need help and suggestions

[caprifan]

please bare with me its a long one (oo err misses)

 

...right need suggestions on my braking problems.......before track time at Silverstone had a little steering wheel wobble under braking....after Silverstone I now get violent steering wheel wobble on hard braking

 

Capri 2.8

standard rear drums (new drums, shoe's, cylinders)

mondeo callipers (new reconditioned)

cosworth discs (new RD maxtorq)

mintex pads (standard and brand new)

braided brake lines

master cyl new (12 months old)

new Ford TCA's

new Ford Track Rod ends

new p steering rack

new superflex polys on whole front

new Gaz coilovers

new wheel bearings

new roller top mounts

brake fluid less than 6 months old and premium Ford stuff

tracking done

wheels balanced

 

...thanks for sticking with me..

 

....I assumed I had warped discs...got them off last night, they are not discoloured and I put a metal rule across them and they don't appear to be warped....

 

...I am out of ideas as to what is causing the problem....as you can see everything has been replaced, can a warped disc be really really hard to spot or should it be bloody obvious ????

 

...ANY suggestions welcome...don't want to buy expensive new discs if that isn't the problem..............HELP ME OBI-WAN YOUR MY ONLY HOPE..

[cortinaman]

I don't know much about these things but just a thought:

 

You might need to spin the disk up on a lathe to see if its warped as a straight edge may not show it.

 

Hope this helps.

[Gareth]

Yeah, See if u can get en engineering company to re face them

 

should be a lot cheaper than replacments.

 

That's usually the cause

 

 

If not then I'm screwed

[brettp]

i had that on the capri turned out to be a roll bar bush

[Tom]

are you sure the calipers are true to the disc? i got my hubs re-faced recently whilst replacing the pads discs and bearings to solve the same problem it worked - still not sure what it was though - deffo one of them

[capritech]

Sound like the discs you need a dial gauge and re-fit hubs/discs onto car then with dial gauge carry out a run out check! Did you clean up the hubs before fitting the discs?

[atomic punk]

If you don't have a dial guage put feeler guages between the disc and pad, spinning the disc will show if it is out of true

 

Have the same problem on my Escort, the disc is very fractionally out of true cos the hub is slightly uneven, but braking from 70 is not a pleasant experience!

 

May also want to check your roll bar bushes, and failing that, check the hub nut is sufficiently tight (rocking the wheel top to bottom should show this?)

 

Otherwise I dunno

[Gibson]

well u woulda put alot of heat threw them at silverstone... my vote is warped discs... and yes its King hard too spot

[perry]

whip em off mate , put them against the flatest surface

 

a window ! ( patio windows are great for checking true )

 

unless your house is oldskool and has those crazy windows that were made by hand using sand found on a beach

[marky4]

had that problem on my RS was warped disc's

 

but looking at them and even spinning the wheels there was hardly any rub but they have to be perfect you could get them skimmed

 

good luck

[caprifan]

...thanks all.......my thought is the discs but not had a warped disc before and didn't know how easy to spot.....right down the machine shop then