Thanks for the responses.. very appreciated.
I may have sorted it out... my main concern was that in the RTO situation, why isn't there a penalty along the theme with Thrust Reverser inop, antiskid inop etc etc...
I think the acft are certified without the use of autobrake ie max manual braking, no Thrust Reversers etc in the RTO certification process.....
I'm just going now to look it all up, but if anyone could throw some info this way.. that'd be great..
thanks for the good discussion