Which bike?

Any brake will lock up a tire and toss you over the front-end if you squeeze it hard enough. I'm probably wrong, but it seems like "Breaking Power" would be a bit of a hard term to quantify. One might be easier to pull than another. The main advantage of the disc brake in my book is better heat dissipation, lower maintenance, and increased resistance to getting gummed up.

the dDLS brakes on a WRX are way better the the brembo disc set ups on 85/86 models. 87/88 was when they got good. in my opinion the early disc brakes are a complete joke.

NO such animal as a 1986 WRX BIG BILL . WRX was a 1 year only model in 250/400 cc.

The DLS front brake on my 85/WR400 when setup correctly and with a tiny mod is way better than the brembo disc setup that was on my 86/WR240.
I changed the 86 to a 87 left leg , twin spot caliper and Honda disc and now it stops.
Don't know how people rode them so fast when they wouldn't stop.
My 78/PE250 was way worse though.

Same seller different bike but what is it ?

85-86 bike...just has a desert tank on.

86 is my guess. XC on the swingarm and front disc.

has a transplanted front end

Wonder how much that tank holds

True, does have the WP forks.

Don't see that type of tank here in Australia not even the bigger 85/86 WR one.

Tank was made by Acerbis, 4.5 gallon. Husky Products also made a kit so it would fit on the 1981-84 bikes

welcome back stranger!