Last Friday two of my players decided to bust through a concrete wall. First the large character with 10d body and heavy armor tried, and when he failed, the second player decided to drive a Ford F350 through the wall. Both players were OK with the idea that they might hurt themselves as much as they hurt the wall. Regardless of whether or not this can be done in real life it seems like a neat thing to have happen and so we set to working out the mechanics. 

The impact rules were written more with an eye toward what happens to your character when he slams into a wall (or when somethingwall-sized, like a car, slams into him) than what happens to the wall itself.

So my first piece of advice would be: Wing it. It sounds to me like a guy who can bench press a tractor should be able to get through a brick wall, so let him knock through it. Don't worry about the math.

But if you definitely want a more, er, concrete set of rules, let's see. For a character trying to muscle through a barrier, you could just say he automatically breaks through his Body dice in damage -- whatever kind of damage his Body stat inflicts. With 10 dice in Body you do width in Shock and Killing, so you can do 10 Shock and Killing to a barrier. No need to roll, because the wall is just sitting there waiting for you to clobber it. Add Deadly and Penetration as appropriate. Maybe give him width in bonus damage if he succeeds at a Brawling check, so Joe Normal can kick down an ordinary door or the Hyperbody guy can kick down a bank vault.

For a car (or tyrannousaurus, or Darko the Amazingly Dense Man, or whatever) trying to slam through a wall, use the Throwing Large Objects rule: Each point of HAR the big thing has counts as a point of Penetration against the target. So if your player's Ford has HAR 3, that's 3 Penetration on top of the impact damage. At 32 mph, it does 5 Killing with Penetration 3, which is enough to break through two or three feet of concrete. (Hope he was wearing his seat belt.) 

A good rule to add is the Ablative flaw from Heavy Armour (page 96 of WT) for its HAR. It makes subsequent attempts to ram a wall more likely to succeed, and makes sense that the wall would be weakened and easier to break through or collapse.