (it’s also had 2 new brand callipers on the front )

 

[t-tony]

If it was something such as a piece of road grit which had got into the calliper you will see score marks on the disc.

Tony.

 

[Andy GM]

If it was something such as a piece of road grit which had got into the calliper you will see score marks on the disc.

Tony.

Clean as a whistle Tony ,, got the back brakes to strip now as one of the backing plates has corroded so il be putting new ones on this afternoon

 

[t-tony]

Rear backplates not straight forward to change, in case you didn't know.

Tony.

 

[Andy GM]

Rear backplates not straight forward to change, in case you didn't know.

Tony.

Was wondering about that ,, il have a look and assess it before I strip it too far

 

[mrscalex]

You'll need to cut through the backplate to wrap it around. Otherwise it's a big old job pulling the hub.

 

[t-tony]

I have seen many backplates where they were in good condition apart from the hold down pin holes had corroded out. This you can repair using nuts and bolts.

Tony.

 

[mrscalex]

I have seen many backplates where they were in good condition apart from the hold down pin holes had corroded out. This you can repair using nuts and bolts.

Tony.

Done exactly that on various occasions as a result of your original advice on the forum several years ago.

 

[Andy GM]

I have seen many backplates where they were in good condition apart from the hold down pin holes had corroded out. This you can repair using nuts and bolts.

Tony.

It’s funny you should say that ,, I did strip them down as one of the retaining pins had popped through the hole so I did put a small bolt with a washer and the spring then put a washer and a lock-nut on the back ,, it does seem to have worked so maybe il leave it like that and see how it goes for now ,, thanks again for the advice and tips

 

[Andy GM]

You'll need to cut through the backplate to wrap it around. Otherwise it's a big old job pulling the hub.

Yeah it does seem quite a sizeable task ,, i didn’t want to bodge it but if cutting a little bit of the metal away saves pulling the hub off then I’m ok with that