If you have a Brake Fault it means look at the PFR and see what's wrong, 9/10 times it will be a BSCU Ch1 or 2 fault. Dispatchable.
If you have a Tachometer fault on both channels let's face it it is a Tachometer fault. No dispatch.
Maybe coincidence but if the clown who sent one of our aircraft back with a brake locked out after this exact fault is reading this prepare for a hammering because I have reported you for doing just that.
A new BSCU box has been released that is more sensitive to tachometer faults so those who are not aware be aware of this potential no dispatch condition. The tachometer gives a lot more info to systems other than just autobrake/anti skid. Don't lock the brake out and send it away. Pilots please do not accept.
Rant over