AO Silver Member
Join Date: Nov 2003
Location: United Kingdom
County: Perth and Kinross
Re: Poor 156 Brakes
Regulation 90 was introduced primarily to stop the fitment of low quality and defective pads (some were reputedly made from comressed grass!)
R90 governs friction coefficient, pad compressability, shear strength of the friction material onto its back plate, and thermal stability over a few non arduous brake tests.
The reason some kevlar pads don't pass R90 is that their friction coefficient is too high. For this reason, these pads do too much braking, and if not fitted to the other axle, then, the other axle effectively carries unbraked weight.
It is for consumer protection because consumers, or retailers who may act as advisers to the consumer, are simply too ignorant to realise the saftey implications of mismatched pads.
For this reason, when someone complains of poor brakes, or early locking up, or early ABS intervention of the front brakes, I often suggest to check the rear brakes. Rusty rear discs, siezed rear pads or sticky rear calipers tend to impair the rear brake action to such a degree where overall brake performance is noticeably impaired.- its a much cheaper option than upgrade discs and pads!
Simply, determine if the braking system is in good order first before deciding to modify.
[SIGPIC][/SIGPIC]Drive sideways- life's too short not to
Slip-sliding my way through winter. On four wheels and two.