hello people.

when braking both light and heavily at speeds above 60 mph the steering wheel juders violently however no vibration is felt through the brake pedal. normally i would simply diagnose this as warped discs but ive just fitted new brakes and am concerned. admittedly the dics are second hand however they showed little use with a minimal wear lip. its also wierd to me that nothing at all is felt below 60mph even when stomping on the brakes.

is it simpy that the discs are warped and that above 60mph the vibration is close to resonance.

ive just fitted cosworth 2wd front brakes to my standard sierra sapphire. i had to modify the hub by removing 1.5 mm from the mounting lugs and 4 mm from the caliper. this ensured the caliper was centralised over the disc. i then tapped the holes to m12. could something ive done be caulsing the problem.

cheers

 

Is there any rust on the discs still ?, this will cause it, otherwise check the wheel bearings, had this myself after the same conversion, but that was on seperate bells/discs.
tabetha

 

Hello tabetha

I actually read a few posts of yours when looking into the conversion. They where extremely helpful thank you!

I don't have many tools on me at the min as I'm not at home. The discs are rust free. I'll check the wheel bearings today. But I'm doubtful that will b the issue as the car just passed an mot on Tuesday. From what I've been reading on the Internet I think the problem might be that I've been in too much of a rush to test my new brake set-up and haven't bedded them in properly, thus causing pad material to transfer unevenly to the disc. I'll check what u suggested tho too!

Thank you for the input! Just out off interest what caused you to have the same problem?

Cheers

Luke

 

On mine it was run out on the actual hub flange where the disc fits, got 3 thou run out, so by the time it was at the edge of the much larger disc it was silly amount, had the flanges skimmed, end of problem, asked the guy doing it if they could do things this big, he laughed and said we can do up to 6 METRES diameter, they do mainly food industry machines!!
I also had run out that was machined in by hi spec, due to them being as accurate and truthful as a politician!!
tabetha