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More brake pain - aaaaarrgggghhh!!!
Poorscousertommy - 24/6/13 at 07:51 PM

Hey folks. Looks like i'll be building this car one post at a time

So finally figured out how brakes work.. And then I ran into this issue:



The disc isnt yet bolted on, but I've swung on the hub nuts to be sure the hub and carrier are as tight as can be.

There isnt any learance between the disc and the inside of the carrier, they arent quite rubbing, but I'm sure the disc should be more central.

Any clues here? The calipers, mounts and disc all supplied by MK, so dont think thats the issue. Any cleas as to what I need to check? Note that both sides are the same so dont think its an assembly offset issue.

Any help would be appreciated. Also, I dont have a washer between the MK hub mounting bracket and the caliper mounting bracket.

Thanks as ever for the help.

Mark


mr T - 24/6/13 at 08:05 PM

move it over with washers
tony


StrikerChris - 24/6/13 at 08:42 PM

Im not sure I'd be happy moving things on brakes about with washers to be honest.something isnt sat how its designed to work, and id not bodge brakes despite some rather agricultural fixes ive done to cars of my own in the past.cant help you with your problem im afraid tho.just my opinion, hope you find a solution.

Chris


Sloan85 - 24/6/13 at 08:49 PM

Might be the perspective but the disc doesn't look parallel to the mk caliper bracket?


britishtrident - 24/6/13 at 08:50 PM

Shim it out --- ie use washers. normal engineering practice not a bodge.


corrado vr6 - 24/6/13 at 09:07 PM

My front brakes needed spacers from memory


Norfolkluegojnr - 24/6/13 at 09:07 PM

Third vote on washers. Had to do similar previously.


theprisioner - 24/6/13 at 09:32 PM

Washers as long as it is a few mm is ok. The big issue is the pads must be parallel to the disk otherwise the brake effectiveness will be crap until the pads wear down, not a good idea.


ReMan - 24/6/13 at 10:07 PM

Is this front or rear and which callipers/discs are these
No expert , but I remember from my build there are a choice of discs with different size/ offset


Poorscousertommy - 24/6/13 at 10:52 PM

thanks folks, didn't fancy shimming myself for the same reason.

if it was only one side I'd be happier it was a build issue, but with it being both I figure its down to chassis tolerances - I can't see MK giving me the wrong bits???

I'll rebuild anyway, can't be more than an hours work, and if all else fails its going to be a washer job.

oh - and they are rears if that helps!

thanks again!

[Edited on 24/6/13 by Poorscousertommy]


benchmark51 - 25/6/13 at 07:23 AM

The picture isn't too clear and not enough of them. I would say that the parts are incompatible. I would definitly NOT mess about with washers.


pmc_3 - 25/6/13 at 07:37 AM

The disc looks too thick to me? even centralised i'm not sure you would get the pads in


Daddylonglegs - 25/6/13 at 08:46 AM

Wot ^^^^^ he said


britishtrident - 25/6/13 at 11:46 AM

quote:
Originally posted by pmc_3
The disc looks too thick to me? even centralised i'm not sure you would get the pads in


Eh?



The disc thickness must be a close fit to the slot in calliper bracket -- if the calliper bracket fits over the disc with a minimum running clearance all is well.
The reason being that the gap between the calliper bracket and the disc must be close enough to prevent a pad completely worn down to the metal slipping between the calliper carrier and the disc ---- yes this actually happens in real life if the pad is down to the metal and disc are very badly worn.

The thickness of metal backing plate on a typical brake is no more than than 4mm, so to prevent the pad pooping out in the worst case scenario (worn disc & worn out pad) a 0.75mm to 1.5mm clearance on each side of a new disc is about right.


britishtrident - 25/6/13 at 12:06 PM

quote:
Originally posted by StrikerChris
Im not sure I'd be happy moving things on brakes about with washers to be honest.something isnt sat how its designed to work, and id not bodge brakes despite some rather agricultural fixes ive done to cars of my own in the past.cant help you with your problem im afraid tho.just my opinion, hope you find a solution.

Chris


Somehow "designed" and kit car brakes are not concepts that go together very often. It is a collection of parts adapted to bolt together.